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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi, by running mpiexec –n 2 ./ex12 –ksp_view, I got:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>[d3m956@olympus ksp]$ mpiexec -n 2 ./ex12 -ksp_view<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>0, 56<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>0, 56<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>KSP Object: 1 MPI processes<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> type: gmres<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> GMRES: restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> GMRES: happy breakdown tolerance 1e-30<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> maximum iterations=10000, initial guess is zero<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> tolerances: relative=1e-05, absolute=1e-50, divergence=10000<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> left preconditioning<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> using PRECONDITIONED norm type for convergence test<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>PC Object: 1 MPI processes<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> type: ourjacobi<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> linear system matrix = precond matrix:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>KSP Object: 1 MPI processes<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> type: gmres<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> GMRES: restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> GMRES: happy breakdown tolerance 1e-30<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> maximum iterations=10000, initial guess is zero<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> tolerances: relative=1e-05, absolute=1e-50, divergence=10000<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> left preconditioning<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> using PRECONDITIONED norm type for convergence test<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>PC Object: 1 MPI processes<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> type: ourjacobi<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> linear system matrix = precond matrix:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Matrix Object: 1 MPI processes<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> type: seqaij<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> rows=56, cols=56<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> total: nonzeros=250, allocated nonzeros=280<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> total number of mallocs used during MatSetValues calls =0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> not using I-node routines<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Norm of error 2.10144e-06 iterations 14<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Matrix Object: 1 MPI processes<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> type: seqaij<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> rows=56, cols=56<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> total: nonzeros=250, allocated nonzeros=280<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> total number of mallocs used during MatSetValues calls =0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> not using I-node routines<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Norm of error 2.10144e-06 iterations 14<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Shuangshuang<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> petsc-users-bounces@mcs.anl.gov [mailto:petsc-users-bounces@mcs.anl.gov] <b>On Behalf Of </b>Hong Zhang<br><b>Sent:</b> Tuesday, April 16, 2013 11:26 AM<br><b>To:</b> PETSc users list<br><b>Subject:</b> Re: [petsc-users] KSPsolver<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>What do you get by running<o:p></o:p></p><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>mpiexec -n 2 ./ex12 -ksp_view</span><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>I get</span><o:p></o:p></p></div><div><div><p class=MsoNormal>mpiexec -n 2 ./ex12 -ksp_view<o:p></o:p></p></div><div><p class=MsoNormal>KSP Object: 2 MPI processes<o:p></o:p></p></div><div><p class=MsoNormal> type: gmres<o:p></o:p></p></div><div><p class=MsoNormal> GMRES: restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement<o:p></o:p></p></div><div><p class=MsoNormal> GMRES: happy breakdown tolerance 1e-30<o:p></o:p></p></div><div><p class=MsoNormal> maximum iterations=10000, initial guess is zero<o:p></o:p></p></div><div><p class=MsoNormal> tolerances: relative=1e-05, absolute=1e-50, divergence=10000<o:p></o:p></p></div><div><p class=MsoNormal> left preconditioning<o:p></o:p></p></div><div><p class=MsoNormal> using PRECONDITIONED norm type for convergence test<o:p></o:p></p></div><div><p class=MsoNormal> GMRES: restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement<o:p></o:p></p></div><div><p class=MsoNormal> GMRES: happy breakdown tolerance 1e-30<o:p></o:p></p></div><div><p class=MsoNormal>PC Object: 2 MPI processes<o:p></o:p></p></div><div><p class=MsoNormal> type: ourjacobi<o:p></o:p></p></div><div><p class=MsoNormal> linear system matrix = precond matrix:<o:p></o:p></p></div><div><p class=MsoNormal> Matrix Object: 2 MPI processes<o:p></o:p></p></div><div><p class=MsoNormal> type: mpiaij<o:p></o:p></p></div><div><p class=MsoNormal> rows=56, cols=56<o:p></o:p></p></div><div><p class=MsoNormal> total: nonzeros=250, allocated nonzeros=560<o:p></o:p></p></div><div><p class=MsoNormal> total number of mallocs used during MatSetValues calls =0<o:p></o:p></p></div><div><p class=MsoNormal> not using I-node (on process 0) routines<o:p></o:p></p></div><div><p class=MsoNormal>Norm of error 2.10144e-06 iterations 14<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Hong<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On Tue, Apr 16, 2013 at 1:17 PM, Jin, Shuangshuang <<a href="mailto:Shuangshuang.Jin@pnnl.gov" target="_blank">Shuangshuang.Jin@pnnl.gov</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Hello, everyone, I’m trying to run the following example: <a href="http://www.mcs.anl.gov/petsc/petsc-current/src/ksp/ksp/examples/tutorials/ex12.c.html" target="_blank">http://www.mcs.anl.gov/petsc/petsc-current/src/ksp/ksp/examples/tutorials/ex12.c.html</a><o:p></o:p></span></p></div><div><p class=MsoNormal> <span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>It is said that this example solves a linear system in parallel with KSP.<o:p></o:p></span></p></div><div><p class=MsoNormal> <span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>However, when I ran it on my clusters, I always got the same copy running multiple times. I printed the Istart and Iend numbers right after the MatGetOwnershipRange, and noticed that the index on each processor are all the same, which is [0, 56].<o:p></o:p></span></p></div><div><p class=MsoNormal> <span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>The following is the printout from the runs:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>[d3m956@olympus ksp]$ mpiexec -n 1 ./ex12<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>0, 56<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Norm of error 2.10144e-06 iterations 14<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>[d3m956@olympus ksp]$ mpiexec -n 2 ./ex12<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>0, 56<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>0, 56<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Norm of error 2.10144e-06 iterations 14<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Norm of error 2.10144e-06 iterations 14<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>[d3m956@olympus ksp]$ mpiexec -n 4 ./ex12<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>0, 56<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>0, 56<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>0, 56<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>0, 56<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Norm of error 2.10144e-06 iterations 14<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Norm of error 2.10144e-06 iterations 14<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Norm of error 2.10144e-06 iterations 14<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Norm of error 2.10144e-06 iterations 14<o:p></o:p></span></p></div><div><p class=MsoNormal> <span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Can anyone explain to me why I ran into this issue? Anything I missed? <o:p></o:p></span></p></div><div><p class=MsoNormal> <span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Thanks,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Shuangshuang<o:p></o:p></span></p></div><div><p class=MsoNormal> <span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal> <span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>