From e391e1b00ba500aea4c704fb166ec2088c449cee Mon Sep 17 00:00:00 2001 From: Salvatore Filippone Date: Fri, 17 Feb 2012 22:07:56 +0000 Subject: [PATCH] psblas3: test/pargen/ppde2d.f90 test/pargen/spde2d.f90 Added 2D test cases. --- test/pargen/ppde2d.f90 | 372 +++++++++++++++++++++++++++++++++++++++++ test/pargen/spde2d.f90 | 372 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 744 insertions(+) create mode 100644 test/pargen/ppde2d.f90 create mode 100644 test/pargen/spde2d.f90 diff --git a/test/pargen/ppde2d.f90 b/test/pargen/ppde2d.f90 new file mode 100644 index 00000000..67767039 --- /dev/null +++ b/test/pargen/ppde2d.f90 @@ -0,0 +1,372 @@ +!!$ +!!$ Parallel Sparse BLAS version 2.3.1 +!!$ (C) Copyright 2006, 2007, 2008, 2009, 2010 +!!$ Salvatore Filippone University of Rome Tor Vergata +!!$ Alfredo Buttari CNRS-IRIT, Toulouse +!!$ +!!$ 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 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: ppde2d.f90 +! +! Program: ppde2d +! This sample program solves a linear system obtained by discretizing a +! PDE with Dirichlet BCs. +! +! +! The PDE is a general second order equation in 2d +! +! a1 dd(u) a2 dd(u) b1 d(u) b2 d(u) +! - ------ - ------ ----- + ------ + c u = f +! dxdx dydy dx dy +! +! with Dirichlet boundary conditions +! u = g +! +! on the unit square 0<=x,y<=1. +! +! +! Note that if b1=b2=c=0., the PDE is the Laplace equation. +! +! In this sample program the index space of the discretized +! computational domain is first numbered sequentially in a standard way, +! then the corresponding vector is distributed according to a BLOCK +! data distribution. +! +program ppde2d + use psb_base_mod + use psb_prec_mod + use psb_krylov_mod + use psb_util_mod + implicit none + + ! input parameters + character(len=20) :: kmethd, ptype + character(len=5) :: afmt + integer(psb_ipk_) :: idim + + ! miscellaneous + real(psb_dpk_), parameter :: one = 1.d0 + real(psb_dpk_) :: t1, t2, tprec + + ! sparse matrix and preconditioner + type(psb_dspmat_type) :: a + type(psb_dprec_type) :: prec + ! descriptor + type(psb_desc_type) :: desc_a + ! dense vectors + type(psb_d_vect_type) :: xxv,bv + ! parallel environment + integer(psb_ipk_) :: ictxt, iam, np + + ! solver parameters + integer(psb_ipk_) :: iter, itmax,itrace, istopc, irst + integer(psb_long_int_k_) :: amatsize, precsize, descsize, d2size + real(psb_dpk_) :: err, eps + + ! other variables + integer(psb_ipk_) :: info, i + character(len=20) :: name,ch_err + character(len=40) :: fname + + info=psb_success_ + + + call psb_init(ictxt) + call psb_info(ictxt,iam,np) + + if (iam < 0) then + ! This should not happen, but just in case + call psb_exit(ictxt) + stop + endif + if(psb_get_errstatus() /= 0) goto 9999 + name='pde2d90' + call psb_set_errverbosity(2) + ! + ! Hello world + ! + if (iam == psb_root_) then + write(*,*) 'Welcome to PSBLAS version: ',psb_version_string_ + write(*,*) 'This is the ',trim(name),' sample program' + end if + ! + ! get parameters + ! + call get_parms(ictxt,kmethd,ptype,afmt,idim,istopc,itmax,itrace,irst) + + ! + ! allocate and fill in the coefficient matrix, rhs and initial guess + ! + call psb_barrier(ictxt) + t1 = psb_wtime() + call psb_gen_pde2d(ictxt,idim,a,bv,xxv,desc_a,afmt,a1,a2,b1,b2,c,g,info) + call psb_barrier(ictxt) + t2 = psb_wtime() - t1 + if(info /= psb_success_) then + info=psb_err_from_subroutine_ + ch_err='psb_gen_pde2d' + call psb_errpush(info,name,a_err=ch_err) + goto 9999 + end if + if (iam == psb_root_) write(psb_out_unit,'("Overall matrix creation time : ",es12.5)')t2 + if (iam == psb_root_) write(psb_out_unit,'(" ")') + ! + ! prepare the preconditioner. + ! + if(iam == psb_root_) write(psb_out_unit,'("Setting preconditioner to : ",a)')ptype + call psb_precinit(prec,ptype,info) + + call psb_barrier(ictxt) + t1 = psb_wtime() + call psb_precbld(a,desc_a,prec,info) + if(info /= psb_success_) then + info=psb_err_from_subroutine_ + ch_err='psb_precbld' + call psb_errpush(info,name,a_err=ch_err) + goto 9999 + end if + + tprec = psb_wtime()-t1 + + call psb_amx(ictxt,tprec) + + if (iam == psb_root_) write(psb_out_unit,'("Preconditioner time : ",es12.5)')tprec + if (iam == psb_root_) write(psb_out_unit,'(" ")') + ! + ! iterative method parameters + ! + if(iam == psb_root_) write(psb_out_unit,'("Calling iterative method ",a)')kmethd + call psb_barrier(ictxt) + t1 = psb_wtime() + eps = 1.d-9 + call psb_krylov(kmethd,a,prec,bv,xxv,eps,desc_a,info,& + & itmax=itmax,iter=iter,err=err,itrace=itrace,istop=istopc,irst=irst) + + if(info /= psb_success_) then + info=psb_err_from_subroutine_ + ch_err='solver routine' + call psb_errpush(info,name,a_err=ch_err) + goto 9999 + end if + + call psb_barrier(ictxt) + t2 = psb_wtime() - t1 + call psb_amx(ictxt,t2) + amatsize = a%sizeof() + descsize = desc_a%sizeof() + precsize = prec%sizeof() + call psb_sum(ictxt,amatsize) + call psb_sum(ictxt,descsize) + call psb_sum(ictxt,precsize) + + if (iam == psb_root_) then + write(psb_out_unit,'(" ")') + write(psb_out_unit,'("Time to solve matrix : ",es12.5)')t2 + write(psb_out_unit,'("Time per iteration : ",es12.5)')t2/iter + write(psb_out_unit,'("Number of iterations : ",i0)')iter + write(psb_out_unit,'("Convergence indicator on exit : ",es12.5)')err + write(psb_out_unit,'("Info on exit : ",i0)')info + write(psb_out_unit,'("Total memory occupation for A: ",i12)')amatsize + write(psb_out_unit,'("Total memory occupation for PREC: ",i12)')precsize + write(psb_out_unit,'("Total memory occupation for DESC_A: ",i12)')descsize + write(psb_out_unit,'("Storage type for DESC_A: ",a)') desc_a%indxmap%get_fmt() + end if + + + ! + ! cleanup storage and exit + ! + call psb_gefree(bv,desc_a,info) + call psb_gefree(xxv,desc_a,info) + call psb_spfree(a,desc_a,info) + call psb_precfree(prec,info) + call psb_cdfree(desc_a,info) + if(info /= psb_success_) then + info=psb_err_from_subroutine_ + ch_err='free routine' + call psb_errpush(info,name,a_err=ch_err) + goto 9999 + end if + +9999 continue + if(info /= psb_success_) then + call psb_error(ictxt) + end if + call psb_exit(ictxt) + stop + +contains + ! + ! get iteration parameters from standard input + ! + subroutine get_parms(ictxt,kmethd,ptype,afmt,idim,istopc,itmax,itrace,irst) + integer(psb_ipk_) :: ictxt + character(len=*) :: kmethd, ptype, afmt + integer(psb_ipk_) :: idim, istopc,itmax,itrace,irst + integer(psb_ipk_) :: np, iam + integer(psb_ipk_) :: intbuf(10), ip + + call psb_info(ictxt, iam, np) + + if (iam == 0) then + read(psb_inp_unit,*) ip + if (ip >= 3) then + read(psb_inp_unit,*) kmethd + read(psb_inp_unit,*) ptype + read(psb_inp_unit,*) afmt + + ! broadcast parameters to all processors + call psb_bcast(ictxt,kmethd) + call psb_bcast(ictxt,afmt) + call psb_bcast(ictxt,ptype) + + + read(psb_inp_unit,*) idim + if (ip >= 4) then + read(psb_inp_unit,*) istopc + else + istopc=1 + endif + if (ip >= 5) then + read(psb_inp_unit,*) itmax + else + itmax=500 + endif + if (ip >= 6) then + read(psb_inp_unit,*) itrace + else + itrace=-1 + endif + if (ip >= 7) then + read(psb_inp_unit,*) irst + else + irst=1 + endif + ! broadcast parameters to all processors + + intbuf(1) = idim + intbuf(2) = istopc + intbuf(3) = itmax + intbuf(4) = itrace + intbuf(5) = irst + call psb_bcast(ictxt,intbuf(1:5)) + + write(psb_out_unit,'("Solving matrix : ell1")') + write(psb_out_unit,'("Grid dimensions : ",i5," x ",i5)')idim,idim + write(psb_out_unit,'("Number of processors : ",i0)')np + write(psb_out_unit,'("Data distribution : BLOCK")') + write(psb_out_unit,'("Preconditioner : ",a)') ptype + write(psb_out_unit,'("Iterative method : ",a)') kmethd + write(psb_out_unit,'(" ")') + else + ! wrong number of parameter, print an error message and exit + call pr_usage(0) + call psb_abort(ictxt) + stop 1 + endif + else + call psb_bcast(ictxt,kmethd) + call psb_bcast(ictxt,afmt) + call psb_bcast(ictxt,ptype) + call psb_bcast(ictxt,intbuf(1:5)) + idim = intbuf(1) + istopc = intbuf(2) + itmax = intbuf(3) + itrace = intbuf(4) + irst = intbuf(5) + end if + return + + 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: pde2d90 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 + + ! + ! functions parametrizing the differential equation + ! + function b1(x,y) + use psb_base_mod, only : psb_dpk_ + real(psb_dpk_) :: b1 + real(psb_dpk_), intent(in) :: x,y + b1=1.d0/sqrt(2.d0) + end function b1 + function b2(x,y) + use psb_base_mod, only : psb_dpk_ + real(psb_dpk_) :: b2 + real(psb_dpk_), intent(in) :: x,y + b2=1.d0/sqrt(2.d0) + end function b2 + function c(x,y) + use psb_base_mod, only : psb_dpk_ + real(psb_dpk_) :: c + real(psb_dpk_), intent(in) :: x,y + c=0.d0 + end function c + function a1(x,y) + use psb_base_mod, only : psb_dpk_ + real(psb_dpk_) :: a1 + real(psb_dpk_), intent(in) :: x,y + a1=1.d0/80 + end function a1 + function a2(x,y) + use psb_base_mod, only : psb_dpk_ + real(psb_dpk_) :: a2 + real(psb_dpk_), intent(in) :: x,y + a2=1.d0/80 + end function a2 + function g(x,y) + use psb_base_mod, only : psb_dpk_, done + real(psb_dpk_) :: g + real(psb_dpk_), intent(in) :: x,y + g = dzero + if (x == done) then + g = done + else if (x == dzero) then + g = exp(-y**2) + end if + end function g + +end program ppde2d + + diff --git a/test/pargen/spde2d.f90 b/test/pargen/spde2d.f90 new file mode 100644 index 00000000..8a9cd0e9 --- /dev/null +++ b/test/pargen/spde2d.f90 @@ -0,0 +1,372 @@ +!!$ +!!$ Parallel Sparse BLAS version 2.3.1 +!!$ (C) Copyright 2006, 2007, 2008, 2009, 2010 +!!$ Salvatore Filippone University of Rome Tor Vergata +!!$ Alfredo Buttari CNRS-IRIT, Toulouse +!!$ +!!$ 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 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: spde2d.f90 +! +! Program: spde2d +! This sample program solves a linear system obtained by discretizing a +! PDE with Dirichlet BCs. +! +! +! The PDE is a general second order equation in 2d +! +! a1 dd(u) a2 dd(u) b1 d(u) b2 d(u) +! - ------ - ------ ----- + ------ + c u = f +! dxdx dydy dx dy +! +! with Dirichlet boundary conditions +! u = g +! +! on the unit square 0<=x,y<=1. +! +! +! Note that if b1=b2=c=0., the PDE is the Laplace equation. +! +! In this sample program the index space of the discretized +! computational domain is first numbered sequentially in a standard way, +! then the corresponding vector is distributed according to a BLOCK +! data distribution. +! +program spde2d + use psb_base_mod + use psb_prec_mod + use psb_krylov_mod + use psb_util_mod + implicit none + + ! input parameters + character(len=20) :: kmethd, ptype + character(len=5) :: afmt + integer(psb_ipk_) :: idim + + ! miscellaneous + real(psb_spk_), parameter :: one = 1.e0 + real(psb_dpk_) :: t1, t2, tprec + + ! sparse matrix and preconditioner + type(psb_sspmat_type) :: a + type(psb_sprec_type) :: prec + ! descriptor + type(psb_desc_type) :: desc_a + ! dense vectors + type(psb_s_vect_type) :: xxv,bv + ! parallel environment + integer(psb_ipk_) :: ictxt, iam, np + + ! solver parameters + integer(psb_ipk_) :: iter, itmax,itrace, istopc, irst + integer(psb_long_int_k_) :: amatsize, precsize, descsize, d2size + real(psb_spk_) :: err, eps + + ! other variables + integer(psb_ipk_) :: info, i + character(len=20) :: name,ch_err + character(len=40) :: fname + + info=psb_success_ + + + call psb_init(ictxt) + call psb_info(ictxt,iam,np) + + if (iam < 0) then + ! This should not happen, but just in case + call psb_exit(ictxt) + stop + endif + if(psb_get_errstatus() /= 0) goto 9999 + name='pde2d90' + call psb_set_errverbosity(2) + ! + ! Hello world + ! + if (iam == psb_root_) then + write(*,*) 'Welcome to PSBLAS version: ',psb_version_string_ + write(*,*) 'This is the ',trim(name),' sample program' + end if + ! + ! get parameters + ! + call get_parms(ictxt,kmethd,ptype,afmt,idim,istopc,itmax,itrace,irst) + + ! + ! allocate and fill in the coefficient matrix, rhs and initial guess + ! + call psb_barrier(ictxt) + t1 = psb_wtime() + call psb_gen_pde2d(ictxt,idim,a,bv,xxv,desc_a,afmt,a1,a2,b1,b2,c,g,info) + call psb_barrier(ictxt) + t2 = psb_wtime() - t1 + if(info /= psb_success_) then + info=psb_err_from_subroutine_ + ch_err='psb_gen_pde2d' + call psb_errpush(info,name,a_err=ch_err) + goto 9999 + end if + if (iam == psb_root_) write(psb_out_unit,'("Overall matrix creation time : ",es12.5)')t2 + if (iam == psb_root_) write(psb_out_unit,'(" ")') + ! + ! prepare the preconditioner. + ! + if(iam == psb_root_) write(psb_out_unit,'("Setting preconditioner to : ",a)')ptype + call psb_precinit(prec,ptype,info) + + call psb_barrier(ictxt) + t1 = psb_wtime() + call psb_precbld(a,desc_a,prec,info) + if(info /= psb_success_) then + info=psb_err_from_subroutine_ + ch_err='psb_precbld' + call psb_errpush(info,name,a_err=ch_err) + goto 9999 + end if + + tprec = psb_wtime()-t1 + + call psb_amx(ictxt,tprec) + + if (iam == psb_root_) write(psb_out_unit,'("Preconditioner time : ",es12.5)')tprec + if (iam == psb_root_) write(psb_out_unit,'(" ")') + ! + ! iterative method parameters + ! + if(iam == psb_root_) write(psb_out_unit,'("Calling iterative method ",a)')kmethd + call psb_barrier(ictxt) + t1 = psb_wtime() + eps = 1.d-9 + call psb_krylov(kmethd,a,prec,bv,xxv,eps,desc_a,info,& + & itmax=itmax,iter=iter,err=err,itrace=itrace,istop=istopc,irst=irst) + + if(info /= psb_success_) then + info=psb_err_from_subroutine_ + ch_err='solver routine' + call psb_errpush(info,name,a_err=ch_err) + goto 9999 + end if + + call psb_barrier(ictxt) + t2 = psb_wtime() - t1 + call psb_amx(ictxt,t2) + amatsize = a%sizeof() + descsize = desc_a%sizeof() + precsize = prec%sizeof() + call psb_sum(ictxt,amatsize) + call psb_sum(ictxt,descsize) + call psb_sum(ictxt,precsize) + + if (iam == psb_root_) then + write(psb_out_unit,'(" ")') + write(psb_out_unit,'("Time to solve matrix : ",es12.5)')t2 + write(psb_out_unit,'("Time per iteration : ",es12.5)')t2/iter + write(psb_out_unit,'("Number of iterations : ",i0)')iter + write(psb_out_unit,'("Convergence indicator on exit : ",es12.5)')err + write(psb_out_unit,'("Info on exit : ",i0)')info + write(psb_out_unit,'("Total memory occupation for A: ",i12)')amatsize + write(psb_out_unit,'("Total memory occupation for PREC: ",i12)')precsize + write(psb_out_unit,'("Total memory occupation for DESC_A: ",i12)')descsize + write(psb_out_unit,'("Storage type for DESC_A: ",a)') desc_a%indxmap%get_fmt() + end if + + + ! + ! cleanup storage and exit + ! + call psb_gefree(bv,desc_a,info) + call psb_gefree(xxv,desc_a,info) + call psb_spfree(a,desc_a,info) + call psb_precfree(prec,info) + call psb_cdfree(desc_a,info) + if(info /= psb_success_) then + info=psb_err_from_subroutine_ + ch_err='free routine' + call psb_errpush(info,name,a_err=ch_err) + goto 9999 + end if + +9999 continue + if(info /= psb_success_) then + call psb_error(ictxt) + end if + call psb_exit(ictxt) + stop + +contains + ! + ! get iteration parameters from standard input + ! + subroutine get_parms(ictxt,kmethd,ptype,afmt,idim,istopc,itmax,itrace,irst) + integer(psb_ipk_) :: ictxt + character(len=*) :: kmethd, ptype, afmt + integer(psb_ipk_) :: idim, istopc,itmax,itrace,irst + integer(psb_ipk_) :: np, iam + integer(psb_ipk_) :: intbuf(10), ip + + call psb_info(ictxt, iam, np) + + if (iam == 0) then + read(psb_inp_unit,*) ip + if (ip >= 3) then + read(psb_inp_unit,*) kmethd + read(psb_inp_unit,*) ptype + read(psb_inp_unit,*) afmt + + ! broadcast parameters to all processors + call psb_bcast(ictxt,kmethd) + call psb_bcast(ictxt,afmt) + call psb_bcast(ictxt,ptype) + + + read(psb_inp_unit,*) idim + if (ip >= 4) then + read(psb_inp_unit,*) istopc + else + istopc=1 + endif + if (ip >= 5) then + read(psb_inp_unit,*) itmax + else + itmax=500 + endif + if (ip >= 6) then + read(psb_inp_unit,*) itrace + else + itrace=-1 + endif + if (ip >= 7) then + read(psb_inp_unit,*) irst + else + irst=1 + endif + ! broadcast parameters to all processors + + intbuf(1) = idim + intbuf(2) = istopc + intbuf(3) = itmax + intbuf(4) = itrace + intbuf(5) = irst + call psb_bcast(ictxt,intbuf(1:5)) + + write(psb_out_unit,'("Solving matrix : ell1")') + write(psb_out_unit,'("Grid dimensions : ",i5," x ",i5)')idim,idim + write(psb_out_unit,'("Number of processors : ",i0)')np + write(psb_out_unit,'("Data distribution : BLOCK")') + write(psb_out_unit,'("Preconditioner : ",a)') ptype + write(psb_out_unit,'("Iterative method : ",a)') kmethd + write(psb_out_unit,'(" ")') + else + ! wrong number of parameter, print an error message and exit + call pr_usage(0) + call psb_abort(ictxt) + stop 1 + endif + else + call psb_bcast(ictxt,kmethd) + call psb_bcast(ictxt,afmt) + call psb_bcast(ictxt,ptype) + call psb_bcast(ictxt,intbuf(1:5)) + idim = intbuf(1) + istopc = intbuf(2) + itmax = intbuf(3) + itrace = intbuf(4) + irst = intbuf(5) + end if + return + + 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: pde2d90 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 + + ! + ! functions parametrizing the differential equation + ! + function b1(x,y) + use psb_base_mod, only : psb_spk_ + real(psb_spk_) :: b1 + real(psb_spk_), intent(in) :: x,y + b1=1.e0/sqrt(2.e0) + end function b1 + function b2(x,y) + use psb_base_mod, only : psb_spk_ + real(psb_spk_) :: b2 + real(psb_spk_), intent(in) :: x,y + b2=1.e0/sqrt(2.e0) + end function b2 + function c(x,y) + use psb_base_mod, only : psb_spk_ + real(psb_spk_) :: c + real(psb_spk_), intent(in) :: x,y + c=0.e0 + end function c + function a1(x,y) + use psb_base_mod, only : psb_spk_ + real(psb_spk_) :: a1 + real(psb_spk_), intent(in) :: x,y + a1=1.e0/80 + end function a1 + function a2(x,y) + use psb_base_mod, only : psb_spk_ + real(psb_spk_) :: a2 + real(psb_spk_), intent(in) :: x,y + a2=1.e0/80 + end function a2 + function g(x,y) + use psb_base_mod, only : psb_spk_, sone + real(psb_spk_) :: g + real(psb_spk_), intent(in) :: x,y + g = szero + if (x == sone) then + g = sone + else if (x == szero) then + g = exp(-y**2) + end if + end function g + +end program spde2d + +