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Updated README. Fixed some details of examples.

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stopcriterion
Salvatore Filippone 8 years ago
parent 0f98c53c74
commit 062f48d3c4
18 changed files with 76 additions and 221 deletions
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17
README
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@ -1,7 +1,22 @@
This directory contains the MLD2P4 set of preconditioners, version 2.0
This directory contains the MLD2P4 set of preconditioners, version 2.1
WHAT'S NEW
Version 2.1
1. The multigrid preconditioner now include fully general V- and W-
cycles. We also support K-cycles, intended to be used in
conjunction with Flexible CG available in PSBLAS 3.5.
2. The smoothers now include popular
variants such as Jacobi, forward and backward hybrid
Gauss-Seidel (intra-process Gauss-Seidel, inter-process
block-Jacobi).
3. The PRE and POST specification for smoothers can now be
specified independently of each other: you can even specify
different smoothers for PRE and POST (e.g. forward Gauss-Seidel
PRE with backward Gauss-Seidel POST). The default is to
have the specs apply to both PRE and POST.
Version 2.0.
Finally moved to F2003, with the support of PSBLAS3.

5
examples/fileread/mld_cexample_1lev.f90
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@ -89,7 +89,6 @@ program mld_cexample_1lev
real(psb_dpk_) :: t1, t2, tprec
character(len=20) :: name
integer, parameter :: iunit=12
type(psb_c_vect_type) :: x_col, r_col
! initialize the parallel environment
@ -263,9 +262,9 @@ program mld_cexample_1lev
write(*,'("Total memory occupation for PREC : ",i12)')precsize
end if
call psb_gather(x_glob,x_col,desc_a,info,root=psb_root_)
call psb_gather(x_glob,x,desc_a,info,root=psb_root_)
if (info == psb_success_) &
& call psb_gather(r_glob,r_col,desc_a,info,root=psb_root_)
& call psb_gather(r_glob,r,desc_a,info,root=psb_root_)
if (info /= psb_success_) goto 9999
if (iam == psb_root_) then
write(0,'(" ")')

5
examples/fileread/mld_dexample_1lev.f90
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@ -89,7 +89,6 @@ program mld_dexample_1lev
real(psb_dpk_) :: t1, t2, tprec
character(len=20) :: name
integer, parameter :: iunit=12
type(psb_d_vect_type) :: x_col, r_col
! initialize the parallel environment
@ -263,9 +262,9 @@ program mld_dexample_1lev
write(*,'("Total memory occupation for PREC : ",i12)')precsize
end if
call psb_gather(x_glob,x_col,desc_a,info,root=psb_root_)
call psb_gather(x_glob,x,desc_a,info,root=psb_root_)
if (info == psb_success_) &
& call psb_gather(r_glob,r_col,desc_a,info,root=psb_root_)
& call psb_gather(r_glob,r,desc_a,info,root=psb_root_)
if (info /= psb_success_) goto 9999
if (iam == psb_root_) then
write(0,'(" ")')

5
examples/fileread/mld_sexample_1lev.f90
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@ -89,7 +89,6 @@ program mld_sexample_1lev
real(psb_dpk_) :: t1, t2, tprec
character(len=20) :: name
integer, parameter :: iunit=12
type(psb_s_vect_type) :: x_col, r_col
! initialize the parallel environment
@ -263,9 +262,9 @@ program mld_sexample_1lev
write(*,'("Total memory occupation for PREC : ",i12)')precsize
end if
call psb_gather(x_glob,x_col,desc_a,info,root=psb_root_)
call psb_gather(x_glob,x,desc_a,info,root=psb_root_)
if (info == psb_success_) &
& call psb_gather(r_glob,r_col,desc_a,info,root=psb_root_)
& call psb_gather(r_glob,r,desc_a,info,root=psb_root_)
if (info /= psb_success_) goto 9999
if (iam == psb_root_) then
write(0,'(" ")')

5
examples/fileread/mld_zexample_1lev.f90
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@ -89,7 +89,6 @@ program mld_zexample_1lev
real(psb_dpk_) :: t1, t2, tprec
character(len=20) :: name
integer, parameter :: iunit=12
type(psb_z_vect_type) :: x_col, r_col
! initialize the parallel environment
@ -263,9 +262,9 @@ program mld_zexample_1lev
write(*,'("Total memory occupation for PREC : ",i12)')precsize
end if
call psb_gather(x_glob,x_col,desc_a,info,root=psb_root_)
call psb_gather(x_glob,x,desc_a,info,root=psb_root_)
if (info == psb_success_) &
& call psb_gather(r_glob,r_col,desc_a,info,root=psb_root_)
& call psb_gather(r_glob,r,desc_a,info,root=psb_root_)
if (info /= psb_success_) goto 9999
if (iam == psb_root_) then
write(0,'(" ")')

14
examples/pdegen/mld_dexample_1lev.f90
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@ -68,43 +68,43 @@ contains
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: b1
real(psb_dpk_), intent(in) :: x,y,z
b1=done/sqrt(3.d0)
b1=dzero
end function b1
function b2(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: b2
real(psb_dpk_), intent(in) :: x,y,z
b2=done/sqrt(3.d0)
b2=dzero
end function b2
function b3(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: b3
real(psb_dpk_), intent(in) :: x,y,z
b3=done/sqrt(3.d0)
b3=dzero
end function b3
function c(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: c
real(psb_dpk_), intent(in) :: x,y,z
c=0.d0
c=dzero
end function c
function a1(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: a1
real(psb_dpk_), intent(in) :: x,y,z
a1=done/80
a1=done
end function a1
function a2(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: a2
real(psb_dpk_), intent(in) :: x,y,z
a2=done/80
a2=done
end function a2
function a3(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: a3
real(psb_dpk_), intent(in) :: x,y,z
a3=done/80
a3=done
end function a3
function g(x,y,z)
use psb_base_mod, only : psb_dpk_, done, dzero

14
examples/pdegen/mld_dexample_ml.f90
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@ -86,43 +86,43 @@ contains
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: b1
real(psb_dpk_), intent(in) :: x,y,z
b1=done/sqrt(3.d0)
b1=dzero
end function b1
function b2(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: b2
real(psb_dpk_), intent(in) :: x,y,z
b2=done/sqrt(3.d0)
b2=dzero
end function b2
function b3(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: b3
real(psb_dpk_), intent(in) :: x,y,z
b3=done/sqrt(3.d0)
b3=dzero
end function b3
function c(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: c
real(psb_dpk_), intent(in) :: x,y,z
c=0.d0
c=dzero
end function c
function a1(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: a1
real(psb_dpk_), intent(in) :: x,y,z
a1=done/80
a1=done
end function a1
function a2(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: a2
real(psb_dpk_), intent(in) :: x,y,z
a2=done/80
a2=done
end function a2
function a3(x,y,z)
use psb_base_mod, only : psb_dpk_, done
real(psb_dpk_) :: a3
real(psb_dpk_), intent(in) :: x,y,z
a3=done/80
a3=done
end function a3
function g(x,y,z)
use psb_base_mod, only : psb_dpk_, done, dzero

14
examples/pdegen/mld_sexample_1lev.f90
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@ -68,43 +68,43 @@ contains
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: b1
real(psb_spk_), intent(in) :: x,y,z
b1=sone/sqrt(3.d0)
b1=szero
end function b1
function b2(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: b2
real(psb_spk_), intent(in) :: x,y,z
b2=sone/sqrt(3.d0)
b2=szero
end function b2
function b3(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: b3
real(psb_spk_), intent(in) :: x,y,z
b3=sone/sqrt(3.d0)
b3=szero
end function b3
function c(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: c
real(psb_spk_), intent(in) :: x,y,z
c=0.d0
c=szero
end function c
function a1(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: a1
real(psb_spk_), intent(in) :: x,y,z
a1=sone/80
a1=sone
end function a1
function a2(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: a2
real(psb_spk_), intent(in) :: x,y,z
a2=sone/80
a2=sone
end function a2
function a3(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: a3
real(psb_spk_), intent(in) :: x,y,z
a3=sone/80
a3=sone
end function a3
function g(x,y,z)
use psb_base_mod, only : psb_spk_, sone, szero

14
examples/pdegen/mld_sexample_ml.f90
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@ -86,43 +86,43 @@ contains
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: b1
real(psb_spk_), intent(in) :: x,y,z
b1=sone/sqrt(3.d0)
b1=szero
end function b1
function b2(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: b2
real(psb_spk_), intent(in) :: x,y,z
b2=sone/sqrt(3.d0)
b2=szero
end function b2
function b3(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: b3
real(psb_spk_), intent(in) :: x,y,z
b3=sone/sqrt(3.d0)
b3=szero
end function b3
function c(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: c
real(psb_spk_), intent(in) :: x,y,z
c=0.d0
c=szero
end function c
function a1(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: a1
real(psb_spk_), intent(in) :: x,y,z
a1=sone/80
a1=sone
end function a1
function a2(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: a2
real(psb_spk_), intent(in) :: x,y,z
a2=sone/80
a2=sone
end function a2
function a3(x,y,z)
use psb_base_mod, only : psb_spk_, sone
real(psb_spk_) :: a3
real(psb_spk_), intent(in) :: x,y,z
a3=sone/80
a3=sone
end function a3
function g(x,y,z)
use psb_base_mod, only : psb_spk_, sone, szero

18
tests/fileread/mld_cf_sample.f90
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@ -754,22 +754,4 @@ contains
end subroutine get_parms
subroutine pr_usage(iout)
integer(psb_ipk_) iout
write(iout, *) ' number of parameters is incorrect!'
write(iout, *) ' use: hb_sample mtrx_file methd prec [ptype &
&itmax istopc itrace]'
write(iout, *) ' where:'
write(iout, *) ' mtrx_file is stored in hb format'
write(iout, *) ' methd may be: cgstab '
write(iout, *) ' itmax max iterations [500] '
write(iout, *) ' istopc stopping criterion [1] '
write(iout, *) ' itrace 0 (no tracing, default) or '
write(iout, *) ' >= 0 do tracing every itrace'
write(iout, *) ' iterations '
write(iout, *) ' prec may be: ilu diagsc none'
write(iout, *) ' ptype partition strategy default 0'
write(iout, *) ' 0: block partition '
end subroutine pr_usage
end program mld_cf_sample

18
tests/fileread/mld_df_sample.f90
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@ -754,22 +754,4 @@ contains
end subroutine get_parms
subroutine pr_usage(iout)
integer(psb_ipk_) iout
write(iout, *) ' number of parameters is incorrect!'
write(iout, *) ' use: hb_sample mtrx_file methd prec [ptype &
&itmax istopc itrace]'
write(iout, *) ' where:'
write(iout, *) ' mtrx_file is stored in hb format'
write(iout, *) ' methd may be: cgstab '
write(iout, *) ' itmax max iterations [500] '
write(iout, *) ' istopc stopping criterion [1] '
write(iout, *) ' itrace 0 (no tracing, default) or '
write(iout, *) ' >= 0 do tracing every itrace'
write(iout, *) ' iterations '
write(iout, *) ' prec may be: ilu diagsc none'
write(iout, *) ' ptype partition strategy default 0'
write(iout, *) ' 0: block partition '
end subroutine pr_usage
end program mld_df_sample

18
tests/fileread/mld_sf_sample.f90
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@ -754,22 +754,4 @@ contains
end subroutine get_parms
subroutine pr_usage(iout)
integer(psb_ipk_) iout
write(iout, *) ' number of parameters is incorrect!'
write(iout, *) ' use: hb_sample mtrx_file methd prec [ptype &
&itmax istopc itrace]'
write(iout, *) ' where:'
write(iout, *) ' mtrx_file is stored in hb format'
write(iout, *) ' methd may be: cgstab '
write(iout, *) ' itmax max iterations [500] '
write(iout, *) ' istopc stopping criterion [1] '
write(iout, *) ' itrace 0 (no tracing, default) or '
write(iout, *) ' >= 0 do tracing every itrace'
write(iout, *) ' iterations '
write(iout, *) ' prec may be: ilu diagsc none'
write(iout, *) ' ptype partition strategy default 0'
write(iout, *) ' 0: block partition '
end subroutine pr_usage
end program mld_sf_sample

18
tests/fileread/mld_zf_sample.f90
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@ -754,22 +754,4 @@ contains
end subroutine get_parms
subroutine pr_usage(iout)
integer(psb_ipk_) iout
write(iout, *) ' number of parameters is incorrect!'
write(iout, *) ' use: hb_sample mtrx_file methd prec [ptype &
&itmax istopc itrace]'
write(iout, *) ' where:'
write(iout, *) ' mtrx_file is stored in hb format'
write(iout, *) ' methd may be: cgstab '
write(iout, *) ' itmax max iterations [500] '
write(iout, *) ' istopc stopping criterion [1] '
write(iout, *) ' itrace 0 (no tracing, default) or '
write(iout, *) ' >= 0 do tracing every itrace'
write(iout, *) ' iterations '
write(iout, *) ' prec may be: ilu diagsc none'
write(iout, *) ' ptype partition strategy default 0'
write(iout, *) ' 0: block partition '
end subroutine pr_usage
end program mld_zf_sample

8
tests/fileread/runs/dfs.inp
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@ -1,10 +1,10 @@
A1M-hetero3D.mtx ! This matrix (and others) from: http://math.nist.gov/MatrixMarket/ or
B1M-hetero3D.mtx ! rhs | http://www.cise.ufl.edu/research/sparse/matrices/index.html
mld_mat.mtx ! This matrix (and others) from: http://math.nist.gov/MatrixMarket/ or
mld_rhs.mtx ! rhs | http://www.cise.ufl.edu/research/sparse/matrices/index.html
NONE ! Initial guess
NONE ! Reference solution
mld_sol.mtx ! Reference solution
MM ! File format: MatrixMarket or Harwell-Boeing
CSR ! Storage format: CSR COO JAD
2 ! IPART (partition method): 0 (block) 2 (graph, with Metis)
0 ! IPART (partition method): 0 (block) 2 (graph, with Metis)
FCG ! Iterative method: BiCGSTAB BiCG CGS RGMRES BiCGSTABL CG
2 ! ISTOPC
00500 ! ITMAX

29
tests/pdegen/mld_d_pde2d.f90
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@ -73,13 +73,13 @@ contains
use psb_base_mod, only : psb_dpk_,done,dzero
real(psb_dpk_) :: b1
real(psb_dpk_), intent(in) :: x,y
b1=dzero/sqrt((2*done))
b1=dzero
end function b1
function b2(x,y)
use psb_base_mod, only : psb_dpk_,done,dzero
real(psb_dpk_) :: b2
real(psb_dpk_), intent(in) :: x,y
b2=dzero/sqrt((2*done))
b2=dzero
end function b2
function c(x,y)
use psb_base_mod, only : psb_dpk_,done,dzero
@ -91,13 +91,13 @@ contains
use psb_base_mod, only : psb_dpk_,done,dzero
real(psb_dpk_) :: a1
real(psb_dpk_), intent(in) :: x,y
a1=done!/80
a1=done
end function a1
function a2(x,y)
use psb_base_mod, only : psb_dpk_,done,dzero
real(psb_dpk_) :: a2
real(psb_dpk_), intent(in) :: x,y
a2=done!/80
a2=done
end function a2
function g(x,y)
use psb_base_mod, only : psb_dpk_, done, dzero
@ -622,25 +622,4 @@ contains
end subroutine get_parms
!
! print an error message
!
subroutine pr_usage(iout)
integer(psb_ipk_) :: iout
write(iout,*)'incorrect parameter(s) found'
write(iout,*)' usage: mld_d_pde2d methd prec dim &
&[istop itmax itrace]'
write(iout,*)' where:'
write(iout,*)' methd: cgstab cgs rgmres bicgstabl'
write(iout,*)' prec : bjac diag none'
write(iout,*)' dim number of points along each axis'
write(iout,*)' the size of the resulting linear '
write(iout,*)' system is dim**3'
write(iout,*)' istop stopping criterion 1, 2 '
write(iout,*)' itmax maximum number of iterations [500] '
write(iout,*)' itrace <=0 (no tracing, default) or '
write(iout,*)' >= 1 do tracing every itrace'
write(iout,*)' iterations '
end subroutine pr_usage
end program mld_d_pde2d

33
tests/pdegen/mld_d_pde3d.f90
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@ -73,19 +73,19 @@ contains
use psb_base_mod, only : psb_dpk_,done,dzero
real(psb_dpk_) :: b1
real(psb_dpk_), intent(in) :: x,y,z
b1=dzero/sqrt((3*done))
b1=dzero
end function b1
function b2(x,y,z)
use psb_base_mod, only : psb_dpk_,done,dzero
real(psb_dpk_) :: b2
real(psb_dpk_), intent(in) :: x,y,z
b2=dzero/sqrt((3*done))
b2=dzero
end function b2
function b3(x,y,z)
use psb_base_mod, only : psb_dpk_,done,dzero
real(psb_dpk_) :: b3
real(psb_dpk_), intent(in) :: x,y,z
b3=dzero/sqrt((3*done))
b3=dzero
end function b3
function c(x,y,z)
use psb_base_mod, only : psb_dpk_,done,dzero
@ -97,19 +97,19 @@ contains
use psb_base_mod, only : psb_dpk_,done,dzero
real(psb_dpk_) :: a1
real(psb_dpk_), intent(in) :: x,y,z
a1=done!/80
a1=done
end function a1
function a2(x,y,z)
use psb_base_mod, only : psb_dpk_,done,dzero
real(psb_dpk_) :: a2
real(psb_dpk_), intent(in) :: x,y,z
a2=done!/80
a2=done
end function a2
function a3(x,y,z)
use psb_base_mod, only : psb_dpk_,done,dzero
real(psb_dpk_) :: a3
real(psb_dpk_), intent(in) :: x,y,z
a3=done!/80
a3=done
end function a3
function g(x,y,z)
use psb_base_mod, only : psb_dpk_,done,dzero
@ -635,25 +635,4 @@ contains
end subroutine get_parms
!
! print an error message
!
subroutine pr_usage(iout)
integer(psb_ipk_) :: iout
write(iout,*)'incorrect parameter(s) found'
write(iout,*)' usage: mld_d_pde3d methd prec dim &
&[istop itmax itrace]'
write(iout,*)' where:'
write(iout,*)' methd: cgstab cgs rgmres bicgstabl'
write(iout,*)' prec : bjac diag none'
write(iout,*)' dim number of points along each axis'
write(iout,*)' the size of the resulting linear '
write(iout,*)' system is dim**3'
write(iout,*)' istop stopping criterion 1, 2 '
write(iout,*)' itmax maximum number of iterations [500] '
write(iout,*)' itrace <=0 (no tracing, default) or '
write(iout,*)' >= 1 do tracing every itrace'
write(iout,*)' iterations '
end subroutine pr_usage
end program mld_d_pde3d

29
tests/pdegen/mld_s_pde2d.f90
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@ -73,13 +73,13 @@ contains
use psb_base_mod, only : psb_spk_,sone,szero
real(psb_spk_) :: b1
real(psb_spk_), intent(in) :: x,y
b1=szero/sqrt((2*sone))
b1=szero
end function b1
function b2(x,y)
use psb_base_mod, only : psb_spk_,sone,szero
real(psb_spk_) :: b2
real(psb_spk_), intent(in) :: x,y
b2=szero/sqrt((2*sone))
b2=szero
end function b2
function c(x,y)
use psb_base_mod, only : psb_spk_,sone,szero
@ -91,13 +91,13 @@ contains
use psb_base_mod, only : psb_spk_,sone,szero
real(psb_spk_) :: a1
real(psb_spk_), intent(in) :: x,y
a1=sone!/80
a1=sone
end function a1
function a2(x,y)
use psb_base_mod, only : psb_spk_,sone,szero
real(psb_spk_) :: a2
real(psb_spk_), intent(in) :: x,y
a2=sone!/80
a2=sone
end function a2
function g(x,y)
use psb_base_mod, only : psb_spk_, sone, szero
@ -622,25 +622,4 @@ contains
end subroutine get_parms
!
! print an error message
!
subroutine pr_usage(iout)
integer(psb_ipk_) :: iout
write(iout,*)'incorrect parameter(s) found'
write(iout,*)' usage: mld_s_pde2d methd prec dim &
&[istop itmax itrace]'
write(iout,*)' where:'
write(iout,*)' methd: cgstab cgs rgmres bicgstabl'
write(iout,*)' prec : bjac diag none'
write(iout,*)' dim number of points along each axis'
write(iout,*)' the size of the resulting linear '
write(iout,*)' system is dim**3'
write(iout,*)' istop stopping criterion 1, 2 '
write(iout,*)' itmax maximum number of iterations [500] '
write(iout,*)' itrace <=0 (no tracing, default) or '
write(iout,*)' >= 1 do tracing every itrace'
write(iout,*)' iterations '
end subroutine pr_usage
end program mld_s_pde2d

33
tests/pdegen/mld_s_pde3d.f90
Unescape Escape View File

@ -73,19 +73,19 @@ contains
use psb_base_mod, only : psb_spk_,sone,szero
real(psb_spk_) :: b1
real(psb_spk_), intent(in) :: x,y,z
b1=szero/sqrt((3*sone))
b1=szero
end function b1
function b2(x,y,z)
use psb_base_mod, only : psb_spk_,sone,szero
real(psb_spk_) :: b2
real(psb_spk_), intent(in) :: x,y,z
b2=szero/sqrt((3*sone))
b2=szero
end function b2
function b3(x,y,z)
use psb_base_mod, only : psb_spk_,sone,szero
real(psb_spk_) :: b3
real(psb_spk_), intent(in) :: x,y,z
b3=szero/sqrt((3*sone))
b3=szero
end function b3
function c(x,y,z)
use psb_base_mod, only : psb_spk_,sone,szero
@ -97,19 +97,19 @@ contains
use psb_base_mod, only : psb_spk_,sone,szero
real(psb_spk_) :: a1
real(psb_spk_), intent(in) :: x,y,z
a1=sone!/80
a1=sone
end function a1
function a2(x,y,z)
use psb_base_mod, only : psb_spk_,sone,szero
real(psb_spk_) :: a2
real(psb_spk_), intent(in) :: x,y,z
a2=sone!/80
a2=sone
end function a2
function a3(x,y,z)
use psb_base_mod, only : psb_spk_,sone,szero
real(psb_spk_) :: a3
real(psb_spk_), intent(in) :: x,y,z
a3=sone!/80
a3=sone
end function a3
function g(x,y,z)
use psb_base_mod, only : psb_spk_,sone,szero
@ -635,25 +635,4 @@ contains
end subroutine get_parms
!
! print an error message
!
subroutine pr_usage(iout)
integer(psb_ipk_) :: iout
write(iout,*)'incorrect parameter(s) found'
write(iout,*)' usage: mld_s_pde3d methd prec dim &
&[istop itmax itrace]'
write(iout,*)' where:'
write(iout,*)' methd: cgstab cgs rgmres bicgstabl'
write(iout,*)' prec : bjac diag none'
write(iout,*)' dim number of points along each axis'
write(iout,*)' the size of the resulting linear '
write(iout,*)' system is dim**3'
write(iout,*)' istop stopping criterion 1, 2 '
write(iout,*)' itmax maximum number of iterations [500] '
write(iout,*)' itrace <=0 (no tracing, default) or '
write(iout,*)' >= 1 do tracing every itrace'
write(iout,*)' iterations '
end subroutine pr_usage
end program mld_s_pde3d

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