Merge origin/development into communication_v2
Realign communication_v2 with the latest development (10 commits, including the
GMRES refactor and the stopping-criterion change), keeping the communication_v2
work intact.
Conflict resolution:
- base/modules/Makefile (veryclean): keep communication_v2's '/bin/rm -f *.h'.
- linsolve/impl/psb_{c,d,s,z}rgmres.f90: keep development's variable
declaration (itmax_, naux), consistent with development's refactored GMRES
body which references itmax_.
communication_v2
Stack-1
3 days ago
commit
7d4354feac
@ -0,0 +1,511 @@
|
||||
!
|
||||
! Parallel Sparse BLAS version 3.5
|
||||
! (C) Copyright 2006-2018
|
||||
! Salvatore Filippone
|
||||
! Alfredo Buttari
|
||||
!
|
||||
! Redistribution and use in source and binary forms, with or without
|
||||
! modification, are permitted provided that the following conditions
|
||||
! are met:
|
||||
! 1. Redistributions of source code must retain the above copyright
|
||||
! notice, this list of conditions and the following disclaimer.
|
||||
! 2. Redistributions in binary form must reproduce the above copyright
|
||||
! notice, this list of conditions, and the following disclaimer in the
|
||||
! documentation and/or other materials provided with the distribution.
|
||||
! 3. The name of the PSBLAS group or the names of its contributors may
|
||||
! not be used to endorse or promote products derived from this
|
||||
! software without specific prior written permission.
|
||||
!
|
||||
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||||
! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
|
||||
! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
! POSSIBILITY OF SUCH DAMAGE.
|
||||
!
|
||||
!
|
||||
! File: psb_cminres.f90
|
||||
! CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
|
||||
! C C
|
||||
! C References: C
|
||||
! C [1] Duff, I., Marrone, M., Radicati, G., and Vittoli, C. C
|
||||
! C Level 3 basic linear algebra subprograms for sparse C
|
||||
! C matrices: a user level interface C
|
||||
! C ACM Trans. Math. Softw., 23(3), 379-401, 1997. C
|
||||
! C C
|
||||
! C C
|
||||
! C [2] S. Filippone, M. Colajanni C
|
||||
! C PSBLAS: A library for parallel linear algebra C
|
||||
! C computation on sparse matrices C
|
||||
! C ACM Trans. on Math. Softw., 26(4), 527-550, Dec. 2000. C
|
||||
! C C
|
||||
! C [3] M. Arioli, I. Duff, M. Ruiz C
|
||||
! C Stopping criteria for iterative solvers C
|
||||
! C SIAM J. Matrix Anal. Appl., Vol. 13, pp. 138-144, 1992 C
|
||||
! C C
|
||||
! C C
|
||||
! C [4] R. Barrett et al C
|
||||
! C Templates for the solution of linear systems C
|
||||
! C SIAM, 1993
|
||||
! C C
|
||||
! C C
|
||||
! CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
|
||||
! File: psb_cminres.f90
|
||||
!
|
||||
! Subroutine: psb_cminres
|
||||
! This subroutine implements the MINRES method.
|
||||
!
|
||||
!
|
||||
! Arguments:
|
||||
!
|
||||
! a - type(psb_cspmat_type) Input: sparse matrix containing A.
|
||||
! prec - class(psb_cprec_type) Input: preconditioner
|
||||
! b(:) - complex Input: vector containing the
|
||||
! right hand side B
|
||||
! x(:) - complex Input/Output: vector containing the
|
||||
! initial guess and final solution X.
|
||||
! eps - real Input: Stopping tolerance; the iteration is
|
||||
! stopped when the error estimate |err| <= eps
|
||||
! desc_a - type(psb_desc_type). Input: The communication descriptor.
|
||||
! info - integer. Output: Return code
|
||||
!
|
||||
! itmax - integer(optional) Input: maximum number of iterations to be
|
||||
! performed.
|
||||
! iter - integer(optional) Output: how many iterations have been
|
||||
! performed.
|
||||
! performed.
|
||||
! err - real (optional) Output: error estimate on exit. If the
|
||||
! denominator of the estimate is exactly
|
||||
! 0, it is changed into 1.
|
||||
! itrace - integer(optional) Input: print an informational message
|
||||
! with the error estimate every itrace
|
||||
! iterations
|
||||
! istop - integer(optional) Input: stopping criterion, or how
|
||||
! to estimate the error.
|
||||
! 1: err = |r|/(|a||x|+|b|); here the iteration is
|
||||
! stopped when |r| <= eps * (|a||x|+|b|)
|
||||
! 2: err = |r|/|b|; here the iteration is
|
||||
! stopped when |r| <= eps * |b|
|
||||
! where r is the (preconditioned, recursive
|
||||
! estimate of) residual.
|
||||
!
|
||||
!
|
||||
subroutine psb_cminres_vect(a,prec,b,x,eps,desc_a,info,&
|
||||
& itmax,iter,err,itrace,istop,cond)
|
||||
use psb_base_mod
|
||||
use psb_prec_mod
|
||||
use psb_c_linsolve_conv_mod
|
||||
use psb_linsolve_mod
|
||||
implicit none
|
||||
type(psb_cspmat_type), intent(in) :: a
|
||||
Type(psb_desc_type), Intent(in) :: desc_a
|
||||
class(psb_cprec_type), intent(inout) :: prec
|
||||
type(psb_c_vect_type), Intent(inout) :: b
|
||||
type(psb_c_vect_type), Intent(inout) :: x
|
||||
Real(psb_spk_), Intent(in) :: eps
|
||||
integer(psb_ipk_), intent(out) :: info
|
||||
integer(psb_ipk_), Optional, Intent(in) :: itmax, itrace, istop
|
||||
integer(psb_ipk_), Optional, Intent(out) :: iter
|
||||
Real(psb_spk_), Optional, Intent(out) :: err, cond
|
||||
! = Local data
|
||||
complex(psb_spk_), allocatable, target :: aux(:)
|
||||
type(psb_c_vect_type), allocatable, target :: wwrk(:)
|
||||
type(psb_c_vect_type), pointer :: y, r1, r2, v, w, w1, w2, wtmp, res
|
||||
complex(psb_spk_) :: alfa, beta, beta1, dbar, delta, denom
|
||||
complex(psb_spk_) :: epsln, gamma, gbar, oldb, oldeps, phi, phibar
|
||||
complex(psb_spk_) :: rhs1, rhs2, s, zeta, betatmp
|
||||
complex(psb_spk_) :: rotx(1), roty(1)
|
||||
real(psb_spk_) :: cs
|
||||
complex(psb_spk_) :: sn
|
||||
integer(psb_ipk_) :: itmax_, istop_, naux, itx, itrace_, n_col, n_row, err_act
|
||||
integer(psb_lpk_) :: mglob
|
||||
integer(psb_ipk_) :: debug_level, debug_unit
|
||||
type(psb_ctxt_type) :: ctxt
|
||||
integer(psb_ipk_) :: np, me
|
||||
real(psb_dpk_) :: derr, errnum, errden, deps
|
||||
logical :: do_cond
|
||||
logical :: converged
|
||||
real(psb_spk_) :: epsmach
|
||||
real(psb_spk_) :: gmax, gmin, tnorm2, ynorm2
|
||||
real(psb_spk_) :: rni, xni, bni, ani, bn2, r0n2
|
||||
character(len=20) :: name
|
||||
character(len=*), parameter :: methdname='MINRES'
|
||||
|
||||
info = psb_success_
|
||||
name = 'psb_cminres'
|
||||
call psb_erractionsave(err_act)
|
||||
debug_unit = psb_get_debug_unit()
|
||||
debug_level = psb_get_debug_level()
|
||||
|
||||
ctxt = desc_a%get_context()
|
||||
|
||||
call psb_info(ctxt, me, np)
|
||||
if (.not.allocated(b%v)) then
|
||||
info = psb_err_invalid_vect_state_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
endif
|
||||
if (.not.allocated(x%v)) then
|
||||
info = psb_err_invalid_vect_state_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
endif
|
||||
|
||||
|
||||
mglob = desc_a%get_global_rows()
|
||||
n_row = desc_a%get_local_rows()
|
||||
n_col = desc_a%get_local_cols()
|
||||
|
||||
|
||||
if (present(istop)) then
|
||||
istop_ = istop
|
||||
else
|
||||
istop_ = psb_get_istop_default()
|
||||
endif
|
||||
if (.not.psb_is_valid_istop(istop_)) then
|
||||
info=psb_err_invalid_istop_
|
||||
err=info
|
||||
call psb_errpush(info,name,i_err=(/istop_/))
|
||||
goto 9999
|
||||
end if
|
||||
!
|
||||
! istop_ = 1: normwise backward error, infinity norm
|
||||
! istop_ = 2: ||r||/||b|| norm 2
|
||||
!
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_,psb_istop_bn2_,&
|
||||
& psb_istop_rn2_abs_, psb_istop_rrn2_)
|
||||
! nothing needed
|
||||
case default
|
||||
! should never get here
|
||||
info=psb_err_internal_error_
|
||||
err=info
|
||||
call psb_errpush(info,name,a_err="invalid istop_")
|
||||
goto 9999
|
||||
end select
|
||||
|
||||
call psb_chkvect(mglob,lone,x%get_nrows(),lone,lone,desc_a,info)
|
||||
if (info == psb_success_)&
|
||||
& call psb_chkvect(mglob,lone,b%get_nrows(),lone,lone,desc_a,info)
|
||||
if(info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_
|
||||
call psb_errpush(info,name,a_err='psb_chkvect on X/B')
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
naux=4*n_col
|
||||
allocate(aux(naux), stat=info)
|
||||
if (info == psb_success_) call psb_geall(wwrk,desc_a,info,n=9_psb_ipk_)
|
||||
if (info == psb_success_) call psb_geasb(wwrk,desc_a,info,mold=x%v,scratch=.true.)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (present(itmax)) then
|
||||
itmax_ = itmax
|
||||
else
|
||||
itmax_ = 1000
|
||||
endif
|
||||
|
||||
if (present(itrace)) then
|
||||
itrace_ = itrace
|
||||
else
|
||||
itrace_ = 0
|
||||
end if
|
||||
|
||||
y => wwrk(1)
|
||||
r1 => wwrk(2)
|
||||
r2 => wwrk(3)
|
||||
v => wwrk(4)
|
||||
w => wwrk(5)
|
||||
w1 => wwrk(6)
|
||||
w2 => wwrk(7)
|
||||
wtmp => wwrk(8)
|
||||
res => wwrk(9)
|
||||
|
||||
do_cond = present(cond)
|
||||
epsmach = epsilon(sone)
|
||||
|
||||
! res = b - A*x
|
||||
call psb_geaxpby(cone,b,czero,res,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(-cone,a,x,cone,res,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
ani = psb_spnrmi(a,desc_a,info)
|
||||
bni = psb_geamax(b,desc_a,info)
|
||||
case(psb_istop_bn2_)
|
||||
bn2 = psb_genrm2(b,desc_a,info)
|
||||
case(psb_istop_rn2_abs_)
|
||||
! nothing needed
|
||||
case(psb_istop_rrn2_)
|
||||
r0n2 = psb_genrm2(res,desc_a,info)
|
||||
end select
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
errnum = czero
|
||||
errden = cone
|
||||
deps = eps
|
||||
converged = .false.
|
||||
if ((itrace_ > 0).and.(me == 0)) call log_header(methdname)
|
||||
|
||||
! y = beta1 * P' * v1, with v1 the first Lanczos vector.
|
||||
call psb_geaxpby(cone,res,czero,y,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(cone,res,czero,r1,desc_a,info)
|
||||
if (info == psb_success_) call prec%apply(res,y,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
beta1 = sqrt(psb_gedot(res,y,desc_a,info))
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
! If beta1 is numerically zero, x is already acceptable.
|
||||
if (abs(beta1) <= epsmach) then
|
||||
itx = 0
|
||||
converged = .true.
|
||||
if (do_cond) cond = szero
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
rni = psb_geamax(res,desc_a,info)
|
||||
xni = psb_geamax(x,desc_a,info)
|
||||
errnum = rni
|
||||
errden = ani*xni + bni
|
||||
case(psb_istop_bn2_)
|
||||
errnum = abs(beta1)
|
||||
errden = bn2
|
||||
case(psb_istop_rn2_abs_)
|
||||
errnum = abs(beta1)
|
||||
errden = sone
|
||||
case(psb_istop_rrn2_)
|
||||
errnum = abs(beta1)
|
||||
errden = r0n2
|
||||
end select
|
||||
if (errden == szero) errden = sone
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
end if
|
||||
|
||||
beta = beta1
|
||||
oldb = czero
|
||||
dbar = czero
|
||||
epsln = czero
|
||||
phibar = beta1
|
||||
rhs1 = beta1
|
||||
rhs2 = czero
|
||||
cs = -sone
|
||||
sn = czero
|
||||
itx = 0
|
||||
|
||||
if (do_cond) then
|
||||
tnorm2 = 0.0_psb_spk_
|
||||
ynorm2 = 0.0_psb_spk_
|
||||
gmax = 0.0_psb_spk_
|
||||
gmin = huge(sone)
|
||||
end if
|
||||
|
||||
call psb_geaxpby(cone,r1,czero,r2,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(czero,x,czero,w,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(czero,x,czero,w1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(czero,x,czero,w2,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (.not.converged) then
|
||||
do while (itx < itmax_)
|
||||
if (abs(beta) <= epsmach) exit
|
||||
itx = itx + 1
|
||||
|
||||
s = cone/beta
|
||||
call psb_geaxpby(s,y,czero,v,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(cone,a,v,czero,y,desc_a,info,work=aux)
|
||||
if (itx >= 2 .and. info == psb_success_) then
|
||||
call psb_geaxpby((-beta/oldb),r1,cone,y,desc_a,info)
|
||||
end if
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
alfa = psb_gedot(v,y,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
call psb_geaxpby((-alfa/beta),r2,cone,y,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(cone,r2,czero,r1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(cone,y,czero,r2,desc_a,info)
|
||||
if (info == psb_success_) call prec%apply(r2,y,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
oldb = beta
|
||||
beta = sqrt(psb_gedot(r2,y,desc_a,info))
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
tnorm2 = tnorm2 + abs(alfa)**2 + abs(oldb)**2 + abs(beta)**2
|
||||
if (itx == 1) then
|
||||
gmax = abs(alfa)
|
||||
gmin = gmax
|
||||
end if
|
||||
end if
|
||||
|
||||
oldeps = epsln
|
||||
delta = dbar
|
||||
gbar = alfa
|
||||
rotx(1) = delta
|
||||
roty(1) = gbar
|
||||
call crot(1,rotx,1,roty,1,cs,sn)
|
||||
delta = rotx(1)
|
||||
gbar = -roty(1)
|
||||
|
||||
epsln = czero
|
||||
dbar = beta
|
||||
rotx(1) = epsln
|
||||
roty(1) = dbar
|
||||
call crot(1,rotx,1,roty,1,cs,sn)
|
||||
epsln = rotx(1)
|
||||
dbar = -roty(1)
|
||||
|
||||
gamma = gbar
|
||||
betatmp = beta
|
||||
call crotg(gamma,betatmp,cs,sn)
|
||||
if (abs(gamma) <= epsmach) exit
|
||||
|
||||
phi = phibar
|
||||
phibar = czero
|
||||
rotx(1) = phi
|
||||
roty(1) = phibar
|
||||
call crot(1,rotx,1,roty,1,cs,-sn)
|
||||
phi = rotx(1)
|
||||
phibar = roty(1)
|
||||
|
||||
denom = cone/gamma
|
||||
call psb_geaxpby(cone,w2,czero,w1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(cone,w,czero,w2,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(cone,v,czero,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(-oldeps,w1,cone,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(-delta,w2,cone,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(denom,wtmp,czero,w,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(phi,w,cone,x,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
gmax = max(gmax,abs(gamma))
|
||||
gmin = min(gmin,abs(gamma))
|
||||
zeta = rhs1/gamma
|
||||
ynorm2 = ynorm2 + abs(zeta)**2
|
||||
rhs1 = rhs2 - delta*zeta
|
||||
rhs2 = -epsln*zeta
|
||||
end if
|
||||
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
! Compute true residual only for the ANI stopping criterion.
|
||||
call psb_geaxpby(cone,b,czero,res,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(-cone,a,x,cone,res,desc_a,info,work=aux)
|
||||
if (info == psb_success_) rni = psb_geamax(res,desc_a,info)
|
||||
if (info == psb_success_) xni = psb_geamax(x,desc_a,info)
|
||||
errnum = rni
|
||||
errden = ani*xni + bni
|
||||
case(psb_istop_bn2_)
|
||||
errnum = abs(phibar)
|
||||
errden = bn2
|
||||
case(psb_istop_rn2_abs_)
|
||||
errnum = abs(phibar)
|
||||
errden = sone
|
||||
case(psb_istop_rrn2_)
|
||||
errnum = abs(phibar)
|
||||
errden = r0n2
|
||||
end select
|
||||
if (errden == szero) errden = sone
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (itrace_ > 0) &
|
||||
& call log_conv(methdname,me,itx,itrace_,errnum,errden,deps)
|
||||
|
||||
if (errnum <= eps*errden) then
|
||||
converged = .true.
|
||||
exit
|
||||
end if
|
||||
end do
|
||||
end if
|
||||
|
||||
if ((.not.converged) .and. (itx >= itmax_)) then
|
||||
if (debug_level >= psb_debug_ext_)&
|
||||
& write(debug_unit,*) me,' ',trim(name),': MINRES reached iteration limit'
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
if (gmin > 0.0_psb_spk_) then
|
||||
cond = gmax/gmin
|
||||
else
|
||||
cond = huge(sone)
|
||||
end if
|
||||
end if
|
||||
|
||||
call log_end(methdname,me,itx,itrace_,errnum,errden,deps,err=derr,iter=iter)
|
||||
if (present(err)) err = derr
|
||||
|
||||
if (info == psb_success_) call psb_gefree(wwrk,desc_a,info)
|
||||
if (info == psb_success_) deallocate(aux,stat=info)
|
||||
if (info /= psb_success_) then
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
|
||||
call psb_erractionrestore(err_act)
|
||||
return
|
||||
|
||||
9999 call psb_error_handler(err_act)
|
||||
return
|
||||
|
||||
end subroutine psb_cminres_vect
|
||||
@ -0,0 +1,526 @@
|
||||
!
|
||||
! Parallel Sparse BLAS version 3.5
|
||||
! (C) Copyright 2006-2018
|
||||
! Salvatore Filippone
|
||||
! Alfredo Buttari
|
||||
!
|
||||
! Redistribution and use in source and binary forms, with or without
|
||||
! modification, are permitted provided that the following conditions
|
||||
! are met:
|
||||
! 1. Redistributions of source code must retain the above copyright
|
||||
! notice, this list of conditions and the following disclaimer.
|
||||
! 2. Redistributions in binary form must reproduce the above copyright
|
||||
! notice, this list of conditions, and the following disclaimer in the
|
||||
! documentation and/or other materials provided with the distribution.
|
||||
! 3. The name of the PSBLAS group or the names of its contributors may
|
||||
! not be used to endorse or promote products derived from this
|
||||
! software without specific prior written permission.
|
||||
!
|
||||
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||||
! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
|
||||
! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
! POSSIBILITY OF SUCH DAMAGE.
|
||||
!
|
||||
!
|
||||
! File: psb_dminres.f90
|
||||
! CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
|
||||
! C C
|
||||
! C References: C
|
||||
! C [1] Duff, I., Marrone, M., Radicati, G., and Vittoli, C. C
|
||||
! C Level 3 basic linear algebra subprograms for sparse C
|
||||
! C matrices: a user level interface C
|
||||
! C ACM Trans. Math. Softw., 23(3), 379-401, 1997. C
|
||||
! C C
|
||||
! C C
|
||||
! C [2] S. Filippone, M. Colajanni C
|
||||
! C PSBLAS: A library for parallel linear algebra C
|
||||
! C computation on sparse matrices C
|
||||
! C ACM Trans. on Math. Softw., 26(4), 527-550, Dec. 2000. C
|
||||
! C C
|
||||
! C [3] M. Arioli, I. Duff, M. Ruiz C
|
||||
! C Stopping criteria for iterative solvers C
|
||||
! C SIAM J. Matrix Anal. Appl., Vol. 13, pp. 138-144, 1992 C
|
||||
! C C
|
||||
! C C
|
||||
! C [4] R. Barrett et al C
|
||||
! C Templates for the solution of linear systems C
|
||||
! C SIAM, 1993
|
||||
! C C
|
||||
! C C
|
||||
! CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
|
||||
! File: psb_dminres.f90
|
||||
!
|
||||
! Subroutine: psb_dminres
|
||||
! This subroutine implements the MINRES method.
|
||||
!
|
||||
!
|
||||
! Arguments:
|
||||
!
|
||||
! a - type(psb_dspmat_type) Input: sparse matrix containing A.
|
||||
! prec - class(psb_dprec_type) Input: preconditioner
|
||||
! b(:) - real Input: vector containing the
|
||||
! right hand side B
|
||||
! x(:) - real Input/Output: vector containing the
|
||||
! initial guess and final solution X.
|
||||
! eps - real Input: Stopping tolerance; the iteration is
|
||||
! stopped when the error estimate |err| <= eps
|
||||
! desc_a - type(psb_desc_type). Input: The communication descriptor.
|
||||
! info - integer. Output: Return code
|
||||
!
|
||||
! itmax - integer(optional) Input: maximum number of iterations to be
|
||||
! performed.
|
||||
! iter - integer(optional) Output: how many iterations have been
|
||||
! performed.
|
||||
! performed.
|
||||
! err - real (optional) Output: error estimate on exit. If the
|
||||
! denominator of the estimate is exactly
|
||||
! 0, it is changed into 1.
|
||||
! itrace - integer(optional) Input: print an informational message
|
||||
! with the error estimate every itrace
|
||||
! iterations
|
||||
! istop - integer(optional) Input: stopping criterion, or how
|
||||
! to estimate the error.
|
||||
! 1: err = |r|/(|a||x|+|b|); here the iteration is
|
||||
! stopped when |r| <= eps * (|a||x|+|b|)
|
||||
! 2: err = |r|/|b|; here the iteration is
|
||||
! stopped when |r| <= eps * |b|
|
||||
! where r is the (preconditioned, recursive
|
||||
! estimate of) residual.
|
||||
!
|
||||
!
|
||||
subroutine psb_dminres_vect(a,prec,b,x,eps,desc_a,info,&
|
||||
& itmax,iter,err,itrace,istop,cond)
|
||||
use psb_base_mod
|
||||
use psb_prec_mod
|
||||
use psb_d_linsolve_conv_mod
|
||||
use psb_linsolve_mod
|
||||
implicit none
|
||||
type(psb_dspmat_type), intent(in) :: a
|
||||
Type(psb_desc_type), Intent(in) :: desc_a
|
||||
class(psb_dprec_type), intent(inout) :: prec
|
||||
type(psb_d_vect_type), Intent(inout) :: b
|
||||
type(psb_d_vect_type), Intent(inout) :: x
|
||||
Real(psb_dpk_), Intent(in) :: eps
|
||||
integer(psb_ipk_), intent(out) :: info
|
||||
integer(psb_ipk_), Optional, Intent(in) :: itmax, itrace, istop
|
||||
integer(psb_ipk_), Optional, Intent(out) :: iter
|
||||
Real(psb_dpk_), Optional, Intent(out) :: err, cond
|
||||
! = Local data
|
||||
real(psb_dpk_), allocatable, target :: aux(:)
|
||||
type(psb_d_vect_type), allocatable, target :: wwrk(:)
|
||||
type(psb_d_vect_type), pointer :: y, r1, r2, v, w, w1, w2, wtmp, res
|
||||
real(psb_dpk_) :: alfa, beta, beta1, dbar, delta, denom
|
||||
real(psb_dpk_) :: epsln, gamma, gbar, oldb, oldeps, phi, phibar
|
||||
real(psb_dpk_) :: rhs1, rhs2, s, zeta, betatmp
|
||||
real(psb_dpk_) :: rotx(1), roty(1)
|
||||
real(psb_dpk_) :: cs
|
||||
real(psb_dpk_) :: sn
|
||||
integer(psb_ipk_) :: itmax_, istop_, naux, itx, itrace_, n_col, n_row, err_act
|
||||
integer(psb_lpk_) :: mglob
|
||||
integer(psb_ipk_) :: debug_level, debug_unit
|
||||
type(psb_ctxt_type) :: ctxt
|
||||
integer(psb_ipk_) :: np, me
|
||||
real(psb_dpk_) :: derr, errnum, errden, deps
|
||||
logical :: do_cond
|
||||
logical :: converged
|
||||
real(psb_dpk_) :: epsmach
|
||||
real(psb_dpk_) :: gmax, gmin, tnorm2, ynorm2
|
||||
real(psb_dpk_) :: rni, xni, bni, ani, bn2, r0n2
|
||||
real(psb_dpk_) :: dotv
|
||||
character(len=20) :: name
|
||||
character(len=*), parameter :: methdname='MINRES'
|
||||
|
||||
info = psb_success_
|
||||
name = 'psb_dminres'
|
||||
call psb_erractionsave(err_act)
|
||||
debug_unit = psb_get_debug_unit()
|
||||
debug_level = psb_get_debug_level()
|
||||
|
||||
ctxt = desc_a%get_context()
|
||||
|
||||
call psb_info(ctxt, me, np)
|
||||
if (.not.allocated(b%v)) then
|
||||
info = psb_err_invalid_vect_state_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
endif
|
||||
if (.not.allocated(x%v)) then
|
||||
info = psb_err_invalid_vect_state_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
endif
|
||||
|
||||
|
||||
mglob = desc_a%get_global_rows()
|
||||
n_row = desc_a%get_local_rows()
|
||||
n_col = desc_a%get_local_cols()
|
||||
|
||||
|
||||
if (present(istop)) then
|
||||
istop_ = istop
|
||||
else
|
||||
istop_ = psb_get_istop_default()
|
||||
endif
|
||||
if (.not.psb_is_valid_istop(istop_)) then
|
||||
info=psb_err_invalid_istop_
|
||||
err=info
|
||||
call psb_errpush(info,name,i_err=(/istop_/))
|
||||
goto 9999
|
||||
end if
|
||||
!
|
||||
! istop_ = 1: normwise backward error, infinity norm
|
||||
! istop_ = 2: ||r||/||b|| norm 2
|
||||
!
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_,psb_istop_bn2_,&
|
||||
& psb_istop_rn2_abs_, psb_istop_rrn2_)
|
||||
! nothing needed
|
||||
case default
|
||||
! should never get here
|
||||
info=psb_err_internal_error_
|
||||
err=info
|
||||
call psb_errpush(info,name,a_err="invalid istop_")
|
||||
goto 9999
|
||||
end select
|
||||
|
||||
call psb_chkvect(mglob,lone,x%get_nrows(),lone,lone,desc_a,info)
|
||||
if (info == psb_success_)&
|
||||
& call psb_chkvect(mglob,lone,b%get_nrows(),lone,lone,desc_a,info)
|
||||
if(info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_
|
||||
call psb_errpush(info,name,a_err='psb_chkvect on X/B')
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
naux=4*n_col
|
||||
allocate(aux(naux), stat=info)
|
||||
if (info == psb_success_) call psb_geall(wwrk,desc_a,info,n=9_psb_ipk_)
|
||||
if (info == psb_success_) call psb_geasb(wwrk,desc_a,info,mold=x%v,scratch=.true.)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (present(itmax)) then
|
||||
itmax_ = itmax
|
||||
else
|
||||
itmax_ = 1000
|
||||
endif
|
||||
|
||||
if (present(itrace)) then
|
||||
itrace_ = itrace
|
||||
else
|
||||
itrace_ = 0
|
||||
end if
|
||||
|
||||
y => wwrk(1)
|
||||
r1 => wwrk(2)
|
||||
r2 => wwrk(3)
|
||||
v => wwrk(4)
|
||||
w => wwrk(5)
|
||||
w1 => wwrk(6)
|
||||
w2 => wwrk(7)
|
||||
wtmp => wwrk(8)
|
||||
res => wwrk(9)
|
||||
|
||||
do_cond = present(cond)
|
||||
epsmach = epsilon(done)
|
||||
|
||||
! res = b - A*x
|
||||
call psb_geaxpby(done,b,dzero,res,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(-done,a,x,done,res,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
ani = psb_spnrmi(a,desc_a,info)
|
||||
bni = psb_geamax(b,desc_a,info)
|
||||
case(psb_istop_bn2_)
|
||||
bn2 = psb_genrm2(b,desc_a,info)
|
||||
case(psb_istop_rn2_abs_)
|
||||
! nothing needed
|
||||
case(psb_istop_rrn2_)
|
||||
r0n2 = psb_genrm2(res,desc_a,info)
|
||||
end select
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
errnum = dzero
|
||||
errden = done
|
||||
deps = eps
|
||||
converged = .false.
|
||||
if ((itrace_ > 0).and.(me == 0)) call log_header(methdname)
|
||||
|
||||
! y = beta1 * P' * v1, with v1 the first Lanczos vector.
|
||||
call psb_geaxpby(done,res,dzero,y,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(done,res,dzero,r1,desc_a,info)
|
||||
if (info == psb_success_) call prec%apply(res,y,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
dotv = psb_gedot(res,y,desc_a,info)
|
||||
if (dotv < -epsmach*max(done,abs(dotv))) then
|
||||
info=psb_err_pivot_too_small_
|
||||
call psb_errpush(info,name,a_err='MINRES breakdown: negative (r,z)')
|
||||
goto 9999
|
||||
end if
|
||||
if (dotv < dzero) dotv = dzero
|
||||
beta1 = sqrt(dotv)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
! If beta1 is numerically zero, x is already acceptable.
|
||||
if (abs(beta1) <= epsmach) then
|
||||
itx = 0
|
||||
converged = .true.
|
||||
if (do_cond) cond = dzero
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
rni = psb_geamax(res,desc_a,info)
|
||||
xni = psb_geamax(x,desc_a,info)
|
||||
errnum = rni
|
||||
errden = ani*xni + bni
|
||||
case(psb_istop_bn2_)
|
||||
errnum = abs(beta1)
|
||||
errden = bn2
|
||||
case(psb_istop_rn2_abs_)
|
||||
errnum = abs(beta1)
|
||||
errden = done
|
||||
case(psb_istop_rrn2_)
|
||||
errnum = abs(beta1)
|
||||
errden = r0n2
|
||||
end select
|
||||
if (errden == dzero) errden = done
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
end if
|
||||
|
||||
beta = beta1
|
||||
oldb = dzero
|
||||
dbar = dzero
|
||||
epsln = dzero
|
||||
phibar = beta1
|
||||
rhs1 = beta1
|
||||
rhs2 = dzero
|
||||
cs = -done
|
||||
sn = dzero
|
||||
itx = 0
|
||||
|
||||
if (do_cond) then
|
||||
tnorm2 = 0.0_psb_dpk_
|
||||
ynorm2 = 0.0_psb_dpk_
|
||||
gmax = 0.0_psb_dpk_
|
||||
gmin = huge(done)
|
||||
end if
|
||||
|
||||
call psb_geaxpby(done,r1,dzero,r2,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(dzero,x,dzero,w,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(dzero,x,dzero,w1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(dzero,x,dzero,w2,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (.not.converged) then
|
||||
do while (itx < itmax_)
|
||||
if (abs(beta) <= epsmach) exit
|
||||
itx = itx + 1
|
||||
|
||||
s = done/beta
|
||||
call psb_geaxpby(s,y,dzero,v,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(done,a,v,dzero,y,desc_a,info,work=aux)
|
||||
if (itx >= 2 .and. info == psb_success_) then
|
||||
call psb_geaxpby((-beta/oldb),r1,done,y,desc_a,info)
|
||||
end if
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
alfa = psb_gedot(v,y,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
call psb_geaxpby((-alfa/beta),r2,done,y,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(done,r2,dzero,r1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(done,y,dzero,r2,desc_a,info)
|
||||
if (info == psb_success_) call prec%apply(r2,y,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
oldb = beta
|
||||
dotv = psb_gedot(r2,y,desc_a,info)
|
||||
if (dotv < -epsmach*max(done,abs(dotv))) then
|
||||
info=psb_err_pivot_too_small_
|
||||
call psb_errpush(info,name,a_err='MINRES breakdown: negative (r2,z2)')
|
||||
goto 9999
|
||||
end if
|
||||
if (dotv < dzero) dotv = dzero
|
||||
beta = sqrt(dotv)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
tnorm2 = tnorm2 + abs(alfa)**2 + abs(oldb)**2 + abs(beta)**2
|
||||
if (itx == 1) then
|
||||
gmax = abs(alfa)
|
||||
gmin = gmax
|
||||
end if
|
||||
end if
|
||||
|
||||
oldeps = epsln
|
||||
delta = dbar
|
||||
gbar = alfa
|
||||
rotx(1) = delta
|
||||
roty(1) = gbar
|
||||
call drot(1,rotx,1,roty,1,cs,sn)
|
||||
delta = rotx(1)
|
||||
gbar = -roty(1)
|
||||
|
||||
epsln = dzero
|
||||
dbar = beta
|
||||
rotx(1) = epsln
|
||||
roty(1) = dbar
|
||||
call drot(1,rotx,1,roty,1,cs,sn)
|
||||
epsln = rotx(1)
|
||||
dbar = -roty(1)
|
||||
|
||||
gamma = gbar
|
||||
betatmp = beta
|
||||
call drotg(gamma,betatmp,cs,sn)
|
||||
if (abs(gamma) <= epsmach) exit
|
||||
|
||||
phi = phibar
|
||||
phibar = dzero
|
||||
rotx(1) = phi
|
||||
roty(1) = phibar
|
||||
call drot(1,rotx,1,roty,1,cs,-sn)
|
||||
phi = rotx(1)
|
||||
phibar = roty(1)
|
||||
|
||||
denom = done/gamma
|
||||
call psb_geaxpby(done,w2,dzero,w1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(done,w,dzero,w2,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(done,v,dzero,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(-oldeps,w1,done,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(-delta,w2,done,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(denom,wtmp,dzero,w,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(phi,w,done,x,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
gmax = max(gmax,abs(gamma))
|
||||
gmin = min(gmin,abs(gamma))
|
||||
zeta = rhs1/gamma
|
||||
ynorm2 = ynorm2 + abs(zeta)**2
|
||||
rhs1 = rhs2 - delta*zeta
|
||||
rhs2 = -epsln*zeta
|
||||
end if
|
||||
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
! Compute true residual only for the ANI stopping criterion.
|
||||
call psb_geaxpby(done,b,dzero,res,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(-done,a,x,done,res,desc_a,info,work=aux)
|
||||
if (info == psb_success_) rni = psb_geamax(res,desc_a,info)
|
||||
if (info == psb_success_) xni = psb_geamax(x,desc_a,info)
|
||||
errnum = rni
|
||||
errden = ani*xni + bni
|
||||
case(psb_istop_bn2_)
|
||||
errnum = abs(phibar)
|
||||
errden = bn2
|
||||
case(psb_istop_rn2_abs_)
|
||||
errnum = abs(phibar)
|
||||
errden = done
|
||||
case(psb_istop_rrn2_)
|
||||
errnum = abs(phibar)
|
||||
errden = r0n2
|
||||
end select
|
||||
if (errden == dzero) errden = done
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (itrace_ > 0) &
|
||||
& call log_conv(methdname,me,itx,itrace_,errnum,errden,deps)
|
||||
|
||||
if (errnum <= eps*errden) then
|
||||
converged = .true.
|
||||
exit
|
||||
end if
|
||||
end do
|
||||
end if
|
||||
|
||||
if ((.not.converged) .and. (itx >= itmax_)) then
|
||||
if (debug_level >= psb_debug_ext_)&
|
||||
& write(debug_unit,*) me,' ',trim(name),': MINRES reached iteration limit'
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
if (gmin > 0.0_psb_dpk_) then
|
||||
cond = gmax/gmin
|
||||
else
|
||||
cond = huge(done)
|
||||
end if
|
||||
end if
|
||||
|
||||
call log_end(methdname,me,itx,itrace_,errnum,errden,deps,err=derr,iter=iter)
|
||||
if (present(err)) err = derr
|
||||
|
||||
if (info == psb_success_) call psb_gefree(wwrk,desc_a,info)
|
||||
if (info == psb_success_) deallocate(aux,stat=info)
|
||||
if (info /= psb_success_) then
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
|
||||
call psb_erractionrestore(err_act)
|
||||
return
|
||||
|
||||
9999 call psb_error_handler(err_act)
|
||||
return
|
||||
|
||||
end subroutine psb_dminres_vect
|
||||
@ -0,0 +1,526 @@
|
||||
!
|
||||
! Parallel Sparse BLAS version 3.5
|
||||
! (C) Copyright 2006-2018
|
||||
! Salvatore Filippone
|
||||
! Alfredo Buttari
|
||||
!
|
||||
! Redistribution and use in source and binary forms, with or without
|
||||
! modification, are permitted provided that the following conditions
|
||||
! are met:
|
||||
! 1. Redistributions of source code must retain the above copyright
|
||||
! notice, this list of conditions and the following disclaimer.
|
||||
! 2. Redistributions in binary form must reproduce the above copyright
|
||||
! notice, this list of conditions, and the following disclaimer in the
|
||||
! documentation and/or other materials provided with the distribution.
|
||||
! 3. The name of the PSBLAS group or the names of its contributors may
|
||||
! not be used to endorse or promote products derived from this
|
||||
! software without specific prior written permission.
|
||||
!
|
||||
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||||
! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
|
||||
! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
! POSSIBILITY OF SUCH DAMAGE.
|
||||
!
|
||||
!
|
||||
! File: psb_sminres.f90
|
||||
! CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
|
||||
! C C
|
||||
! C References: C
|
||||
! C [1] Duff, I., Marrone, M., Radicati, G., and Vittoli, C. C
|
||||
! C Level 3 basic linear algebra subprograms for sparse C
|
||||
! C matrices: a user level interface C
|
||||
! C ACM Trans. Math. Softw., 23(3), 379-401, 1997. C
|
||||
! C C
|
||||
! C C
|
||||
! C [2] S. Filippone, M. Colajanni C
|
||||
! C PSBLAS: A library for parallel linear algebra C
|
||||
! C computation on sparse matrices C
|
||||
! C ACM Trans. on Math. Softw., 26(4), 527-550, Dec. 2000. C
|
||||
! C C
|
||||
! C [3] M. Arioli, I. Duff, M. Ruiz C
|
||||
! C Stopping criteria for iterative solvers C
|
||||
! C SIAM J. Matrix Anal. Appl., Vol. 13, pp. 138-144, 1992 C
|
||||
! C C
|
||||
! C C
|
||||
! C [4] R. Barrett et al C
|
||||
! C Templates for the solution of linear systems C
|
||||
! C SIAM, 1993
|
||||
! C C
|
||||
! C C
|
||||
! CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
|
||||
! File: psb_sminres.f90
|
||||
!
|
||||
! Subroutine: psb_sminres
|
||||
! This subroutine implements the MINRES method.
|
||||
!
|
||||
!
|
||||
! Arguments:
|
||||
!
|
||||
! a - type(psb_sspmat_type) Input: sparse matrix containing A.
|
||||
! prec - class(psb_sprec_type) Input: preconditioner
|
||||
! b(:) - real Input: vector containing the
|
||||
! right hand side B
|
||||
! x(:) - real Input/Output: vector containing the
|
||||
! initial guess and final solution X.
|
||||
! eps - real Input: Stopping tolerance; the iteration is
|
||||
! stopped when the error estimate |err| <= eps
|
||||
! desc_a - type(psb_desc_type). Input: The communication descriptor.
|
||||
! info - integer. Output: Return code
|
||||
!
|
||||
! itmax - integer(optional) Input: maximum number of iterations to be
|
||||
! performed.
|
||||
! iter - integer(optional) Output: how many iterations have been
|
||||
! performed.
|
||||
! performed.
|
||||
! err - real (optional) Output: error estimate on exit. If the
|
||||
! denominator of the estimate is exactly
|
||||
! 0, it is changed into 1.
|
||||
! itrace - integer(optional) Input: print an informational message
|
||||
! with the error estimate every itrace
|
||||
! iterations
|
||||
! istop - integer(optional) Input: stopping criterion, or how
|
||||
! to estimate the error.
|
||||
! 1: err = |r|/(|a||x|+|b|); here the iteration is
|
||||
! stopped when |r| <= eps * (|a||x|+|b|)
|
||||
! 2: err = |r|/|b|; here the iteration is
|
||||
! stopped when |r| <= eps * |b|
|
||||
! where r is the (preconditioned, recursive
|
||||
! estimate of) residual.
|
||||
!
|
||||
!
|
||||
subroutine psb_sminres_vect(a,prec,b,x,eps,desc_a,info,&
|
||||
& itmax,iter,err,itrace,istop,cond)
|
||||
use psb_base_mod
|
||||
use psb_prec_mod
|
||||
use psb_s_linsolve_conv_mod
|
||||
use psb_linsolve_mod
|
||||
implicit none
|
||||
type(psb_sspmat_type), intent(in) :: a
|
||||
Type(psb_desc_type), Intent(in) :: desc_a
|
||||
class(psb_sprec_type), intent(inout) :: prec
|
||||
type(psb_s_vect_type), Intent(inout) :: b
|
||||
type(psb_s_vect_type), Intent(inout) :: x
|
||||
Real(psb_spk_), Intent(in) :: eps
|
||||
integer(psb_ipk_), intent(out) :: info
|
||||
integer(psb_ipk_), Optional, Intent(in) :: itmax, itrace, istop
|
||||
integer(psb_ipk_), Optional, Intent(out) :: iter
|
||||
Real(psb_spk_), Optional, Intent(out) :: err, cond
|
||||
! = Local data
|
||||
real(psb_spk_), allocatable, target :: aux(:)
|
||||
type(psb_s_vect_type), allocatable, target :: wwrk(:)
|
||||
type(psb_s_vect_type), pointer :: y, r1, r2, v, w, w1, w2, wtmp, res
|
||||
real(psb_spk_) :: alfa, beta, beta1, dbar, delta, denom
|
||||
real(psb_spk_) :: epsln, gamma, gbar, oldb, oldeps, phi, phibar
|
||||
real(psb_spk_) :: rhs1, rhs2, s, zeta, betatmp
|
||||
real(psb_spk_) :: rotx(1), roty(1)
|
||||
real(psb_spk_) :: cs
|
||||
real(psb_spk_) :: sn
|
||||
integer(psb_ipk_) :: itmax_, istop_, naux, itx, itrace_, n_col, n_row, err_act
|
||||
integer(psb_lpk_) :: mglob
|
||||
integer(psb_ipk_) :: debug_level, debug_unit
|
||||
type(psb_ctxt_type) :: ctxt
|
||||
integer(psb_ipk_) :: np, me
|
||||
real(psb_dpk_) :: derr, errnum, errden, deps
|
||||
logical :: do_cond
|
||||
logical :: converged
|
||||
real(psb_spk_) :: epsmach
|
||||
real(psb_spk_) :: gmax, gmin, tnorm2, ynorm2
|
||||
real(psb_spk_) :: rni, xni, bni, ani, bn2, r0n2
|
||||
real(psb_spk_) :: dotv
|
||||
character(len=20) :: name
|
||||
character(len=*), parameter :: methdname='MINRES'
|
||||
|
||||
info = psb_success_
|
||||
name = 'psb_sminres'
|
||||
call psb_erractionsave(err_act)
|
||||
debug_unit = psb_get_debug_unit()
|
||||
debug_level = psb_get_debug_level()
|
||||
|
||||
ctxt = desc_a%get_context()
|
||||
|
||||
call psb_info(ctxt, me, np)
|
||||
if (.not.allocated(b%v)) then
|
||||
info = psb_err_invalid_vect_state_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
endif
|
||||
if (.not.allocated(x%v)) then
|
||||
info = psb_err_invalid_vect_state_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
endif
|
||||
|
||||
|
||||
mglob = desc_a%get_global_rows()
|
||||
n_row = desc_a%get_local_rows()
|
||||
n_col = desc_a%get_local_cols()
|
||||
|
||||
|
||||
if (present(istop)) then
|
||||
istop_ = istop
|
||||
else
|
||||
istop_ = psb_get_istop_default()
|
||||
endif
|
||||
if (.not.psb_is_valid_istop(istop_)) then
|
||||
info=psb_err_invalid_istop_
|
||||
err=info
|
||||
call psb_errpush(info,name,i_err=(/istop_/))
|
||||
goto 9999
|
||||
end if
|
||||
!
|
||||
! istop_ = 1: normwise backward error, infinity norm
|
||||
! istop_ = 2: ||r||/||b|| norm 2
|
||||
!
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_,psb_istop_bn2_,&
|
||||
& psb_istop_rn2_abs_, psb_istop_rrn2_)
|
||||
! nothing needed
|
||||
case default
|
||||
! should never get here
|
||||
info=psb_err_internal_error_
|
||||
err=info
|
||||
call psb_errpush(info,name,a_err="invalid istop_")
|
||||
goto 9999
|
||||
end select
|
||||
|
||||
call psb_chkvect(mglob,lone,x%get_nrows(),lone,lone,desc_a,info)
|
||||
if (info == psb_success_)&
|
||||
& call psb_chkvect(mglob,lone,b%get_nrows(),lone,lone,desc_a,info)
|
||||
if(info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_
|
||||
call psb_errpush(info,name,a_err='psb_chkvect on X/B')
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
naux=4*n_col
|
||||
allocate(aux(naux), stat=info)
|
||||
if (info == psb_success_) call psb_geall(wwrk,desc_a,info,n=9_psb_ipk_)
|
||||
if (info == psb_success_) call psb_geasb(wwrk,desc_a,info,mold=x%v,scratch=.true.)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (present(itmax)) then
|
||||
itmax_ = itmax
|
||||
else
|
||||
itmax_ = 1000
|
||||
endif
|
||||
|
||||
if (present(itrace)) then
|
||||
itrace_ = itrace
|
||||
else
|
||||
itrace_ = 0
|
||||
end if
|
||||
|
||||
y => wwrk(1)
|
||||
r1 => wwrk(2)
|
||||
r2 => wwrk(3)
|
||||
v => wwrk(4)
|
||||
w => wwrk(5)
|
||||
w1 => wwrk(6)
|
||||
w2 => wwrk(7)
|
||||
wtmp => wwrk(8)
|
||||
res => wwrk(9)
|
||||
|
||||
do_cond = present(cond)
|
||||
epsmach = epsilon(sone)
|
||||
|
||||
! res = b - A*x
|
||||
call psb_geaxpby(sone,b,szero,res,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(-sone,a,x,sone,res,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
ani = psb_spnrmi(a,desc_a,info)
|
||||
bni = psb_geamax(b,desc_a,info)
|
||||
case(psb_istop_bn2_)
|
||||
bn2 = psb_genrm2(b,desc_a,info)
|
||||
case(psb_istop_rn2_abs_)
|
||||
! nothing needed
|
||||
case(psb_istop_rrn2_)
|
||||
r0n2 = psb_genrm2(res,desc_a,info)
|
||||
end select
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
errnum = szero
|
||||
errden = sone
|
||||
deps = eps
|
||||
converged = .false.
|
||||
if ((itrace_ > 0).and.(me == 0)) call log_header(methdname)
|
||||
|
||||
! y = beta1 * P' * v1, with v1 the first Lanczos vector.
|
||||
call psb_geaxpby(sone,res,szero,y,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(sone,res,szero,r1,desc_a,info)
|
||||
if (info == psb_success_) call prec%apply(res,y,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
dotv = psb_gedot(res,y,desc_a,info)
|
||||
if (dotv < -epsmach*max(sone,abs(dotv))) then
|
||||
info=psb_err_pivot_too_small_
|
||||
call psb_errpush(info,name,a_err='MINRES breakdown: negative (r,z)')
|
||||
goto 9999
|
||||
end if
|
||||
if (dotv < szero) dotv = szero
|
||||
beta1 = sqrt(dotv)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
! If beta1 is numerically zero, x is already acceptable.
|
||||
if (abs(beta1) <= epsmach) then
|
||||
itx = 0
|
||||
converged = .true.
|
||||
if (do_cond) cond = szero
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
rni = psb_geamax(res,desc_a,info)
|
||||
xni = psb_geamax(x,desc_a,info)
|
||||
errnum = rni
|
||||
errden = ani*xni + bni
|
||||
case(psb_istop_bn2_)
|
||||
errnum = abs(beta1)
|
||||
errden = bn2
|
||||
case(psb_istop_rn2_abs_)
|
||||
errnum = abs(beta1)
|
||||
errden = sone
|
||||
case(psb_istop_rrn2_)
|
||||
errnum = abs(beta1)
|
||||
errden = r0n2
|
||||
end select
|
||||
if (errden == szero) errden = sone
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
end if
|
||||
|
||||
beta = beta1
|
||||
oldb = szero
|
||||
dbar = szero
|
||||
epsln = szero
|
||||
phibar = beta1
|
||||
rhs1 = beta1
|
||||
rhs2 = szero
|
||||
cs = -sone
|
||||
sn = szero
|
||||
itx = 0
|
||||
|
||||
if (do_cond) then
|
||||
tnorm2 = 0.0_psb_spk_
|
||||
ynorm2 = 0.0_psb_spk_
|
||||
gmax = 0.0_psb_spk_
|
||||
gmin = huge(sone)
|
||||
end if
|
||||
|
||||
call psb_geaxpby(sone,r1,szero,r2,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(szero,x,szero,w,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(szero,x,szero,w1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(szero,x,szero,w2,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (.not.converged) then
|
||||
do while (itx < itmax_)
|
||||
if (abs(beta) <= epsmach) exit
|
||||
itx = itx + 1
|
||||
|
||||
s = sone/beta
|
||||
call psb_geaxpby(s,y,szero,v,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(sone,a,v,szero,y,desc_a,info,work=aux)
|
||||
if (itx >= 2 .and. info == psb_success_) then
|
||||
call psb_geaxpby((-beta/oldb),r1,sone,y,desc_a,info)
|
||||
end if
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
alfa = psb_gedot(v,y,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
call psb_geaxpby((-alfa/beta),r2,sone,y,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(sone,r2,szero,r1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(sone,y,szero,r2,desc_a,info)
|
||||
if (info == psb_success_) call prec%apply(r2,y,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
oldb = beta
|
||||
dotv = psb_gedot(r2,y,desc_a,info)
|
||||
if (dotv < -epsmach*max(sone,abs(dotv))) then
|
||||
info=psb_err_pivot_too_small_
|
||||
call psb_errpush(info,name,a_err='MINRES breakdown: negative (r2,z2)')
|
||||
goto 9999
|
||||
end if
|
||||
if (dotv < szero) dotv = szero
|
||||
beta = sqrt(dotv)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
tnorm2 = tnorm2 + abs(alfa)**2 + abs(oldb)**2 + abs(beta)**2
|
||||
if (itx == 1) then
|
||||
gmax = abs(alfa)
|
||||
gmin = gmax
|
||||
end if
|
||||
end if
|
||||
|
||||
oldeps = epsln
|
||||
delta = dbar
|
||||
gbar = alfa
|
||||
rotx(1) = delta
|
||||
roty(1) = gbar
|
||||
call srot(1,rotx,1,roty,1,cs,sn)
|
||||
delta = rotx(1)
|
||||
gbar = -roty(1)
|
||||
|
||||
epsln = szero
|
||||
dbar = beta
|
||||
rotx(1) = epsln
|
||||
roty(1) = dbar
|
||||
call srot(1,rotx,1,roty,1,cs,sn)
|
||||
epsln = rotx(1)
|
||||
dbar = -roty(1)
|
||||
|
||||
gamma = gbar
|
||||
betatmp = beta
|
||||
call srotg(gamma,betatmp,cs,sn)
|
||||
if (abs(gamma) <= epsmach) exit
|
||||
|
||||
phi = phibar
|
||||
phibar = szero
|
||||
rotx(1) = phi
|
||||
roty(1) = phibar
|
||||
call srot(1,rotx,1,roty,1,cs,-sn)
|
||||
phi = rotx(1)
|
||||
phibar = roty(1)
|
||||
|
||||
denom = sone/gamma
|
||||
call psb_geaxpby(sone,w2,szero,w1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(sone,w,szero,w2,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(sone,v,szero,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(-oldeps,w1,sone,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(-delta,w2,sone,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(denom,wtmp,szero,w,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(phi,w,sone,x,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
gmax = max(gmax,abs(gamma))
|
||||
gmin = min(gmin,abs(gamma))
|
||||
zeta = rhs1/gamma
|
||||
ynorm2 = ynorm2 + abs(zeta)**2
|
||||
rhs1 = rhs2 - delta*zeta
|
||||
rhs2 = -epsln*zeta
|
||||
end if
|
||||
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
! Compute true residual only for the ANI stopping criterion.
|
||||
call psb_geaxpby(sone,b,szero,res,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(-sone,a,x,sone,res,desc_a,info,work=aux)
|
||||
if (info == psb_success_) rni = psb_geamax(res,desc_a,info)
|
||||
if (info == psb_success_) xni = psb_geamax(x,desc_a,info)
|
||||
errnum = rni
|
||||
errden = ani*xni + bni
|
||||
case(psb_istop_bn2_)
|
||||
errnum = abs(phibar)
|
||||
errden = bn2
|
||||
case(psb_istop_rn2_abs_)
|
||||
errnum = abs(phibar)
|
||||
errden = sone
|
||||
case(psb_istop_rrn2_)
|
||||
errnum = abs(phibar)
|
||||
errden = r0n2
|
||||
end select
|
||||
if (errden == szero) errden = sone
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (itrace_ > 0) &
|
||||
& call log_conv(methdname,me,itx,itrace_,errnum,errden,deps)
|
||||
|
||||
if (errnum <= eps*errden) then
|
||||
converged = .true.
|
||||
exit
|
||||
end if
|
||||
end do
|
||||
end if
|
||||
|
||||
if ((.not.converged) .and. (itx >= itmax_)) then
|
||||
if (debug_level >= psb_debug_ext_)&
|
||||
& write(debug_unit,*) me,' ',trim(name),': MINRES reached iteration limit'
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
if (gmin > 0.0_psb_spk_) then
|
||||
cond = gmax/gmin
|
||||
else
|
||||
cond = huge(sone)
|
||||
end if
|
||||
end if
|
||||
|
||||
call log_end(methdname,me,itx,itrace_,errnum,errden,deps,err=derr,iter=iter)
|
||||
if (present(err)) err = derr
|
||||
|
||||
if (info == psb_success_) call psb_gefree(wwrk,desc_a,info)
|
||||
if (info == psb_success_) deallocate(aux,stat=info)
|
||||
if (info /= psb_success_) then
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
|
||||
call psb_erractionrestore(err_act)
|
||||
return
|
||||
|
||||
9999 call psb_error_handler(err_act)
|
||||
return
|
||||
|
||||
end subroutine psb_sminres_vect
|
||||
@ -0,0 +1,511 @@
|
||||
!
|
||||
! Parallel Sparse BLAS version 3.5
|
||||
! (C) Copyright 2006-2018
|
||||
! Salvatore Filippone
|
||||
! Alfredo Buttari
|
||||
!
|
||||
! Redistribution and use in source and binary forms, with or without
|
||||
! modification, are permitted provided that the following conditions
|
||||
! are met:
|
||||
! 1. Redistributions of source code must retain the above copyright
|
||||
! notice, this list of conditions and the following disclaimer.
|
||||
! 2. Redistributions in binary form must reproduce the above copyright
|
||||
! notice, this list of conditions, and the following disclaimer in the
|
||||
! documentation and/or other materials provided with the distribution.
|
||||
! 3. The name of the PSBLAS group or the names of its contributors may
|
||||
! not be used to endorse or promote products derived from this
|
||||
! software without specific prior written permission.
|
||||
!
|
||||
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||||
! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
|
||||
! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
! POSSIBILITY OF SUCH DAMAGE.
|
||||
!
|
||||
!
|
||||
! File: psb_zminres.f90
|
||||
! CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
|
||||
! C C
|
||||
! C References: C
|
||||
! C [1] Duff, I., Marrone, M., Radicati, G., and Vittoli, C. C
|
||||
! C Level 3 basic linear algebra subprograms for sparse C
|
||||
! C matrices: a user level interface C
|
||||
! C ACM Trans. Math. Softw., 23(3), 379-401, 1997. C
|
||||
! C C
|
||||
! C C
|
||||
! C [2] S. Filippone, M. Colajanni C
|
||||
! C PSBLAS: A library for parallel linear algebra C
|
||||
! C computation on sparse matrices C
|
||||
! C ACM Trans. on Math. Softw., 26(4), 527-550, Dec. 2000. C
|
||||
! C C
|
||||
! C [3] M. Arioli, I. Duff, M. Ruiz C
|
||||
! C Stopping criteria for iterative solvers C
|
||||
! C SIAM J. Matrix Anal. Appl., Vol. 13, pp. 138-144, 1992 C
|
||||
! C C
|
||||
! C C
|
||||
! C [4] R. Barrett et al C
|
||||
! C Templates for the solution of linear systems C
|
||||
! C SIAM, 1993
|
||||
! C C
|
||||
! C C
|
||||
! CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
|
||||
! File: psb_zminres.f90
|
||||
!
|
||||
! Subroutine: psb_zminres
|
||||
! This subroutine implements the MINRES method.
|
||||
!
|
||||
!
|
||||
! Arguments:
|
||||
!
|
||||
! a - type(psb_zspmat_type) Input: sparse matrix containing A.
|
||||
! prec - class(psb_zprec_type) Input: preconditioner
|
||||
! b(:) - complex Input: vector containing the
|
||||
! right hand side B
|
||||
! x(:) - complex Input/Output: vector containing the
|
||||
! initial guess and final solution X.
|
||||
! eps - real Input: Stopping tolerance; the iteration is
|
||||
! stopped when the error estimate |err| <= eps
|
||||
! desc_a - type(psb_desc_type). Input: The communication descriptor.
|
||||
! info - integer. Output: Return code
|
||||
!
|
||||
! itmax - integer(optional) Input: maximum number of iterations to be
|
||||
! performed.
|
||||
! iter - integer(optional) Output: how many iterations have been
|
||||
! performed.
|
||||
! performed.
|
||||
! err - real (optional) Output: error estimate on exit. If the
|
||||
! denominator of the estimate is exactly
|
||||
! 0, it is changed into 1.
|
||||
! itrace - integer(optional) Input: print an informational message
|
||||
! with the error estimate every itrace
|
||||
! iterations
|
||||
! istop - integer(optional) Input: stopping criterion, or how
|
||||
! to estimate the error.
|
||||
! 1: err = |r|/(|a||x|+|b|); here the iteration is
|
||||
! stopped when |r| <= eps * (|a||x|+|b|)
|
||||
! 2: err = |r|/|b|; here the iteration is
|
||||
! stopped when |r| <= eps * |b|
|
||||
! where r is the (preconditioned, recursive
|
||||
! estimate of) residual.
|
||||
!
|
||||
!
|
||||
subroutine psb_zminres_vect(a,prec,b,x,eps,desc_a,info,&
|
||||
& itmax,iter,err,itrace,istop,cond)
|
||||
use psb_base_mod
|
||||
use psb_prec_mod
|
||||
use psb_z_linsolve_conv_mod
|
||||
use psb_linsolve_mod
|
||||
implicit none
|
||||
type(psb_zspmat_type), intent(in) :: a
|
||||
Type(psb_desc_type), Intent(in) :: desc_a
|
||||
class(psb_zprec_type), intent(inout) :: prec
|
||||
type(psb_z_vect_type), Intent(inout) :: b
|
||||
type(psb_z_vect_type), Intent(inout) :: x
|
||||
Real(psb_dpk_), Intent(in) :: eps
|
||||
integer(psb_ipk_), intent(out) :: info
|
||||
integer(psb_ipk_), Optional, Intent(in) :: itmax, itrace, istop
|
||||
integer(psb_ipk_), Optional, Intent(out) :: iter
|
||||
Real(psb_dpk_), Optional, Intent(out) :: err, cond
|
||||
! = Local data
|
||||
complex(psb_dpk_), allocatable, target :: aux(:)
|
||||
type(psb_z_vect_type), allocatable, target :: wwrk(:)
|
||||
type(psb_z_vect_type), pointer :: y, r1, r2, v, w, w1, w2, wtmp, res
|
||||
complex(psb_dpk_) :: alfa, beta, beta1, dbar, delta, denom
|
||||
complex(psb_dpk_) :: epsln, gamma, gbar, oldb, oldeps, phi, phibar
|
||||
complex(psb_dpk_) :: rhs1, rhs2, s, zeta, betatmp
|
||||
complex(psb_dpk_) :: rotx(1), roty(1)
|
||||
real(psb_dpk_) :: cs
|
||||
complex(psb_dpk_) :: sn
|
||||
integer(psb_ipk_) :: itmax_, istop_, naux, itx, itrace_, n_col, n_row, err_act
|
||||
integer(psb_lpk_) :: mglob
|
||||
integer(psb_ipk_) :: debug_level, debug_unit
|
||||
type(psb_ctxt_type) :: ctxt
|
||||
integer(psb_ipk_) :: np, me
|
||||
real(psb_dpk_) :: derr, errnum, errden, deps
|
||||
logical :: do_cond
|
||||
logical :: converged
|
||||
real(psb_dpk_) :: epsmach
|
||||
real(psb_dpk_) :: gmax, gmin, tnorm2, ynorm2
|
||||
real(psb_dpk_) :: rni, xni, bni, ani, bn2, r0n2
|
||||
character(len=20) :: name
|
||||
character(len=*), parameter :: methdname='MINRES'
|
||||
|
||||
info = psb_success_
|
||||
name = 'psb_zminres'
|
||||
call psb_erractionsave(err_act)
|
||||
debug_unit = psb_get_debug_unit()
|
||||
debug_level = psb_get_debug_level()
|
||||
|
||||
ctxt = desc_a%get_context()
|
||||
|
||||
call psb_info(ctxt, me, np)
|
||||
if (.not.allocated(b%v)) then
|
||||
info = psb_err_invalid_vect_state_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
endif
|
||||
if (.not.allocated(x%v)) then
|
||||
info = psb_err_invalid_vect_state_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
endif
|
||||
|
||||
|
||||
mglob = desc_a%get_global_rows()
|
||||
n_row = desc_a%get_local_rows()
|
||||
n_col = desc_a%get_local_cols()
|
||||
|
||||
|
||||
if (present(istop)) then
|
||||
istop_ = istop
|
||||
else
|
||||
istop_ = psb_get_istop_default()
|
||||
endif
|
||||
if (.not.psb_is_valid_istop(istop_)) then
|
||||
info=psb_err_invalid_istop_
|
||||
err=info
|
||||
call psb_errpush(info,name,i_err=(/istop_/))
|
||||
goto 9999
|
||||
end if
|
||||
!
|
||||
! istop_ = 1: normwise backward error, infinity norm
|
||||
! istop_ = 2: ||r||/||b|| norm 2
|
||||
!
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_,psb_istop_bn2_,&
|
||||
& psb_istop_rn2_abs_, psb_istop_rrn2_)
|
||||
! nothing needed
|
||||
case default
|
||||
! should never get here
|
||||
info=psb_err_internal_error_
|
||||
err=info
|
||||
call psb_errpush(info,name,a_err="invalid istop_")
|
||||
goto 9999
|
||||
end select
|
||||
|
||||
call psb_chkvect(mglob,lone,x%get_nrows(),lone,lone,desc_a,info)
|
||||
if (info == psb_success_)&
|
||||
& call psb_chkvect(mglob,lone,b%get_nrows(),lone,lone,desc_a,info)
|
||||
if(info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_
|
||||
call psb_errpush(info,name,a_err='psb_chkvect on X/B')
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
naux=4*n_col
|
||||
allocate(aux(naux), stat=info)
|
||||
if (info == psb_success_) call psb_geall(wwrk,desc_a,info,n=9_psb_ipk_)
|
||||
if (info == psb_success_) call psb_geasb(wwrk,desc_a,info,mold=x%v,scratch=.true.)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (present(itmax)) then
|
||||
itmax_ = itmax
|
||||
else
|
||||
itmax_ = 1000
|
||||
endif
|
||||
|
||||
if (present(itrace)) then
|
||||
itrace_ = itrace
|
||||
else
|
||||
itrace_ = 0
|
||||
end if
|
||||
|
||||
y => wwrk(1)
|
||||
r1 => wwrk(2)
|
||||
r2 => wwrk(3)
|
||||
v => wwrk(4)
|
||||
w => wwrk(5)
|
||||
w1 => wwrk(6)
|
||||
w2 => wwrk(7)
|
||||
wtmp => wwrk(8)
|
||||
res => wwrk(9)
|
||||
|
||||
do_cond = present(cond)
|
||||
epsmach = epsilon(done)
|
||||
|
||||
! res = b - A*x
|
||||
call psb_geaxpby(zone,b,zzero,res,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(-zone,a,x,zone,res,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
ani = psb_spnrmi(a,desc_a,info)
|
||||
bni = psb_geamax(b,desc_a,info)
|
||||
case(psb_istop_bn2_)
|
||||
bn2 = psb_genrm2(b,desc_a,info)
|
||||
case(psb_istop_rn2_abs_)
|
||||
! nothing needed
|
||||
case(psb_istop_rrn2_)
|
||||
r0n2 = psb_genrm2(res,desc_a,info)
|
||||
end select
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
errnum = zzero
|
||||
errden = zone
|
||||
deps = eps
|
||||
converged = .false.
|
||||
if ((itrace_ > 0).and.(me == 0)) call log_header(methdname)
|
||||
|
||||
! y = beta1 * P' * v1, with v1 the first Lanczos vector.
|
||||
call psb_geaxpby(zone,res,zzero,y,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(zone,res,zzero,r1,desc_a,info)
|
||||
if (info == psb_success_) call prec%apply(res,y,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
beta1 = sqrt(psb_gedot(res,y,desc_a,info))
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
! If beta1 is numerically zero, x is already acceptable.
|
||||
if (abs(beta1) <= epsmach) then
|
||||
itx = 0
|
||||
converged = .true.
|
||||
if (do_cond) cond = dzero
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
rni = psb_geamax(res,desc_a,info)
|
||||
xni = psb_geamax(x,desc_a,info)
|
||||
errnum = rni
|
||||
errden = ani*xni + bni
|
||||
case(psb_istop_bn2_)
|
||||
errnum = abs(beta1)
|
||||
errden = bn2
|
||||
case(psb_istop_rn2_abs_)
|
||||
errnum = abs(beta1)
|
||||
errden = done
|
||||
case(psb_istop_rrn2_)
|
||||
errnum = abs(beta1)
|
||||
errden = r0n2
|
||||
end select
|
||||
if (errden == dzero) errden = done
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
end if
|
||||
|
||||
beta = beta1
|
||||
oldb = zzero
|
||||
dbar = zzero
|
||||
epsln = zzero
|
||||
phibar = beta1
|
||||
rhs1 = beta1
|
||||
rhs2 = zzero
|
||||
cs = -done
|
||||
sn = zzero
|
||||
itx = 0
|
||||
|
||||
if (do_cond) then
|
||||
tnorm2 = 0.0_psb_dpk_
|
||||
ynorm2 = 0.0_psb_dpk_
|
||||
gmax = 0.0_psb_dpk_
|
||||
gmin = huge(done)
|
||||
end if
|
||||
|
||||
call psb_geaxpby(zone,r1,zzero,r2,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(zzero,x,zzero,w,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(zzero,x,zzero,w1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(zzero,x,zzero,w2,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (.not.converged) then
|
||||
do while (itx < itmax_)
|
||||
if (abs(beta) <= epsmach) exit
|
||||
itx = itx + 1
|
||||
|
||||
s = zone/beta
|
||||
call psb_geaxpby(s,y,zzero,v,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(zone,a,v,zzero,y,desc_a,info,work=aux)
|
||||
if (itx >= 2 .and. info == psb_success_) then
|
||||
call psb_geaxpby((-beta/oldb),r1,zone,y,desc_a,info)
|
||||
end if
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
alfa = psb_gedot(v,y,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
call psb_geaxpby((-alfa/beta),r2,zone,y,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(zone,r2,zzero,r1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(zone,y,zzero,r2,desc_a,info)
|
||||
if (info == psb_success_) call prec%apply(r2,y,desc_a,info,work=aux)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
oldb = beta
|
||||
beta = sqrt(psb_gedot(r2,y,desc_a,info))
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
tnorm2 = tnorm2 + abs(alfa)**2 + abs(oldb)**2 + abs(beta)**2
|
||||
if (itx == 1) then
|
||||
gmax = abs(alfa)
|
||||
gmin = gmax
|
||||
end if
|
||||
end if
|
||||
|
||||
oldeps = epsln
|
||||
delta = dbar
|
||||
gbar = alfa
|
||||
rotx(1) = delta
|
||||
roty(1) = gbar
|
||||
call zrot(1,rotx,1,roty,1,cs,sn)
|
||||
delta = rotx(1)
|
||||
gbar = -roty(1)
|
||||
|
||||
epsln = zzero
|
||||
dbar = beta
|
||||
rotx(1) = epsln
|
||||
roty(1) = dbar
|
||||
call zrot(1,rotx,1,roty,1,cs,sn)
|
||||
epsln = rotx(1)
|
||||
dbar = -roty(1)
|
||||
|
||||
gamma = gbar
|
||||
betatmp = beta
|
||||
call zrotg(gamma,betatmp,cs,sn)
|
||||
if (abs(gamma) <= epsmach) exit
|
||||
|
||||
phi = phibar
|
||||
phibar = zzero
|
||||
rotx(1) = phi
|
||||
roty(1) = phibar
|
||||
call zrot(1,rotx,1,roty,1,cs,-sn)
|
||||
phi = rotx(1)
|
||||
phibar = roty(1)
|
||||
|
||||
denom = zone/gamma
|
||||
call psb_geaxpby(zone,w2,zzero,w1,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(zone,w,zzero,w2,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(zone,v,zzero,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(-oldeps,w1,zone,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(-delta,w2,zone,wtmp,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(denom,wtmp,zzero,w,desc_a,info)
|
||||
if (info == psb_success_) call psb_geaxpby(phi,w,zone,x,desc_a,info)
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
gmax = max(gmax,abs(gamma))
|
||||
gmin = min(gmin,abs(gamma))
|
||||
zeta = rhs1/gamma
|
||||
ynorm2 = ynorm2 + abs(zeta)**2
|
||||
rhs1 = rhs2 - delta*zeta
|
||||
rhs2 = -epsln*zeta
|
||||
end if
|
||||
|
||||
select case(istop_)
|
||||
case(psb_istop_ani_)
|
||||
! Compute true residual only for the ANI stopping criterion.
|
||||
call psb_geaxpby(zone,b,zzero,res,desc_a,info)
|
||||
if (info == psb_success_) call psb_spmm(-zone,a,x,zone,res,desc_a,info,work=aux)
|
||||
if (info == psb_success_) rni = psb_geamax(res,desc_a,info)
|
||||
if (info == psb_success_) xni = psb_geamax(x,desc_a,info)
|
||||
errnum = rni
|
||||
errden = ani*xni + bni
|
||||
case(psb_istop_bn2_)
|
||||
errnum = abs(phibar)
|
||||
errden = bn2
|
||||
case(psb_istop_rn2_abs_)
|
||||
errnum = abs(phibar)
|
||||
errden = done
|
||||
case(psb_istop_rrn2_)
|
||||
errnum = abs(phibar)
|
||||
errden = r0n2
|
||||
end select
|
||||
if (errden == dzero) errden = done
|
||||
if (info /= psb_success_) then
|
||||
info=psb_err_from_subroutine_non_
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
if (itrace_ > 0) &
|
||||
& call log_conv(methdname,me,itx,itrace_,errnum,errden,deps)
|
||||
|
||||
if (errnum <= eps*errden) then
|
||||
converged = .true.
|
||||
exit
|
||||
end if
|
||||
end do
|
||||
end if
|
||||
|
||||
if ((.not.converged) .and. (itx >= itmax_)) then
|
||||
if (debug_level >= psb_debug_ext_)&
|
||||
& write(debug_unit,*) me,' ',trim(name),': MINRES reached iteration limit'
|
||||
end if
|
||||
|
||||
if (do_cond) then
|
||||
if (gmin > 0.0_psb_dpk_) then
|
||||
cond = gmax/gmin
|
||||
else
|
||||
cond = huge(done)
|
||||
end if
|
||||
end if
|
||||
|
||||
call log_end(methdname,me,itx,itrace_,errnum,errden,deps,err=derr,iter=iter)
|
||||
if (present(err)) err = derr
|
||||
|
||||
if (info == psb_success_) call psb_gefree(wwrk,desc_a,info)
|
||||
if (info == psb_success_) deallocate(aux,stat=info)
|
||||
if (info /= psb_success_) then
|
||||
call psb_errpush(info,name)
|
||||
goto 9999
|
||||
end if
|
||||
|
||||
|
||||
call psb_erractionrestore(err_act)
|
||||
return
|
||||
|
||||
9999 call psb_error_handler(err_act)
|
||||
return
|
||||
|
||||
end subroutine psb_zminres_vect
|
||||
@ -0,0 +1,328 @@
|
||||
!
|
||||
! Parallel Sparse BLAS version 3.5
|
||||
! (C) Copyright 2006-2018
|
||||
! Salvatore Filippone
|
||||
! Alfredo Buttari
|
||||
!
|
||||
! Redistribution and use in source and binary forms, with or without
|
||||
! modification, are permitted provided that the following conditions
|
||||
! are met:
|
||||
! 1. Redistributions of source code must retain the above copyright
|
||||
! notice, this list of conditions and the following disclaimer.
|
||||
! 2. Redistributions in binary form must reproduce the above copyright
|
||||
! notice, this list of conditions, and the following disclaimer in the
|
||||
! documentation and/or other materials provided with the distribution.
|
||||
! 3. The name of the PSBLAS group or the names of its contributors may
|
||||
! not be used to endorse or promote products derived from this
|
||||
! software without specific prior written permission.
|
||||
!
|
||||
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||||
! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||
! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
|
||||
! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
! POSSIBILITY OF SUCH DAMAGE.
|
||||
!
|
||||
!
|
||||
subroutine mm_ivet_read(b, info, iunit, filename)
|
||||
use psb_base_mod
|
||||
implicit none
|
||||
integer(psb_ipk_), allocatable, intent(out) :: b(:)
|
||||
integer(psb_ipk_), intent(out) :: info
|
||||
integer(psb_ipk_), optional, intent(in) :: iunit
|
||||
character(len=*), optional, intent(in) :: filename
|
||||
integer(psb_ipk_) :: nrow, ncol, i,root, np, me, ircode, j, infile
|
||||
character :: mmheader*15, fmt*15, object*10, type*10, sym*15,&
|
||||
& line*1024
|
||||
logical :: opened
|
||||
|
||||
info = psb_success_
|
||||
opened = .false.
|
||||
if (present(filename)) then
|
||||
if (filename == '-') then
|
||||
infile=5
|
||||
else
|
||||
if (present(iunit)) then
|
||||
infile=iunit
|
||||
else
|
||||
infile=99
|
||||
endif
|
||||
open(infile,file=filename, status='OLD', err=901, action='READ')
|
||||
opened = .true.
|
||||
endif
|
||||
else
|
||||
if (present(iunit)) then
|
||||
infile=iunit
|
||||
else
|
||||
infile=5
|
||||
endif
|
||||
endif
|
||||
|
||||
read(infile,fmt=*, end=902) mmheader, object, fmt, type, sym
|
||||
|
||||
if ( (object /= 'matrix').or.(fmt /= 'array')) then
|
||||
write(psb_err_unit,*) 'read_rhs: input file type not yet supported'
|
||||
info = -3
|
||||
return
|
||||
end if
|
||||
|
||||
do
|
||||
read(infile,fmt='(a)') line
|
||||
if (line(1:1) /= '%') exit
|
||||
end do
|
||||
|
||||
read(line,fmt=*)nrow,ncol
|
||||
|
||||
if ((psb_tolower(type) == 'real').and.(psb_tolower(sym) == 'general')) then
|
||||
allocate(b(nrow),stat = ircode)
|
||||
if (ircode /= 0) goto 993
|
||||
do i=1,nrow
|
||||
read(infile,fmt=*,end=902) b(i)
|
||||
end do
|
||||
|
||||
end if ! read right hand sides
|
||||
if (opened) close(infile)
|
||||
|
||||
return
|
||||
! open failed
|
||||
901 write(psb_err_unit,*) 'mm_vet_read: could not open file ',&
|
||||
& infile,' for input'
|
||||
info = -1
|
||||
return
|
||||
|
||||
902 write(psb_err_unit,*) 'mmv_vet_read: unexpected end of file ',infile,&
|
||||
& ' during input'
|
||||
info = -2
|
||||
return
|
||||
993 write(psb_err_unit,*) 'mm_vet_read: memory allocation failure'
|
||||
info = -3
|
||||
return
|
||||
end subroutine mm_ivet_read
|
||||
|
||||
subroutine mm_ivet2_read(b, info, iunit, filename)
|
||||
use psb_base_mod
|
||||
implicit none
|
||||
integer(psb_ipk_), allocatable, intent(out) :: b(:,:)
|
||||
integer(psb_ipk_), intent(out) :: info
|
||||
integer(psb_ipk_), optional, intent(in) :: iunit
|
||||
character(len=*), optional, intent(in) :: filename
|
||||
integer(psb_ipk_) :: nrow, ncol, i,root, np, me, ircode, j, infile
|
||||
character :: mmheader*15, fmt*15, object*10, type*10, sym*15,&
|
||||
& line*1024
|
||||
logical :: opened
|
||||
|
||||
info = psb_success_
|
||||
opened = .false.
|
||||
if (present(filename)) then
|
||||
if (filename == '-') then
|
||||
infile=5
|
||||
else
|
||||
if (present(iunit)) then
|
||||
infile=iunit
|
||||
else
|
||||
infile=99
|
||||
endif
|
||||
open(infile,file=filename, status='OLD', err=901, action='READ')
|
||||
opened = .true.
|
||||
endif
|
||||
else
|
||||
if (present(iunit)) then
|
||||
infile=iunit
|
||||
else
|
||||
infile=5
|
||||
endif
|
||||
endif
|
||||
|
||||
read(infile,fmt=*, end=902) mmheader, object, fmt, type, sym
|
||||
|
||||
if ( (object /= 'matrix').or.(fmt /= 'array')) then
|
||||
write(psb_err_unit,*) 'read_rhs: input file type not yet supported'
|
||||
info = -3
|
||||
return
|
||||
end if
|
||||
|
||||
do
|
||||
read(infile,fmt='(a)') line
|
||||
if (line(1:1) /= '%') exit
|
||||
end do
|
||||
|
||||
read(line,fmt=*)nrow,ncol
|
||||
|
||||
if ((psb_tolower(type) == 'real').and.(psb_tolower(sym) == 'general')) then
|
||||
allocate(b(nrow,ncol),stat = ircode)
|
||||
if (ircode /= 0) goto 993
|
||||
read(infile,fmt=*,end=902) ((b(i,j), i=1,nrow),j=1,ncol)
|
||||
|
||||
end if ! read right hand sides
|
||||
if (opened) close(infile)
|
||||
|
||||
return
|
||||
! open failed
|
||||
901 write(psb_err_unit,*) 'mm_vet_read: could not open file ',&
|
||||
& infile,' for input'
|
||||
info = -1
|
||||
return
|
||||
|
||||
902 write(psb_err_unit,*) 'mmv_vet_read: unexpected end of file ',infile,&
|
||||
& ' during input'
|
||||
info = -2
|
||||
return
|
||||
993 write(psb_err_unit,*) 'mm_vet_read: memory allocation failure'
|
||||
info = -3
|
||||
return
|
||||
end subroutine mm_ivet2_read
|
||||
|
||||
subroutine mm_ivet2_write(b, header, info, iunit, filename)
|
||||
use psb_base_mod
|
||||
implicit none
|
||||
integer(psb_ipk_), intent(in) :: b(:,:)
|
||||
character(len=*), intent(in) :: header
|
||||
integer(psb_ipk_), intent(out) :: info
|
||||
integer(psb_ipk_), optional, intent(in) :: iunit
|
||||
character(len=*), optional, intent(in) :: filename
|
||||
integer(psb_ipk_) :: nrow, ncol, i,root, np, me, ircode, j, outfile
|
||||
|
||||
character(len=80) :: frmtv
|
||||
logical :: opened
|
||||
|
||||
info = psb_success_
|
||||
opened = .false.
|
||||
if (present(filename)) then
|
||||
if (filename == '-') then
|
||||
outfile=6
|
||||
else
|
||||
if (present(iunit)) then
|
||||
outfile=iunit
|
||||
else
|
||||
outfile=99
|
||||
endif
|
||||
open(outfile,file=filename, err=901, action='WRITE')
|
||||
opened = .true.
|
||||
endif
|
||||
else
|
||||
if (present(iunit)) then
|
||||
outfile=iunit
|
||||
else
|
||||
outfile=6
|
||||
endif
|
||||
endif
|
||||
|
||||
write(outfile,'(a)') '%%MatrixMarket matrix array real general'
|
||||
write(outfile,'(a)') '% '//trim(header)
|
||||
write(outfile,'(a)') '% '
|
||||
nrow = size(b,1)
|
||||
ncol = size(b,2)
|
||||
write(outfile,*) nrow, ncol
|
||||
|
||||
write(frmtv,'(a,i0,a)') '(',ncol,'(es26.18,1x))'
|
||||
|
||||
write(outfile,fmt=frmtv) ((b(i,j), i=1,nrow),j=1,ncol)
|
||||
|
||||
if (opened) close(outfile)
|
||||
|
||||
return
|
||||
! open failed
|
||||
901 write(psb_err_unit,*) 'mm_vet_write: could not open file ',&
|
||||
& outfile,' for output'
|
||||
info = -1
|
||||
return
|
||||
|
||||
end subroutine mm_ivet2_write
|
||||
|
||||
subroutine mm_ivet1_write(b, header, info, iunit, filename)
|
||||
use psb_base_mod
|
||||
implicit none
|
||||
integer(psb_ipk_), intent(in) :: b(:)
|
||||
character(len=*), intent(in) :: header
|
||||
integer(psb_ipk_), intent(out) :: info
|
||||
integer(psb_ipk_), optional, intent(in) :: iunit
|
||||
character(len=*), optional, intent(in) :: filename
|
||||
integer(psb_ipk_) :: nrow, ncol, i,root, np, me, ircode, j, outfile
|
||||
|
||||
character(len=80) :: frmtv
|
||||
logical :: opened
|
||||
|
||||
info = psb_success_
|
||||
opened = .false.
|
||||
if (present(filename)) then
|
||||
if (filename == '-') then
|
||||
outfile=6
|
||||
else
|
||||
if (present(iunit)) then
|
||||
outfile=iunit
|
||||
else
|
||||
outfile=99
|
||||
endif
|
||||
open(outfile,file=filename, err=901, action='WRITE')
|
||||
opened = .true.
|
||||
endif
|
||||
else
|
||||
if (present(iunit)) then
|
||||
outfile=iunit
|
||||
else
|
||||
outfile=6
|
||||
endif
|
||||
endif
|
||||
|
||||
write(outfile,'(a)') '%%MatrixMarket matrix array real general'
|
||||
write(outfile,'(a)') '% '//trim(header)
|
||||
write(outfile,'(a)') '% '
|
||||
nrow = size(b,1)
|
||||
ncol = 1
|
||||
write(outfile,*) nrow,ncol
|
||||
|
||||
write(frmtv,'(a,i0,a)') '(',ncol,'(es26.18,1x))'
|
||||
|
||||
do i=1,size(b,1)
|
||||
write(outfile,frmtv) b(i)
|
||||
end do
|
||||
|
||||
if (opened) close(outfile)
|
||||
|
||||
return
|
||||
! open failed
|
||||
901 write(psb_err_unit,*) 'mm_vet_write: could not open file ',&
|
||||
& outfile,' for output'
|
||||
info = -1
|
||||
return
|
||||
|
||||
end subroutine mm_ivet1_write
|
||||
|
||||
subroutine mm_ivect_read(b, info, iunit, filename)
|
||||
use psb_base_mod
|
||||
use psb_mmio_mod, psb_protect_name => mm_ivect_read
|
||||
implicit none
|
||||
type(psb_i_vect_type), intent(inout) :: b
|
||||
integer(psb_ipk_), intent(out) :: info
|
||||
integer(psb_ipk_), optional, intent(in) :: iunit
|
||||
character(len=*), optional, intent(in) :: filename
|
||||
!
|
||||
integer(psb_ipk_), allocatable :: bv(:)
|
||||
|
||||
call mm_array_read(bv, info, iunit, filename)
|
||||
if (info == 0) call b%bld(bv)
|
||||
|
||||
end subroutine mm_ivect_read
|
||||
|
||||
subroutine mm_ivect_write(b, header, info, iunit, filename)
|
||||
use psb_base_mod
|
||||
use psb_mmio_mod, psb_protect_name => mm_ivect_write
|
||||
implicit none
|
||||
type(psb_i_vect_type), intent(inout) :: b
|
||||
character(len=*), intent(in) :: header
|
||||
integer(psb_ipk_), intent(out) :: info
|
||||
integer(psb_ipk_), optional, intent(in) :: iunit
|
||||
character(len=*), optional, intent(in) :: filename
|
||||
info = psb_success_
|
||||
if (.not.allocated(b%v)) return
|
||||
call b%sync()
|
||||
|
||||
call mm_array_write(b%v%v,header,info,iunit,filename)
|
||||
|
||||
end subroutine mm_ivect_write
|
||||
|
||||
Loading…
Reference in New Issue