[petsc-users] Question with setting up KSP solver parameters.
Song Gao
song.gao2 at mail.mcgill.ca
Mon May 5 14:06:02 CDT 2014
Thank you.
Barry, Please see the attached log files.
Asmund, my apologize, I forget to make clean and recompile the code. But I
still don't see the full backtrace. I checked the compilation log and all
source files are compiled with -g flag.
==9475== Conditional jump or move depends on uninitialised value(s)
==9475== at 0x216F00F: SearchPath (in
/home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
==9475== by 0x216E854: mkl_cfg_file (in
/home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
==9475== by 0x216B27C: DDOT (in
/home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
==9475== by 0x1291768: VecNorm_Seq (bvec2.c:239)
==9475== by 0x126FA99: VecNorm (rvector.c:166)
==9475== by 0x1270A05: VecNormalize (rvector.c:261)
==9475== by 0x1405B6F: KSPGMRESCycle (gmres.c:127)
==9475== by 0x1406FC7: KSPSolve_GMRES (gmres.c:231)
==9475== by 0x1BEF5CE: KSPSolve (itfunc.c:446)
==9475== by 0x13F9C50: kspsolve_ (itfuncf.c:219)
==9475== by 0xC5EB87: petsolv_ (PETSOLV.F:375)
==9475== by 0x612C35: flowsol_ng_ (flowsol_ng.F:275)
==9475== Uninitialised value was created by a stack allocation
==9475== at 0x216EFE7: SearchPath (in
/home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
==9475==
==9475== Conditional jump or move depends on uninitialised value(s)
==9475== at 0x216F039: SearchPath (in
/home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
==9475== by 0x216E854: mkl_cfg_file (in
/home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
==9475== by 0x216B27C: DDOT (in
/home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
==9475== by 0x1291768: VecNorm_Seq (bvec2.c:239)
==9475== by 0x126FA99: VecNorm (rvector.c:166)
==9475== by 0x1270A05: VecNormalize (rvector.c:261)
==9475== by 0x1405B6F: KSPGMRESCycle (gmres.c:127)
==9475== by 0x1406FC7: KSPSolve_GMRES (gmres.c:231)
==9475== by 0x1BEF5CE: KSPSolve (itfunc.c:446)
==9475== by 0x13F9C50: kspsolve_ (itfuncf.c:219)
==9475== by 0xC5EB87: petsolv_ (PETSOLV.F:375)
==9475== by 0x612C35: flowsol_ng_ (flowsol_ng.F:275)
==9475== Uninitialised value was created by a stack allocation
==9475== at 0x216EFE7: SearchPath (in
/home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
==9475==
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 2.198671238042e+00 true resid norm
1.365127786174e-01 ||r(i)||/||b|| 1.419158195200e+01
3 KSP preconditioned resid norm 1.599921867950e+00 true resid norm
1.445986203309e-01 ||r(i)||/||b|| 1.503216908596e+01
...................
On Mon, May 5, 2014 at 1:33 PM, Åsmund Ervik <asmund.ervik at ntnu.no> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> You should also compile your own code "fensapngnew" with debug flags,
> specifically "-g" for gcc/gfortran or icc/ifort. This tells the
> compiler to generate the information necessary for gdb or valgrind to
> do their job. Then you would get more detailed information than just
>
> '''
> ==8222== Uninitialised value was created by a stack allocation
> ==8222== at 0x216E97F: SearchPath (in
> /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
> '''
>
> E.g. when I have an error, I get a full backtrace with line numbers in
> my source code, like:
> '''
> ==5277== Uninitialised value was created by a heap allocation
> ==5277== at 0x4C277AB: malloc (in
> /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
> ==5277== by 0x6BE3FE: __navier_stokes_MOD_rhs_ns (navier_stokes.f90:59)
> ==5277== by 0x6C712A: __rhs_MOD_dfdt_1phase (rhs.f90:109)
> ==5277== by 0x4EF52C: __rk_MOD_forward_euler (rk.f90:2168)
> ==5277== by 0x642764: __rk_wrapper_MOD_rk_step (rk_wrapper.f90:313)
> ==5277== by 0x7FA8B8: MAIN__ (meph.F90:179)
> ==5277== by 0x7FC5B9: main (meph.F90:2)
> ==5277==
> '''
>
>
> On 05. mai 2014 17:00, Song Gao wrote:
> > Thank you. Runing with mpirun -np 1 valgrind --track-origins=yes
> > ~/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG
> > -ksp_monitor_true_residual -ksp_view
> >
> > gives the following information.
> >
> > ==8222== Conditional jump or move depends on uninitialised
> > value(s) ==8222== at 0x216E9A7: SearchPath (in
> > /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
> > ==8222== by 0x216E1EC: mkl_cfg_file (in
> > /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
> > ==8222== by 0x216AC14: DDOT (in
> > /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
> > ==8222== by 0x1291100: VecNorm_Seq (bvec2.c:239) ==8222== by
> > 0x126F431: VecNorm (rvector.c:166) ==8222== by 0x127039D:
> > VecNormalize (rvector.c:261) ==8222== by 0x1405507:
> > KSPGMRESCycle (gmres.c:127) ==8222== by 0x140695F:
> > KSPSolve_GMRES (gmres.c:231) ==8222== by 0x1BEEF66: KSPSolve
> > (itfunc.c:446) ==8222== by 0x13F95E8: kspsolve_ (itfuncf.c:219)
> > ==8222== by 0xC5E51F: petsolv_ (PETSOLV.F:375) ==8222== by
> > 0x612C35: flowsol_ng_ (flowsol_ng.F:275) ==8222== Uninitialised
> > value was created by a stack allocation ==8222== at 0x216E97F:
> > SearchPath (in
> > /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
> > ==8222== ==8222== Conditional jump or move depends on uninitialised
> > value(s) ==8222== at 0x216E9D1: SearchPath (in
> > /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
> > ==8222== by 0x216E1EC: mkl_cfg_file (in
> > /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
> > ==8222== by 0x216AC14: DDOT (in
> > /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
> > ==8222== by 0x1291100: VecNorm_Seq (bvec2.c:239) ==8222== by
> > 0x126F431: VecNorm (rvector.c:166) ==8222== by 0x127039D:
> > VecNormalize (rvector.c:261) ==8222== by 0x1405507:
> > KSPGMRESCycle (gmres.c:127) ==8222== by 0x140695F:
> > KSPSolve_GMRES (gmres.c:231) ==8222== by 0x1BEEF66: KSPSolve
> > (itfunc.c:446) ==8222== by 0x13F95E8: kspsolve_ (itfuncf.c:219)
> > ==8222== by 0xC5E51F: petsolv_ (PETSOLV.F:375) ==8222== by
> > 0x612C35: flowsol_ng_ (flowsol_ng.F:275) ==8222== Uninitialised
> > value was created by a stack allocation ==8222== at 0x216E97F:
> > SearchPath (in
> > /home/cfd/sgao/mycodes/fensapngnew/bin/fensapMPI_LINUX64_DEBUG)
> > ==8222==
> >
> >
> >
> > On Mon, May 5, 2014 at 10:03 AM, Barry Smith <bsmith at mcs.anl.gov>
> > wrote:
> >
> >>
> >> If you run valgrind with the debug version of the libraries it
> >> will provide more information about the line numbers where the
> >> problem occurred, etc. recommend doing that.
> >>
> >> Either your initial solution or right hand side has garbage in it
> >> or the wrong blas may be being linked in. But there is definitely
> >> a problem
> >>
> >> Barry
> >>
> >> On May 5, 2014, at 8:28 AM, Song Gao <song.gao2 at mail.mcgill.ca>
> >> wrote:
> >>
> >>> 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
> >>> <bsmith at mcs.anl.gov> wrote:
> >>>
> >>> On May 2, 2014, at 5:29 PM, Song Gao <song.gao2 at mail.mcgill.ca>
> >>> 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"
> >>>>> <bsmith at mcs.anl.gov> 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
> >>>>>> <song.gao2 at mail.mcgill.ca>
> >> 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.
> >>>>>
> >>>
> >>>
> >>
> >>
> >
> -----BEGIN PGP SIGNATURE-----
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> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
>
> iQEcBAEBAgAGBQJTZ8t/AAoJED+FDAHgGz19xocH/i2A2Ccw3BTypkyicy6dqAQE
> wgVqukXnBI//adXHSe60uQBtL4OmjMiGOSt/Egye6N2QF/29yMzNdwTmHw6DZSRC
> C8yyPpVMEOPwB2WED0ui+IGSYq6JglOVplT5lCf2T99Y/gZNiqugCNz0ydnA5KnP
> 9W0O1yO2/2xgE4bMEibVhFIPsaXKGyTLv1ZjZLgdnbnTYFbCZqJk+9lVOOpQlqBZ
> mrzE+9GjO+0+BucEwI4Ekw4b9PI/Yctl0JW7zx+ZmviRsXRF4L3aO2SeFm1fBSnh
> XPIreXBNB6vyAmPFBx9TJZHQFucJIsFLHrlrea6onePKBx4Eg3JcpOlX8GdJr5w=
> =MkKg
> -----END PGP SIGNATURE-----
>
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