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Change handling of stopping criterion, refactor GMRES

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sfilippone
2026-06-05 15:53:51 +02:00
parent 014abc941c
commit d99e759fd1
33 changed files with 1156 additions and 473 deletions
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linsolve/impl/psb_cbicg.f90
+18 -8
View File
@@ -160,19 +160,29 @@ subroutine psb_cbicg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! istop_ = 1: normwise backward error, infinity norm
! istop_ = 2: ||r||/||b|| norm 2
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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_) then
linsolve/impl/psb_ccg.F90
+22 -1
View File
@@ -159,8 +159,29 @@ subroutine psb_ccg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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_)&
linsolve/impl/psb_ccgs.f90
+22 -1
View File
@@ -154,8 +154,29 @@ Subroutine psb_ccgs_vect(a,prec,b,x,eps,desc_a,info,&
If (Present(istop)) Then
istop_ = istop
Else
istop_ = 2
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)
linsolve/impl/psb_ccgstab.f90
+23 -5
View File
@@ -156,13 +156,31 @@ Subroutine psb_ccgstab_vect(a,prec,b,x,eps,desc_a,info,itmax,iter,err,itrace,ist
If (Present(istop)) Then
istop_ = istop
Else
istop_ = 2
Endif
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
! 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
! = if (.not.same_type_as(x,b)) then
! = write(0,*) 'Warning: different dynamic types for X and B '
! = end if
linsolve/impl/psb_ccgstabl.f90
+22 -1
View File
@@ -172,8 +172,29 @@ Subroutine psb_ccgstabl_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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
if (present(itmax)) then
itmax_ = itmax
linsolve/impl/psb_cfcg.F90
+22 -2
View File
@@ -164,9 +164,29 @@ subroutine psb_cfcg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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_)&
linsolve/impl/psb_cgcr.f90
+19 -11
View File
@@ -167,22 +167,30 @@ subroutine psb_cgcr_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! ISTOP_ = 1: Normwise backward error, infinity norm
! ISTOP_ = 2: ||r||/||b||, 2-norm
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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)
linsolve/impl/psb_crgmres.f90
+133 -89
View File
@@ -97,7 +97,8 @@
! iterations
! istop - integer(optional) Input: stopping criterion, or how
! to estimate the error.
! 1: err = |r|/(|a||x|+|b|); here the iteration is
! 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|
@@ -130,7 +131,7 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
type(psb_c_vect_type) :: w, w1, xt
real(psb_spk_) :: tmp
complex(psb_spk_) :: scal, gm, rti, rti1
integer(psb_ipk_) ::litmax, naux, it, k, itrace_,&
integer(psb_ipk_) ::itmax_, naux, it, k, itrace_,&
& n_row, n_col, nl
integer(psb_lpk_) :: mglob
Logical, Parameter :: exchange=.True., noexchange=.False., use_srot=.true.
@@ -172,24 +173,35 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! ISTOP_ = 1: Normwise backward error, infinity norm
! ISTOP_ = 2: ||r||/||b||, 2-norm
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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
if (present(itmax)) then
litmax = itmax
itmax_ = itmax
else
litmax = 1000
itmax_ = 1000
endif
if (present(itrace)) then
@@ -253,12 +265,15 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
& w%get_nrows(),w1%get_nrows()
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
ani = psb_spnrmi(a,desc_a,info)
bni = psb_geamax(b,desc_a,info)
else if (istop_ == 2) then
bn2 = psb_genrm2(b,desc_a,info)
else if (istop_ == 3) then
case(psb_istop_bn2_)
bn2 = psb_genrm2(b,desc_a,info)
case(psb_istop_rn2_abs_)
! do nothing
case(psb_istop_rrn2_)
call psb_geaxpby(cone,b,czero,v(1),desc_a,info)
if (info /= psb_success_) then
info=psb_err_from_subroutine_non_
@@ -273,7 +288,8 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
goto 9999
end if
r0n2 = psb_genrm2(v(1),desc_a,info)
endif
end select
errnum = czero
errden = cone
deps = eps
@@ -324,27 +340,32 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
!
! check convergence
!
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
rni = psb_geamax(v(1),desc_a,info)
xni = psb_geamax(x,desc_a,info)
errnum = rni
errden = (ani*xni+bni)
else if (istop_ == 2) then
case(psb_istop_bn2_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = bn2
else if (istop_ == 3) then
case(psb_istop_rn2_abs_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = sone
case(psb_istop_rrn2_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = r0n2
endif
end select
if (info /= psb_success_) then
info=psb_err_from_subroutine_non_
call psb_errpush(info,name)
goto 9999
end if
if ((errnum <= eps*errden).or.(itx >= litmax)) exit restart
if ((errnum <= eps*errden).or.(itx >= itmax_)) exit restart
if (itrace_ > 0) &
& call log_conv(methdname,me,itx,itrace_,errnum,errden,deps)
@@ -360,42 +381,18 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
call prec%apply(v(i),w1,desc_a,info)
call psb_spmm(cone,a,w1,czero,w,desc_a,info,work=aux)
!
call mgs(i,h,v,w,rs,c,s,desc_a,info)
do k = 1, i
h(k,i) = psb_gedot(v(k),w,desc_a,info)
call psb_geaxpby(-h(k,i),v(k),cone,w,desc_a,info)
end do
h(i+1,i) = psb_genrm2(w,desc_a,info)
scal=cone/h(i+1,i)
call psb_geaxpby(scal,w,czero,v(i+1),desc_a,info)
do k=2,i
call crot(1,h(k-1,i),1,h(k,i),1,real(c(k-1),kind=psb_spk_),s(k-1))
enddo
rti = h(i,i)
rti1 = h(i+1,i)
call crotg(rti,rti1,tmp,s(i))
c(i) = cmplx(tmp,szero)
call crot(1,h(i,i),1,h(i+1,i),1,real(c(i),kind=psb_spk_),s(i))
h(i+1,i) = czero
call crot(1,rs(i),1,rs(i+1),1,real(c(i),kind=psb_spk_),s(i))
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
!
! build x and then compute the residual and its infinity norm
!
rst = rs
call w1%set(czero)
call ctrsm('l','u','n','n',i,1,cone,h,size(h,1),rst,size(rst,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rst(1:i)
do k=1, i
call psb_geaxpby(rst(k),v(k),cone,xt,desc_a,info)
end do
call prec%apply(xt,desc_a,info)
call psb_geaxpby(cone,x,cone,xt,desc_a,info)
call psb_geaxpby(cone,x,czero,xt,desc_a,info)
call rebuildx(i,h,v,w,w1,xt,rst,c,s,prec,desc_a,info)
call psb_geaxpby(cone,b,czero,w1,desc_a,info)
call psb_spmm(-cone,a,xt,cone,w1,desc_a,info,work=aux)
rni = psb_geamax(w1,desc_a,info)
@@ -403,8 +400,7 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
errnum = rni
errden = (ani*xni+bni)
!
else if (istop_ == 2) then
case(psb_istop_bn2_)
!
! compute the residual 2-norm as byproduct of the solution
! procedure of the least-squares problem
@@ -412,7 +408,14 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
rni = abs(rs(i+1))
errnum = rni
errden = bn2
else if (istop_ == 3) then
case(psb_istop_rn2_abs_)
rni = abs(rs(i+1))
errnum = rni
errden = sone
case(psb_istop_rrn2_)
!
! compute the residual 2-norm as byproduct of the solution
! procedure of the least-squares problem
@@ -420,28 +423,18 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
rni = abs(rs(i+1))
errnum = rni
errden = r0n2
endif
end select
if (errnum <= eps*errden) then
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
call psb_geaxpby(cone,xt,czero,x,desc_a,info)
! = x = xt
else if (istop_ == 2) then
!
! build x
!
call ctrsm('l','u','n','n',i,1,cone,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:i)
call w1%set(czero)
do k=1, i
call psb_geaxpby(rs(k),v(k),cone,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(cone,w,cone,x,desc_a,info)
end if
case(psb_istop_bn2_, psb_istop_rn2_abs_,psb_istop_rrn2_)
call rebuildx(i,h,v,w,w1,x,rs,c,s,prec,desc_a,info) !
end select
if (itrace_ > 0) &
& call log_conv(methdname,me,itx,ione,errnum,errden,deps)
@@ -454,25 +447,15 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
end do inner
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
call psb_geaxpby(cone,xt,czero,x,desc_a,info)! x = xt
else if (istop_ == 2) then
!
! build x
!
call ctrsm('l','u','n','n',nl,1,cone,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:nl)
call w1%set(czero)
do k=1, nl
call psb_geaxpby(rs(k),v(k),cone,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(cone,w,cone,x,desc_a,info)
end if
case(psb_istop_bn2_, psb_istop_rn2_abs_,psb_istop_rrn2_)
call rebuildx(nl,h,v,w,w1,x,rs,c,s,prec,desc_a,info) !
end select
if (itx >= litmax) then
if (itx >= itmax_) then
if (itrace_ > 0) then
if (mod(itx,itrace_)/=0) &
& call log_conv(methdname,me,itx,ione,errnum,errden,deps)
@@ -502,6 +485,67 @@ subroutine psb_crgmres_vect(a,prec,b,x,eps,desc_a,info,&
9999 call psb_error_handler(err_act)
return
contains
!
! Advance one step the Gram-Schmidt process, and apply
! Givens rotations to keep H triangular
!
subroutine mgs(n,h,v,w,rs,c,s,desc_a,info)
complex(psb_spk_) :: c(:), s(:), h(:,:), rs(:)
type(psb_c_vect_type) :: v(:), w
type(psb_desc_type) :: desc_a
complex(psb_spk_) :: scal, gm, rti, rti1
real(psb_spk_) :: tmp
integer(psb_ipk_) :: info
integer(psb_ipk_) :: k,n
!
do k = 1, n
h(k,n) = psb_gedot(v(k),w,desc_a,info)
call psb_geaxpby(-h(k,n),v(k),cone,w,desc_a,info)
end do
h(n+1,n) = psb_genrm2(w,desc_a,info)
scal=cone/h(n+1,n)
call psb_geaxpby(scal,w,czero,v(n+1),desc_a,info)
do k=2,n
call crot(1,h(k-1:k-1,n),1,h(k:k,n),1,real(c(k-1),kind=psb_spk_),s(k-1))
enddo
rti = h(n,n)
rti1 = h(n+1,n)
call crotg(rti,rti1,tmp,s(n))
c(n) = cmplx(tmp,szero)
call crot(1,h(n:n,n),1,h(n+1:n+1,n),1,real(c(n),kind=psb_spk_),s(n))
call crot(1,rs(n:n),1,rs(n+1:n+1),1,real(c(n),kind=psb_spk_),s(n))
end subroutine mgs
!
! Rebuild solution X from the space V using the factor
! stored in R
!
subroutine rebuildx(n,h,v,w,w1,x,rs,c,s,prec,desc_a,info)
complex(psb_spk_) :: c(:), s(:), rs(:), h(:,:)
type(psb_c_vect_type) :: v(:), w, w1, x
type(psb_desc_type) :: desc_a
class(psb_cprec_type) :: prec
integer(psb_ipk_) :: info
integer(psb_ipk_) :: k,n
!
!
! build x
!
call ctrsm('l','u','n','n',n,1,cone,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:n)
call w1%zero()
do k=1, n
call psb_geaxpby(rs(k),v(k),cone,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(cone,w,cone,x,desc_a,info)
end subroutine rebuildx
end subroutine psb_crgmres_vect
linsolve/impl/psb_dbicg.f90
+18 -8
View File
@@ -160,19 +160,29 @@ subroutine psb_dbicg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! istop_ = 1: normwise backward error, infinity norm
! istop_ = 2: ||r||/||b|| norm 2
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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_) then
linsolve/impl/psb_dcg.F90
+22 -1
View File
@@ -159,8 +159,29 @@ subroutine psb_dcg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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_)&
linsolve/impl/psb_dcgs.f90
+22 -1
View File
@@ -154,8 +154,29 @@ Subroutine psb_dcgs_vect(a,prec,b,x,eps,desc_a,info,&
If (Present(istop)) Then
istop_ = istop
Else
istop_ = 2
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)
linsolve/impl/psb_dcgstab.f90
+23 -5
View File
@@ -156,13 +156,31 @@ Subroutine psb_dcgstab_vect(a,prec,b,x,eps,desc_a,info,itmax,iter,err,itrace,ist
If (Present(istop)) Then
istop_ = istop
Else
istop_ = 2
Endif
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
! 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
! = if (.not.same_type_as(x,b)) then
! = write(0,*) 'Warning: different dynamic types for X and B '
! = end if
linsolve/impl/psb_dcgstabl.f90
+22 -1
View File
@@ -172,8 +172,29 @@ Subroutine psb_dcgstabl_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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
if (present(itmax)) then
itmax_ = itmax
linsolve/impl/psb_dfcg.F90
+22 -2
View File
@@ -164,9 +164,29 @@ subroutine psb_dfcg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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_)&
linsolve/impl/psb_dgcr.f90
+19 -11
View File
@@ -167,22 +167,30 @@ subroutine psb_dgcr_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! ISTOP_ = 1: Normwise backward error, infinity norm
! ISTOP_ = 2: ||r||/||b||, 2-norm
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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)
linsolve/impl/psb_drgmres.f90
+133 -89
View File
@@ -97,7 +97,8 @@
! iterations
! istop - integer(optional) Input: stopping criterion, or how
! to estimate the error.
! 1: err = |r|/(|a||x|+|b|); here the iteration is
! 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|
@@ -130,7 +131,7 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
type(psb_d_vect_type) :: w, w1, xt
real(psb_dpk_) :: tmp
real(psb_dpk_) :: scal, gm, rti, rti1
integer(psb_ipk_) ::litmax, naux, it, k, itrace_,&
integer(psb_ipk_) ::itmax_, naux, it, k, itrace_,&
& n_row, n_col, nl
integer(psb_lpk_) :: mglob
Logical, Parameter :: exchange=.True., noexchange=.False., use_srot=.true.
@@ -172,24 +173,35 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! ISTOP_ = 1: Normwise backward error, infinity norm
! ISTOP_ = 2: ||r||/||b||, 2-norm
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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
if (present(itmax)) then
litmax = itmax
itmax_ = itmax
else
litmax = 1000
itmax_ = 1000
endif
if (present(itrace)) then
@@ -253,12 +265,15 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
& w%get_nrows(),w1%get_nrows()
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
ani = psb_spnrmi(a,desc_a,info)
bni = psb_geamax(b,desc_a,info)
else if (istop_ == 2) then
bn2 = psb_genrm2(b,desc_a,info)
else if (istop_ == 3) then
case(psb_istop_bn2_)
bn2 = psb_genrm2(b,desc_a,info)
case(psb_istop_rn2_abs_)
! do nothing
case(psb_istop_rrn2_)
call psb_geaxpby(done,b,dzero,v(1),desc_a,info)
if (info /= psb_success_) then
info=psb_err_from_subroutine_non_
@@ -273,7 +288,8 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
goto 9999
end if
r0n2 = psb_genrm2(v(1),desc_a,info)
endif
end select
errnum = dzero
errden = done
deps = eps
@@ -324,27 +340,32 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
!
! check convergence
!
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
rni = psb_geamax(v(1),desc_a,info)
xni = psb_geamax(x,desc_a,info)
errnum = rni
errden = (ani*xni+bni)
else if (istop_ == 2) then
case(psb_istop_bn2_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = bn2
else if (istop_ == 3) then
case(psb_istop_rn2_abs_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = done
case(psb_istop_rrn2_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = r0n2
endif
end select
if (info /= psb_success_) then
info=psb_err_from_subroutine_non_
call psb_errpush(info,name)
goto 9999
end if
if ((errnum <= eps*errden).or.(itx >= litmax)) exit restart
if ((errnum <= eps*errden).or.(itx >= itmax_)) exit restart
if (itrace_ > 0) &
& call log_conv(methdname,me,itx,itrace_,errnum,errden,deps)
@@ -360,42 +381,18 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
call prec%apply(v(i),w1,desc_a,info)
call psb_spmm(done,a,w1,dzero,w,desc_a,info,work=aux)
!
call mgs(i,h,v,w,rs,c,s,desc_a,info)
do k = 1, i
h(k,i) = psb_gedot(v(k),w,desc_a,info)
call psb_geaxpby(-h(k,i),v(k),done,w,desc_a,info)
end do
h(i+1,i) = psb_genrm2(w,desc_a,info)
scal=done/h(i+1,i)
call psb_geaxpby(scal,w,dzero,v(i+1),desc_a,info)
do k=2,i
call drot(1,h(k-1,i),1,h(k,i),1,real(c(k-1),kind=psb_dpk_),s(k-1))
enddo
rti = h(i,i)
rti1 = h(i+1,i)
call drotg(rti,rti1,tmp,s(i))
c(i) = cmplx(tmp,dzero)
call drot(1,h(i,i),1,h(i+1,i),1,real(c(i),kind=psb_dpk_),s(i))
h(i+1,i) = dzero
call drot(1,rs(i),1,rs(i+1),1,real(c(i),kind=psb_dpk_),s(i))
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
!
! build x and then compute the residual and its infinity norm
!
rst = rs
call w1%set(dzero)
call dtrsm('l','u','n','n',i,1,done,h,size(h,1),rst,size(rst,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rst(1:i)
do k=1, i
call psb_geaxpby(rst(k),v(k),done,xt,desc_a,info)
end do
call prec%apply(xt,desc_a,info)
call psb_geaxpby(done,x,done,xt,desc_a,info)
call psb_geaxpby(done,x,dzero,xt,desc_a,info)
call rebuildx(i,h,v,w,w1,xt,rst,c,s,prec,desc_a,info)
call psb_geaxpby(done,b,dzero,w1,desc_a,info)
call psb_spmm(-done,a,xt,done,w1,desc_a,info,work=aux)
rni = psb_geamax(w1,desc_a,info)
@@ -403,8 +400,7 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
errnum = rni
errden = (ani*xni+bni)
!
else if (istop_ == 2) then
case(psb_istop_bn2_)
!
! compute the residual 2-norm as byproduct of the solution
! procedure of the least-squares problem
@@ -412,7 +408,14 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
rni = abs(rs(i+1))
errnum = rni
errden = bn2
else if (istop_ == 3) then
case(psb_istop_rn2_abs_)
rni = abs(rs(i+1))
errnum = rni
errden = done
case(psb_istop_rrn2_)
!
! compute the residual 2-norm as byproduct of the solution
! procedure of the least-squares problem
@@ -420,28 +423,18 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
rni = abs(rs(i+1))
errnum = rni
errden = r0n2
endif
end select
if (errnum <= eps*errden) then
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
call psb_geaxpby(done,xt,dzero,x,desc_a,info)
! = x = xt
else if (istop_ == 2) then
!
! build x
!
call dtrsm('l','u','n','n',i,1,done,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:i)
call w1%set(dzero)
do k=1, i
call psb_geaxpby(rs(k),v(k),done,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(done,w,done,x,desc_a,info)
end if
case(psb_istop_bn2_, psb_istop_rn2_abs_,psb_istop_rrn2_)
call rebuildx(i,h,v,w,w1,x,rs,c,s,prec,desc_a,info) !
end select
if (itrace_ > 0) &
& call log_conv(methdname,me,itx,ione,errnum,errden,deps)
@@ -454,25 +447,15 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
end do inner
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
call psb_geaxpby(done,xt,dzero,x,desc_a,info)! x = xt
else if (istop_ == 2) then
!
! build x
!
call dtrsm('l','u','n','n',nl,1,done,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:nl)
call w1%set(dzero)
do k=1, nl
call psb_geaxpby(rs(k),v(k),done,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(done,w,done,x,desc_a,info)
end if
case(psb_istop_bn2_, psb_istop_rn2_abs_,psb_istop_rrn2_)
call rebuildx(nl,h,v,w,w1,x,rs,c,s,prec,desc_a,info) !
end select
if (itx >= litmax) then
if (itx >= itmax_) then
if (itrace_ > 0) then
if (mod(itx,itrace_)/=0) &
& call log_conv(methdname,me,itx,ione,errnum,errden,deps)
@@ -502,6 +485,67 @@ subroutine psb_drgmres_vect(a,prec,b,x,eps,desc_a,info,&
9999 call psb_error_handler(err_act)
return
contains
!
! Advance one step the Gram-Schmidt process, and apply
! Givens rotations to keep H triangular
!
subroutine mgs(n,h,v,w,rs,c,s,desc_a,info)
real(psb_dpk_) :: c(:), s(:), h(:,:), rs(:)
type(psb_d_vect_type) :: v(:), w
type(psb_desc_type) :: desc_a
real(psb_dpk_) :: scal, gm, rti, rti1
real(psb_dpk_) :: tmp
integer(psb_ipk_) :: info
integer(psb_ipk_) :: k,n
!
do k = 1, n
h(k,n) = psb_gedot(v(k),w,desc_a,info)
call psb_geaxpby(-h(k,n),v(k),done,w,desc_a,info)
end do
h(n+1,n) = psb_genrm2(w,desc_a,info)
scal=done/h(n+1,n)
call psb_geaxpby(scal,w,dzero,v(n+1),desc_a,info)
do k=2,n
call drot(1,h(k-1:k-1,n),1,h(k:k,n),1,real(c(k-1),kind=psb_dpk_),s(k-1))
enddo
rti = h(n,n)
rti1 = h(n+1,n)
call drotg(rti,rti1,tmp,s(n))
c(n) = cmplx(tmp,dzero)
call drot(1,h(n:n,n),1,h(n+1:n+1,n),1,real(c(n),kind=psb_dpk_),s(n))
call drot(1,rs(n:n),1,rs(n+1:n+1),1,real(c(n),kind=psb_dpk_),s(n))
end subroutine mgs
!
! Rebuild solution X from the space V using the factor
! stored in R
!
subroutine rebuildx(n,h,v,w,w1,x,rs,c,s,prec,desc_a,info)
real(psb_dpk_) :: c(:), s(:), rs(:), h(:,:)
type(psb_d_vect_type) :: v(:), w, w1, x
type(psb_desc_type) :: desc_a
class(psb_dprec_type) :: prec
integer(psb_ipk_) :: info
integer(psb_ipk_) :: k,n
!
!
! build x
!
call dtrsm('l','u','n','n',n,1,done,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:n)
call w1%zero()
do k=1, n
call psb_geaxpby(rs(k),v(k),done,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(done,w,done,x,desc_a,info)
end subroutine rebuildx
end subroutine psb_drgmres_vect
linsolve/impl/psb_sbicg.f90
+18 -8
View File
@@ -160,19 +160,29 @@ subroutine psb_sbicg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! istop_ = 1: normwise backward error, infinity norm
! istop_ = 2: ||r||/||b|| norm 2
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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_) then
linsolve/impl/psb_scg.F90
+22 -1
View File
@@ -159,8 +159,29 @@ subroutine psb_scg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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_)&
linsolve/impl/psb_scgs.f90
+22 -1
View File
@@ -154,8 +154,29 @@ Subroutine psb_scgs_vect(a,prec,b,x,eps,desc_a,info,&
If (Present(istop)) Then
istop_ = istop
Else
istop_ = 2
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)
linsolve/impl/psb_scgstab.f90
+23 -5
View File
@@ -156,13 +156,31 @@ Subroutine psb_scgstab_vect(a,prec,b,x,eps,desc_a,info,itmax,iter,err,itrace,ist
If (Present(istop)) Then
istop_ = istop
Else
istop_ = 2
Endif
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
! 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
! = if (.not.same_type_as(x,b)) then
! = write(0,*) 'Warning: different dynamic types for X and B '
! = end if
linsolve/impl/psb_scgstabl.f90
+22 -1
View File
@@ -172,8 +172,29 @@ Subroutine psb_scgstabl_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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
if (present(itmax)) then
itmax_ = itmax
linsolve/impl/psb_sfcg.F90
+22 -2
View File
@@ -164,9 +164,29 @@ subroutine psb_sfcg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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_)&
linsolve/impl/psb_sgcr.f90
+19 -11
View File
@@ -167,22 +167,30 @@ subroutine psb_sgcr_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! ISTOP_ = 1: Normwise backward error, infinity norm
! ISTOP_ = 2: ||r||/||b||, 2-norm
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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)
linsolve/impl/psb_srgmres.f90
+133 -89
View File
@@ -97,7 +97,8 @@
! iterations
! istop - integer(optional) Input: stopping criterion, or how
! to estimate the error.
! 1: err = |r|/(|a||x|+|b|); here the iteration is
! 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|
@@ -130,7 +131,7 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
type(psb_s_vect_type) :: w, w1, xt
real(psb_spk_) :: tmp
real(psb_spk_) :: scal, gm, rti, rti1
integer(psb_ipk_) ::litmax, naux, it, k, itrace_,&
integer(psb_ipk_) ::itmax_, naux, it, k, itrace_,&
& n_row, n_col, nl
integer(psb_lpk_) :: mglob
Logical, Parameter :: exchange=.True., noexchange=.False., use_srot=.true.
@@ -172,24 +173,35 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! ISTOP_ = 1: Normwise backward error, infinity norm
! ISTOP_ = 2: ||r||/||b||, 2-norm
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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
if (present(itmax)) then
litmax = itmax
itmax_ = itmax
else
litmax = 1000
itmax_ = 1000
endif
if (present(itrace)) then
@@ -253,12 +265,15 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
& w%get_nrows(),w1%get_nrows()
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
ani = psb_spnrmi(a,desc_a,info)
bni = psb_geamax(b,desc_a,info)
else if (istop_ == 2) then
bn2 = psb_genrm2(b,desc_a,info)
else if (istop_ == 3) then
case(psb_istop_bn2_)
bn2 = psb_genrm2(b,desc_a,info)
case(psb_istop_rn2_abs_)
! do nothing
case(psb_istop_rrn2_)
call psb_geaxpby(sone,b,szero,v(1),desc_a,info)
if (info /= psb_success_) then
info=psb_err_from_subroutine_non_
@@ -273,7 +288,8 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
goto 9999
end if
r0n2 = psb_genrm2(v(1),desc_a,info)
endif
end select
errnum = szero
errden = sone
deps = eps
@@ -324,27 +340,32 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
!
! check convergence
!
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
rni = psb_geamax(v(1),desc_a,info)
xni = psb_geamax(x,desc_a,info)
errnum = rni
errden = (ani*xni+bni)
else if (istop_ == 2) then
case(psb_istop_bn2_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = bn2
else if (istop_ == 3) then
case(psb_istop_rn2_abs_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = sone
case(psb_istop_rrn2_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = r0n2
endif
end select
if (info /= psb_success_) then
info=psb_err_from_subroutine_non_
call psb_errpush(info,name)
goto 9999
end if
if ((errnum <= eps*errden).or.(itx >= litmax)) exit restart
if ((errnum <= eps*errden).or.(itx >= itmax_)) exit restart
if (itrace_ > 0) &
& call log_conv(methdname,me,itx,itrace_,errnum,errden,deps)
@@ -360,42 +381,18 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
call prec%apply(v(i),w1,desc_a,info)
call psb_spmm(sone,a,w1,szero,w,desc_a,info,work=aux)
!
call mgs(i,h,v,w,rs,c,s,desc_a,info)
do k = 1, i
h(k,i) = psb_gedot(v(k),w,desc_a,info)
call psb_geaxpby(-h(k,i),v(k),sone,w,desc_a,info)
end do
h(i+1,i) = psb_genrm2(w,desc_a,info)
scal=sone/h(i+1,i)
call psb_geaxpby(scal,w,szero,v(i+1),desc_a,info)
do k=2,i
call srot(1,h(k-1,i),1,h(k,i),1,real(c(k-1),kind=psb_spk_),s(k-1))
enddo
rti = h(i,i)
rti1 = h(i+1,i)
call srotg(rti,rti1,tmp,s(i))
c(i) = cmplx(tmp,szero)
call srot(1,h(i,i),1,h(i+1,i),1,real(c(i),kind=psb_spk_),s(i))
h(i+1,i) = szero
call srot(1,rs(i),1,rs(i+1),1,real(c(i),kind=psb_spk_),s(i))
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
!
! build x and then compute the residual and its infinity norm
!
rst = rs
call w1%set(szero)
call strsm('l','u','n','n',i,1,sone,h,size(h,1),rst,size(rst,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rst(1:i)
do k=1, i
call psb_geaxpby(rst(k),v(k),sone,xt,desc_a,info)
end do
call prec%apply(xt,desc_a,info)
call psb_geaxpby(sone,x,sone,xt,desc_a,info)
call psb_geaxpby(sone,x,szero,xt,desc_a,info)
call rebuildx(i,h,v,w,w1,xt,rst,c,s,prec,desc_a,info)
call psb_geaxpby(sone,b,szero,w1,desc_a,info)
call psb_spmm(-sone,a,xt,sone,w1,desc_a,info,work=aux)
rni = psb_geamax(w1,desc_a,info)
@@ -403,8 +400,7 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
errnum = rni
errden = (ani*xni+bni)
!
else if (istop_ == 2) then
case(psb_istop_bn2_)
!
! compute the residual 2-norm as byproduct of the solution
! procedure of the least-squares problem
@@ -412,7 +408,14 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
rni = abs(rs(i+1))
errnum = rni
errden = bn2
else if (istop_ == 3) then
case(psb_istop_rn2_abs_)
rni = abs(rs(i+1))
errnum = rni
errden = sone
case(psb_istop_rrn2_)
!
! compute the residual 2-norm as byproduct of the solution
! procedure of the least-squares problem
@@ -420,28 +423,18 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
rni = abs(rs(i+1))
errnum = rni
errden = r0n2
endif
end select
if (errnum <= eps*errden) then
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
call psb_geaxpby(sone,xt,szero,x,desc_a,info)
! = x = xt
else if (istop_ == 2) then
!
! build x
!
call strsm('l','u','n','n',i,1,sone,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:i)
call w1%set(szero)
do k=1, i
call psb_geaxpby(rs(k),v(k),sone,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(sone,w,sone,x,desc_a,info)
end if
case(psb_istop_bn2_, psb_istop_rn2_abs_,psb_istop_rrn2_)
call rebuildx(i,h,v,w,w1,x,rs,c,s,prec,desc_a,info) !
end select
if (itrace_ > 0) &
& call log_conv(methdname,me,itx,ione,errnum,errden,deps)
@@ -454,25 +447,15 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
end do inner
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
call psb_geaxpby(sone,xt,szero,x,desc_a,info)! x = xt
else if (istop_ == 2) then
!
! build x
!
call strsm('l','u','n','n',nl,1,sone,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:nl)
call w1%set(szero)
do k=1, nl
call psb_geaxpby(rs(k),v(k),sone,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(sone,w,sone,x,desc_a,info)
end if
case(psb_istop_bn2_, psb_istop_rn2_abs_,psb_istop_rrn2_)
call rebuildx(nl,h,v,w,w1,x,rs,c,s,prec,desc_a,info) !
end select
if (itx >= litmax) then
if (itx >= itmax_) then
if (itrace_ > 0) then
if (mod(itx,itrace_)/=0) &
& call log_conv(methdname,me,itx,ione,errnum,errden,deps)
@@ -502,6 +485,67 @@ subroutine psb_srgmres_vect(a,prec,b,x,eps,desc_a,info,&
9999 call psb_error_handler(err_act)
return
contains
!
! Advance one step the Gram-Schmidt process, and apply
! Givens rotations to keep H triangular
!
subroutine mgs(n,h,v,w,rs,c,s,desc_a,info)
real(psb_spk_) :: c(:), s(:), h(:,:), rs(:)
type(psb_s_vect_type) :: v(:), w
type(psb_desc_type) :: desc_a
real(psb_spk_) :: scal, gm, rti, rti1
real(psb_spk_) :: tmp
integer(psb_ipk_) :: info
integer(psb_ipk_) :: k,n
!
do k = 1, n
h(k,n) = psb_gedot(v(k),w,desc_a,info)
call psb_geaxpby(-h(k,n),v(k),sone,w,desc_a,info)
end do
h(n+1,n) = psb_genrm2(w,desc_a,info)
scal=sone/h(n+1,n)
call psb_geaxpby(scal,w,szero,v(n+1),desc_a,info)
do k=2,n
call srot(1,h(k-1:k-1,n),1,h(k:k,n),1,real(c(k-1),kind=psb_spk_),s(k-1))
enddo
rti = h(n,n)
rti1 = h(n+1,n)
call srotg(rti,rti1,tmp,s(n))
c(n) = cmplx(tmp,szero)
call srot(1,h(n:n,n),1,h(n+1:n+1,n),1,real(c(n),kind=psb_spk_),s(n))
call srot(1,rs(n:n),1,rs(n+1:n+1),1,real(c(n),kind=psb_spk_),s(n))
end subroutine mgs
!
! Rebuild solution X from the space V using the factor
! stored in R
!
subroutine rebuildx(n,h,v,w,w1,x,rs,c,s,prec,desc_a,info)
real(psb_spk_) :: c(:), s(:), rs(:), h(:,:)
type(psb_s_vect_type) :: v(:), w, w1, x
type(psb_desc_type) :: desc_a
class(psb_sprec_type) :: prec
integer(psb_ipk_) :: info
integer(psb_ipk_) :: k,n
!
!
! build x
!
call strsm('l','u','n','n',n,1,sone,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:n)
call w1%zero()
do k=1, n
call psb_geaxpby(rs(k),v(k),sone,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(sone,w,sone,x,desc_a,info)
end subroutine rebuildx
end subroutine psb_srgmres_vect
linsolve/impl/psb_zbicg.f90
+18 -8
View File
@@ -160,19 +160,29 @@ subroutine psb_zbicg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! istop_ = 1: normwise backward error, infinity norm
! istop_ = 2: ||r||/||b|| norm 2
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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_) then
linsolve/impl/psb_zcg.F90
+22 -1
View File
@@ -159,8 +159,29 @@ subroutine psb_zcg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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_)&
linsolve/impl/psb_zcgs.f90
+22 -1
View File
@@ -154,8 +154,29 @@ Subroutine psb_zcgs_vect(a,prec,b,x,eps,desc_a,info,&
If (Present(istop)) Then
istop_ = istop
Else
istop_ = 2
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)
linsolve/impl/psb_zcgstab.f90
+23 -5
View File
@@ -156,13 +156,31 @@ Subroutine psb_zcgstab_vect(a,prec,b,x,eps,desc_a,info,itmax,iter,err,itrace,ist
If (Present(istop)) Then
istop_ = istop
Else
istop_ = 2
Endif
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
! 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
! = if (.not.same_type_as(x,b)) then
! = write(0,*) 'Warning: different dynamic types for X and B '
! = end if
linsolve/impl/psb_zcgstabl.f90
+22 -1
View File
@@ -172,8 +172,29 @@ Subroutine psb_zcgstabl_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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
if (present(itmax)) then
itmax_ = itmax
linsolve/impl/psb_zfcg.F90
+22 -2
View File
@@ -164,9 +164,29 @@ subroutine psb_zfcg_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
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_)&
linsolve/impl/psb_zgcr.f90
+19 -11
View File
@@ -167,22 +167,30 @@ subroutine psb_zgcr_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! ISTOP_ = 1: Normwise backward error, infinity norm
! ISTOP_ = 2: ||r||/||b||, 2-norm
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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)
linsolve/impl/psb_zrgmres.f90
+133 -89
View File
@@ -97,7 +97,8 @@
! iterations
! istop - integer(optional) Input: stopping criterion, or how
! to estimate the error.
! 1: err = |r|/(|a||x|+|b|); here the iteration is
! 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|
@@ -130,7 +131,7 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
type(psb_z_vect_type) :: w, w1, xt
real(psb_dpk_) :: tmp
complex(psb_dpk_) :: scal, gm, rti, rti1
integer(psb_ipk_) ::litmax, naux, it, k, itrace_,&
integer(psb_ipk_) ::itmax_, naux, it, k, itrace_,&
& n_row, n_col, nl
integer(psb_lpk_) :: mglob
Logical, Parameter :: exchange=.True., noexchange=.False., use_srot=.true.
@@ -172,24 +173,35 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
if (present(istop)) then
istop_ = istop
else
istop_ = 2
istop_ = psb_get_istop_default()
endif
!
! ISTOP_ = 1: Normwise backward error, infinity norm
! ISTOP_ = 2: ||r||/||b||, 2-norm
!
if ((istop_ < 1 ).or.(istop_ > 2 ) ) then
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
endif
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
if (present(itmax)) then
litmax = itmax
itmax_ = itmax
else
litmax = 1000
itmax_ = 1000
endif
if (present(itrace)) then
@@ -253,12 +265,15 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
& w%get_nrows(),w1%get_nrows()
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
ani = psb_spnrmi(a,desc_a,info)
bni = psb_geamax(b,desc_a,info)
else if (istop_ == 2) then
bn2 = psb_genrm2(b,desc_a,info)
else if (istop_ == 3) then
case(psb_istop_bn2_)
bn2 = psb_genrm2(b,desc_a,info)
case(psb_istop_rn2_abs_)
! do nothing
case(psb_istop_rrn2_)
call psb_geaxpby(zone,b,zzero,v(1),desc_a,info)
if (info /= psb_success_) then
info=psb_err_from_subroutine_non_
@@ -273,7 +288,8 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
goto 9999
end if
r0n2 = psb_genrm2(v(1),desc_a,info)
endif
end select
errnum = zzero
errden = zone
deps = eps
@@ -324,27 +340,32 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
!
! check convergence
!
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
rni = psb_geamax(v(1),desc_a,info)
xni = psb_geamax(x,desc_a,info)
errnum = rni
errden = (ani*xni+bni)
else if (istop_ == 2) then
case(psb_istop_bn2_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = bn2
else if (istop_ == 3) then
case(psb_istop_rn2_abs_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = done
case(psb_istop_rrn2_)
rni = psb_genrm2(v(1),desc_a,info)
errnum = rni
errden = r0n2
endif
end select
if (info /= psb_success_) then
info=psb_err_from_subroutine_non_
call psb_errpush(info,name)
goto 9999
end if
if ((errnum <= eps*errden).or.(itx >= litmax)) exit restart
if ((errnum <= eps*errden).or.(itx >= itmax_)) exit restart
if (itrace_ > 0) &
& call log_conv(methdname,me,itx,itrace_,errnum,errden,deps)
@@ -360,42 +381,18 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
call prec%apply(v(i),w1,desc_a,info)
call psb_spmm(zone,a,w1,zzero,w,desc_a,info,work=aux)
!
call mgs(i,h,v,w,rs,c,s,desc_a,info)
do k = 1, i
h(k,i) = psb_gedot(v(k),w,desc_a,info)
call psb_geaxpby(-h(k,i),v(k),zone,w,desc_a,info)
end do
h(i+1,i) = psb_genrm2(w,desc_a,info)
scal=zone/h(i+1,i)
call psb_geaxpby(scal,w,zzero,v(i+1),desc_a,info)
do k=2,i
call zrot(1,h(k-1,i),1,h(k,i),1,real(c(k-1),kind=psb_dpk_),s(k-1))
enddo
rti = h(i,i)
rti1 = h(i+1,i)
call zrotg(rti,rti1,tmp,s(i))
c(i) = cmplx(tmp,dzero)
call zrot(1,h(i,i),1,h(i+1,i),1,real(c(i),kind=psb_dpk_),s(i))
h(i+1,i) = zzero
call zrot(1,rs(i),1,rs(i+1),1,real(c(i),kind=psb_dpk_),s(i))
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
!
! build x and then compute the residual and its infinity norm
!
rst = rs
call w1%set(zzero)
call ztrsm('l','u','n','n',i,1,zone,h,size(h,1),rst,size(rst,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rst(1:i)
do k=1, i
call psb_geaxpby(rst(k),v(k),zone,xt,desc_a,info)
end do
call prec%apply(xt,desc_a,info)
call psb_geaxpby(zone,x,zone,xt,desc_a,info)
call psb_geaxpby(zone,x,zzero,xt,desc_a,info)
call rebuildx(i,h,v,w,w1,xt,rst,c,s,prec,desc_a,info)
call psb_geaxpby(zone,b,zzero,w1,desc_a,info)
call psb_spmm(-zone,a,xt,zone,w1,desc_a,info,work=aux)
rni = psb_geamax(w1,desc_a,info)
@@ -403,8 +400,7 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
errnum = rni
errden = (ani*xni+bni)
!
else if (istop_ == 2) then
case(psb_istop_bn2_)
!
! compute the residual 2-norm as byproduct of the solution
! procedure of the least-squares problem
@@ -412,7 +408,14 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
rni = abs(rs(i+1))
errnum = rni
errden = bn2
else if (istop_ == 3) then
case(psb_istop_rn2_abs_)
rni = abs(rs(i+1))
errnum = rni
errden = done
case(psb_istop_rrn2_)
!
! compute the residual 2-norm as byproduct of the solution
! procedure of the least-squares problem
@@ -420,28 +423,18 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
rni = abs(rs(i+1))
errnum = rni
errden = r0n2
endif
end select
if (errnum <= eps*errden) then
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
call psb_geaxpby(zone,xt,zzero,x,desc_a,info)
! = x = xt
else if (istop_ == 2) then
!
! build x
!
call ztrsm('l','u','n','n',i,1,zone,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:i)
call w1%set(zzero)
do k=1, i
call psb_geaxpby(rs(k),v(k),zone,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(zone,w,zone,x,desc_a,info)
end if
case(psb_istop_bn2_, psb_istop_rn2_abs_,psb_istop_rrn2_)
call rebuildx(i,h,v,w,w1,x,rs,c,s,prec,desc_a,info) !
end select
if (itrace_ > 0) &
& call log_conv(methdname,me,itx,ione,errnum,errden,deps)
@@ -454,25 +447,15 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
end do inner
if (istop_ == 1) then
select case(istop_)
case(psb_istop_ani_)
call psb_geaxpby(zone,xt,zzero,x,desc_a,info)! x = xt
else if (istop_ == 2) then
!
! build x
!
call ztrsm('l','u','n','n',nl,1,zone,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:nl)
call w1%set(zzero)
do k=1, nl
call psb_geaxpby(rs(k),v(k),zone,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(zone,w,zone,x,desc_a,info)
end if
case(psb_istop_bn2_, psb_istop_rn2_abs_,psb_istop_rrn2_)
call rebuildx(nl,h,v,w,w1,x,rs,c,s,prec,desc_a,info) !
end select
if (itx >= litmax) then
if (itx >= itmax_) then
if (itrace_ > 0) then
if (mod(itx,itrace_)/=0) &
& call log_conv(methdname,me,itx,ione,errnum,errden,deps)
@@ -502,6 +485,67 @@ subroutine psb_zrgmres_vect(a,prec,b,x,eps,desc_a,info,&
9999 call psb_error_handler(err_act)
return
contains
!
! Advance one step the Gram-Schmidt process, and apply
! Givens rotations to keep H triangular
!
subroutine mgs(n,h,v,w,rs,c,s,desc_a,info)
complex(psb_dpk_) :: c(:), s(:), h(:,:), rs(:)
type(psb_z_vect_type) :: v(:), w
type(psb_desc_type) :: desc_a
complex(psb_dpk_) :: scal, gm, rti, rti1
real(psb_dpk_) :: tmp
integer(psb_ipk_) :: info
integer(psb_ipk_) :: k,n
!
do k = 1, n
h(k,n) = psb_gedot(v(k),w,desc_a,info)
call psb_geaxpby(-h(k,n),v(k),zone,w,desc_a,info)
end do
h(n+1,n) = psb_genrm2(w,desc_a,info)
scal=zone/h(n+1,n)
call psb_geaxpby(scal,w,zzero,v(n+1),desc_a,info)
do k=2,n
call zrot(1,h(k-1:k-1,n),1,h(k:k,n),1,real(c(k-1),kind=psb_dpk_),s(k-1))
enddo
rti = h(n,n)
rti1 = h(n+1,n)
call zrotg(rti,rti1,tmp,s(n))
c(n) = cmplx(tmp,dzero)
call zrot(1,h(n:n,n),1,h(n+1:n+1,n),1,real(c(n),kind=psb_dpk_),s(n))
call zrot(1,rs(n:n),1,rs(n+1:n+1),1,real(c(n),kind=psb_dpk_),s(n))
end subroutine mgs
!
! Rebuild solution X from the space V using the factor
! stored in R
!
subroutine rebuildx(n,h,v,w,w1,x,rs,c,s,prec,desc_a,info)
complex(psb_dpk_) :: c(:), s(:), rs(:), h(:,:)
type(psb_z_vect_type) :: v(:), w, w1, x
type(psb_desc_type) :: desc_a
class(psb_zprec_type) :: prec
integer(psb_ipk_) :: info
integer(psb_ipk_) :: k,n
!
!
! build x
!
call ztrsm('l','u','n','n',n,1,zone,h,size(h,1),rs,size(rs,1))
if (debug_level >= psb_debug_ext_) &
& write(debug_unit,*) me,' ',trim(name),&
& ' Rebuild x-> RS:',rs(1:n)
call w1%zero()
do k=1, n
call psb_geaxpby(rs(k),v(k),zone,w1,desc_a,info)
end do
call prec%apply(w1,w,desc_a,info)
call psb_geaxpby(zone,w,zone,x,desc_a,info)
end subroutine rebuildx
end subroutine psb_zrgmres_vect