Thanks for reply. What do you mean by a “happier” state? I check the converged solution (the one which call kspgmressetrestart twice), the solution should be correct.
I run with valgrind both codes (one call kspgmressetrestart once and another call kspgmressetrestart twice) Both of them have the errors: what does this mean? Thank you in advance. ==7858== Conditional jump or move depends on uninitialised value(s) ==7858== at 0xE71DFB: SearchPath (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0xE71640: mkl_cfg_file (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0xE6E068: DDOT (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x73281A: VecNorm_Seq (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x730BF4: VecNormalize (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x7BC5A8: KSPSolve_GMRES (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0xB8A06E: KSPSolve (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x7B659F: kspsolve_ (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x5EAE84: petsolv_ (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x4ECD46: flowsol_ng_ (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x507E4E: iterprc_ (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x51D1B4: solnalg_ (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== ==7858== Conditional jump or move depends on uninitialised value(s) ==7858== at 0xE71E25: SearchPath (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0xE71640: mkl_cfg_file (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0xE6E068: DDOT (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x73281A: VecNorm_Seq (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x730BF4: VecNormalize (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x7BC5A8: KSPSolve_GMRES (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0xB8A06E: KSPSolve (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x7B659F: kspsolve_ (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x5EAE84: petsolv_ (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x4ECD46: flowsol_ng_ (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x507E4E: iterprc_ (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== by 0x51D1B4: solnalg_ (in /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64) ==7858== On Fri, May 2, 2014 at 7:25 PM, Barry Smith <[email protected]> wrote: > > On May 2, 2014, at 5:29 PM, Song Gao <[email protected]> wrote: > > > Thanks for your quick reply. What confused me is that why would the > code works fine if I reset the gmres restart number by recalling > kspgmressetrestart just before kspsolve? > > It isn’t really working. Something is going wrong (run with valgrind) > and setting that restart number and starting the solver just puts it in a > “happier” state so it seems to make more progress. > > Barry > > > > > Sent from my iPhone > > > >> On May 2, 2014, at 6:03 PM, "Barry Smith" <[email protected]> wrote: > >> > >> > >> Your shell matrix is buggy in some way. Whenever the residual norm > jumps like crazy at a restart it means that something is wrong with the > operator. > >> > >> Barry > >> > >>> On May 2, 2014, at 4:41 PM, Song Gao <[email protected]> wrote: > >>> > >>> Dear PETSc users, > >>> > >>> I'm solving a linear system in KSP and trying to setup the solver in > codes. But I feel strange because my codes don't converge unless I call > KSPGMRESSetRestart twice. > >>> > >>> My codes looks like > >>> > >>> call KSPSetOperators ( pet_solv, pet_mat_mf_shell, pet_matp, > DIFFERENT_NONZERO_PATTERN, ierpetsc ) > >>> call KSPSetType ( pet_solv, 'gmres', ierpetsc ) > >>> call KSPGMRESSetRestart ( pet_solv, 30, ierpetsc ) > >>> call KSPGetPC ( pet_solv, pet_precon, ierpetsc ) > >>> call PCSetType ( pet_precon, 'asm', ierpetsc ) > >>> call PCASMSetOverlap ( pet_precon, 1, ierpetsc ) > >>> call KSPSetUp ( pet_solv, ierpetsc ) > >>> call PCASMGetSubKSP ( pet_precon, n_local, first_local, pet_solv_sub, > ierpetsc ) ! n_local is one > >>> call KSPGetPC ( pet_solv_sub(1), pet_precon_sub, ierpetsc ) > >>> call PCSetType ( pet_precon_sub, 'jacobi', ierpetsc ) > >>> call PCJacobiSetUseRowMax ( pet_precon_sub, ierpetsc ) > >>> call KSPSetFromOptions ( pet_solv, ierpetsc ) > >>> call KSPGMRESSetRestart ( pet_solv, 29, ierpetsc ) ! adding > this line, the codes converge > >>> call KSPSolve ( pet_solv, pet_rhsp, pet_solup, ierpetsc ) > >>> > >>> runing with 1 CPU WITHOUT the line with red color and the codes don't > converge > >>> > >>> runtime options: -ksp_monitor_true_residual -ksp_view > >>> 0 KSP preconditioned resid norm 6.585278940829e+00 true resid norm > 9.619278462343e-03 ||r(i)||/||b|| 1.000000000000e+00 > >>> 1 KSP preconditioned resid norm 6.585278219510e+00 true resid norm > 9.619278462343e-03 ||r(i)||/||b|| 1.000000000000e+00 > >>> 2 KSP preconditioned resid norm 2.198638170622e+00 true resid norm > 1.365132713014e-01 ||r(i)||/||b|| 1.419163317039e+01 > >>> 3 KSP preconditioned resid norm 1.599896387215e+00 true resid norm > 1.445988845022e-01 ||r(i)||/||b|| 1.503219654865e+01 > >>> ....... > >>> 28 KSP preconditioned resid norm 4.478466011191e-01 true resid norm > 1.529879309381e-01 ||r(i)||/||b|| 1.590430420920e+01 > >>> 29 KSP preconditioned resid norm 4.398129572260e-01 true resid norm > 1.530132924055e-01 ||r(i)||/||b|| 1.590694073413e+01 > >>> 30 KSP preconditioned resid norm 2.783227613716e+12 true resid norm > 1.530369123550e-01 ||r(i)||/||b|| 1.590939621450e+01 > >>> > >>> KSP Object: 1 MPI processes > >>> type: gmres > >>> GMRES: restart=30, using Classical (unmodified) Gram-Schmidt > Orthogonalization with no iterative refinement > >>> GMRES: happy breakdown tolerance 1e-30 > >>> maximum iterations=10000, initial guess is zero > >>> tolerances: relative=1e-05, absolute=1e-50, divergence=10000 > >>> left preconditioning > >>> using PRECONDITIONED norm type for convergence test > >>> PC Object: 1 MPI processes > >>> type: asm > >>> Additive Schwarz: total subdomain blocks = 1, amount of overlap = 1 > >>> Additive Schwarz: restriction/interpolation type - RESTRICT > >>> [0] number of local blocks = 1 > >>> Local solve info for each block is in the following KSP and PC > objects: > >>> - - - - - - - - - - - - - - - - - - > >>> [0] local block number 0, size = 22905 > >>> KSP Object: (sub_) 1 MPI processes > >>> type: preonly > >>> maximum iterations=10000, initial guess is zero > >>> tolerances: relative=1e-05, absolute=1e-50, divergence=10000 > >>> left preconditioning > >>> using NONE norm type for convergence test > >>> PC Object: (sub_) 1 MPI processes > >>> type: jacobi > >>> linear system matrix = precond matrix: > >>> Matrix Object: 1 MPI processes > >>> type: seqbaij > >>> rows=22905, cols=22905, bs=5 > >>> total: nonzeros=785525, allocated nonzeros=785525 > >>> total number of mallocs used during MatSetValues calls =0 > >>> block size is 5 > >>> - - - - - - - - - - - - - - - - - - > >>> linear system matrix followed by preconditioner matrix: > >>> Matrix Object: 1 MPI processes > >>> type: shell > >>> rows=22905, cols=22905 > >>> Matrix Object: 1 MPI processes > >>> type: seqbaij > >>> rows=22905, cols=22905, bs=5 > >>> total: nonzeros=785525, allocated nonzeros=785525 > >>> total number of mallocs used during MatSetValues calls =0 > >>> block size is 5 > >>> WARNING: zero iteration in iterative solver > >>> > >>> runing with 1 CPU WITH the line with red color and the codes converge > >>> > >>> runtime options: -ksp_monitor_true_residual -ksp_view > >>> 0 KSP preconditioned resid norm 6.585278940829e+00 true resid norm > 9.619278462343e-03 ||r(i)||/||b|| 1.000000000000e+00 > >>> 1 KSP preconditioned resid norm 2.566248171026e+00 true resid norm > 4.841043870812e-03 ||r(i)||/||b|| 5.032647604250e-01 > >>> 2 KSP preconditioned resid norm 1.410418402651e+00 true resid norm > 3.347509391208e-03 ||r(i)||/||b|| 3.480000505561e-01 > >>> 3 KSP preconditioned resid norm 9.665409287757e-01 true resid norm > 2.289877121679e-03 ||r(i)||/||b|| 2.380508195748e-01 > >>> 4 KSP preconditioned resid norm 4.469486152454e-01 true resid norm > 1.283813398084e-03 ||r(i)||/||b|| 1.334625463968e-01 > >>> 5 KSP preconditioned resid norm 2.474889829653e-01 true resid norm > 7.956009139680e-04 ||r(i)||/||b|| 8.270900120862e-02 > >>> ............ > >>> 24 KSP preconditioned resid norm 9.518780877620e-05 true resid norm > 6.273993696172e-07 ||r(i)||/||b|| 6.522312167937e-05 > >>> 25 KSP preconditioned resid norm 6.837876679998e-05 true resid norm > 4.612861071815e-07 ||r(i)||/||b|| 4.795433555514e-05 > >>> 26 KSP preconditioned resid norm 4.864361942316e-05 true resid norm > 3.394754589076e-07 ||r(i)||/||b|| 3.529115621682e-05 > >>> KSP Object: 1 MPI processes > >>> type: gmres > >>> GMRES: restart=29, using Classical (unmodified) Gram-Schmidt > Orthogonalization with no iterative refinement > >>> GMRES: happy breakdown tolerance 1e-30 > >>> maximum iterations=10000, initial guess is zero > >>> tolerances: relative=1e-05, absolute=1e-50, divergence=10000 > >>> left preconditioning > >>> using PRECONDITIONED norm type for convergence test > >>> PC Object: 1 MPI processes > >>> type: asm > >>> Additive Schwarz: total subdomain blocks = 1, amount of overlap = 1 > >>> Additive Schwarz: restriction/interpolation type - RESTRICT > >>> [0] number of local blocks = 1 > >>> Local solve info for each block is in the following KSP and PC > objects: > >>> - - - - - - - - - - - - - - - - - - > >>> [0] local block number 0, size = 22905 > >>> KSP Object: (sub_) 1 MPI processes > >>> type: preonly > >>> maximum iterations=10000, initial guess is zero > >>> tolerances: relative=1e-05, absolute=1e-50, divergence=10000 > >>> left preconditioning > >>> using NONE norm type for convergence test > >>> PC Object: (sub_) 1 MPI processes > >>> type: jacobi > >>> linear system matrix = precond matrix: > >>> Matrix Object: 1 MPI processes > >>> type: seqbaij > >>> rows=22905, cols=22905, bs=5 > >>> total: nonzeros=785525, allocated nonzeros=785525 > >>> total number of mallocs used during MatSetValues calls =0 > >>> block size is 5 > >>> - - - - - - - - - - - - - - - - - - > >>> linear system matrix followed by preconditioner matrix: > >>> Matrix Object: 1 MPI processes > >>> type: shell > >>> rows=22905, cols=22905 > >>> Matrix Object: 1 MPI processes > >>> type: seqbaij > >>> rows=22905, cols=22905, bs=5 > >>> total: nonzeros=785525, allocated nonzeros=785525 > >>> total number of mallocs used during MatSetValues calls =0 > >>> block size is 5 > >>> WARNING: zero iteration in iterative solver > >>> > >>> > >>> What would be my error here? Thank you. > >> > >
