[petsc-users] PetscLogFlops Error
Karl Yang
y.juntao at hotmail.com
Sun Jul 19 01:52:29 CDT 2020
Hi, Barry,
Thanks for your reply. I see the issue and I think I can now continue my work with a quick fix as you suggested.
Regards
JT
On Jul 19 2020, at 1:26 pm, Barry Smith <bsmith at petsc.dev> wrote:
>
>
> > On Jul 18, 2020, at 11:27 PM, Karl Yang <y.juntao at hotmail.com> wrote:
> >
> >
> > Hello,
> >
> > I was using FGMRES solver with fieldsplit preconditioner for solving a fluid equation.
> > I have the code ran for coarser meshes and it works fine. But when I got it to run for very fine meshes I encountered the PetscLogFlops error.
> >
> > The following is the output of error and the output from kspview.
> >
> > [7]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
> > [7]PETSC ERROR: Argument out of range
> > [7]PETSC ERROR: Cannot log negative flops
> > [7]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting.
> > [7]PETSC ERROR: Petsc Release Version 3.12.5, Mar, 29, 2020
> > [7]PETSC ERROR: ./testSolve on a arch-linux2-c-debug named hsw222 by yjuntao Sat Jul 18 20:30:05 2020
> > [7]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++ --with-fc=gfortran --download-mpich --download-fblaslapack --with-cuda
> > [7]PETSC ERROR: #1 PetscLogFlops() line 232 in /usr/local/petsc/petsc-3.12.5/include/petsclog.h
> > [7]PETSC ERROR: #2 MatSolve_SeqAIJ() line 3200 in /usr/local/petsc/petsc-3.12.5/src/mat/impls/aij/seq/aijfact.c
> > [7]PETSC ERROR: #3 MatSolve() line 3290 in /usr/local/petsc/petsc-3.12.5/src/mat/interface/matrix.c
> > [7]PETSC ERROR: #4 PCApply_LU() line 177 in /usr/local/petsc/petsc-3.12.5/src/ksp/pc/impls/factor/lu/lu.c
> > [7]PETSC ERROR: #5 PCApply() line 444 in /usr/local/petsc/petsc-3.12.5/src/ksp/pc/interface/precon.c
> > [7]PETSC ERROR: #6 KSP_PCApply() line 281 in /usr/local/petsc/petsc-3.12.5/include/petsc/private/kspimpl.h
> > [7]PETSC ERROR: #7 KSPInitialResidual() line 65 in /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itres.c
> > [7]PETSC ERROR: #8 KSPSolve_GMRES() line 236 in /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/impls/gmres/gmres.c
> > [7]PETSC ERROR: #9 KSPSolve() line 760 in /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itfunc.c
> > [7]PETSC ERROR: #10 PCApply_FieldSplit_Schur() line 1180 in /usr/local/petsc/petsc-3.12.5/src/ksp/pc/impls/fieldsplit/fieldsplit.c
> > [7]PETSC ERROR: #11 PCApply() line 444 in /usr/local/petsc/petsc-3.12.5/src/ksp/pc/interface/precon.c
> > [7]PETSC ERROR: #12 KSP_PCApply() line 281 in /usr/local/petsc/petsc-3.12.5/include/petsc/private/kspimpl.h
> > [7]PETSC ERROR: #13 KSPFGMRESCycle() line 166 in /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/impls/gmres/fgmres/fgmres.c
> > [7]PETSC ERROR: #14 KSPSolve_FGMRES() line 291 in /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/impls/gmres/fgmres/fgmres.c
> > [7]PETSC ERROR: #15 KSPSolve() line 760 in /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itfunc.c
> >
>
> PetscErrorCode MatSolve_SeqAIJ(Mat A,Vec bb,Vec xx)
> {
> Mat_SeqAIJ *a = (Mat_SeqAIJ*)A->data;
> IS iscol = a->col,isrow = a->row;
> PetscErrorCode ierr;
> PetscInt i,n=A->rmap->n,*vi,*ai=a->i,*aj=a->j,*adiag = a->diag,nz;
> const PetscInt *rout,*cout,*r,*c;
> PetscScalar *x,*tmp,sum;
> const PetscScalar *b;
> const MatScalar *aa = a->a,*v;
>
> PetscFunctionBegin;
> if (!n) PetscFunctionReturn(0);
>
> ......
> ierr = PetscLogFlops(2*a->nz - A->cmap->n);CHKERRQ(ierr);
> PetscFunctionReturn(0);
>
> Could maybe be integer overflow where a->nz fits but 2*a->nz doesn't fit so it results in a negative integer that is then converted to a negative floating point number.
> It should have a 2.0*a->nz but we must have missed this place in the code. We can fix this.
> > There is some issues during kspview if PCLSC is used as shown below. But the code could be ran if I do not show ksp details.
> > In order to show the whole ksp setup, I also attached another kspview output without PCLSC.
> > ======================kspview output ==============================
> > KSP Object: 1 MPI processes
> > type: fgmres
> > restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement
> > happy breakdown tolerance 1e-30
> > maximum iterations=10000, initial guess is zero
> > tolerances: relative=1e-08, absolute=1e-50, divergence=10000.
> > right preconditioning
> > using UNPRECONDITIONED norm type for convergence test
> > PC Object: 1 MPI processes
> > type: fieldsplit
> > FieldSplit with Schur preconditioner, blocksize = 1, factorization FULL
> > Preconditioner for the Schur complement formed from S itself
> > Split info:
> > Split number 0 Defined by IS
> > Split number 1 Defined by IS
> > KSP solver for A00 block
> > KSP Object: (fieldsplit_0_) 1 MPI processes
> > type: gmres
> > restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement
> > happy breakdown tolerance 1e-30
> > maximum iterations=10000, initial guess is zero
> > tolerances: relative=1e-05, absolute=1e-50, divergence=10000.
> > left preconditioning
> > using DEFAULT norm type for convergence test
> > PC Object: (fieldsplit_0_) 1 MPI processes
> > type: lu
> > PC has not been set up so information may be incomplete
> > out-of-place factorization
> > tolerance for zero pivot 2.22045e-14
> > matrix ordering: nd
> > linear system matrix = precond matrix:
> > Mat Object: (fieldsplit_0_) 1 MPI processes
> > type: seqaijcusparse
> > rows=8396802, cols=8396802
> > total: nonzeros=75440146, allocated nonzeros=75440146
> > total number of mallocs used during MatSetValues calls=0
> > not using I-node routines
> > KSP solver for S = A11 - A10 inv(A00) A01
> > KSP Object: (fieldsplit_1_) 1 MPI processes
> > type: gmres
> > restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement
> > happy breakdown tolerance 1e-30
> > maximum iterations=10000, initial guess is zero
> > tolerances: relative=1e-05, absolute=1e-50, divergence=10000.
> > left preconditioning
> > using DEFAULT norm type for convergence test
> > PC Object: (fieldsplit_1_) 1 MPI processes
> > type: lsc
> > PC has not been set up so information may be incomplete
> > [0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
> > [0]PETSC ERROR: Null argument, when expecting valid pointer
> > [0]PETSC ERROR: Null Object: Parameter # 1
> > [0]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting.
> > [0]PETSC ERROR: Petsc Release Version 3.12.5, Mar, 29, 2020
> > [0]PETSC ERROR: ./testSolve on a arch-linux2-c-debug named hsw221 by yjuntao Sat Jul 18 21:08:42 2020
> > [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++ --with-fc=gfortran --download-mpich --download-fblaslapack --with-cuda
> > [0]PETSC ERROR: #1 KSPView() line 111 in /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itcreate.c
> > [0]PETSC ERROR: #2 PCView_LSC() line 142 in /usr/local/petsc/petsc-3.12.5/src/ksp/pc/impls/lsc/lsc.c
> > [0]PETSC ERROR: #3 PCView() line 1588 in /usr/local/petsc/petsc-3.12.5/src/ksp/pc/interface/precon.c
> > [0]PETSC ERROR: #4 KSPView() line 217 in /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itcreate.c
> > [0]PETSC ERROR: #5 PCView_FieldSplit_Schur() line 238 in /usr/local/petsc/petsc-3.12.5/src/ksp/pc/impls/fieldsplit/fieldsplit.c
> > [0]PETSC ERROR: #6 PCView() line 1588 in /usr/local/petsc/petsc-3.12.5/src/ksp/pc/interface/precon.c
> > [0]PETSC ERROR: #7 KSPView() line 217 in /usr/local/petsc/petsc-3.12.5/src/ksp/ksp/interface/itcreate.c
>
> This is something we can fix. Since the LSC has not been setup yet it should skip the KSPView on the KSP that has not yet been created.
> static PetscErrorCode PCView_LSC(PC pc,PetscViewer viewer)
> {
> PC_LSC *jac = (PC_LSC*)pc->data;
> PetscErrorCode ierr;
> PetscBool iascii;
>
> PetscFunctionBegin;
> ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr);
> if (iascii) {
> ierr = PetscViewerASCIIPushTab(viewer);CHKERRQ(ierr);
> ierr = KSPView(jac->kspL,viewer);CHKERRQ(ierr);
> ierr = PetscViewerASCIIPopTab(viewer);CHKERRQ(ierr);
> }
> PetscFunctionReturn(0);
> }
>
> >
> > =====================KSP without PCLSC======================================
> > KSP Object: 1 MPI processes
> > type: fgmres
> > restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement
> > happy breakdown tolerance 1e-30
> > maximum iterations=10000, initial guess is zero
> > tolerances: relative=1e-08, absolute=1e-50, divergence=10000.
> > right preconditioning
> > using UNPRECONDITIONED norm type for convergence test
> > PC Object: 1 MPI processes
> > type: fieldsplit
> > FieldSplit with Schur preconditioner, blocksize = 1, factorization FULL
> > Preconditioner for the Schur complement formed from S itself
> > Split info:
> > Split number 0 Defined by IS
> > Split number 1 Defined by IS
> > KSP solver for A00 block
> > KSP Object: (fieldsplit_0_) 1 MPI processes
> > type: gmres
> > restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement
> > happy breakdown tolerance 1e-30
> > maximum iterations=10000, initial guess is zero
> > tolerances: relative=1e-05, absolute=1e-50, divergence=10000.
> > left preconditioning
> > using DEFAULT norm type for convergence test
> > PC Object: (fieldsplit_0_) 1 MPI processes
> > type: lu
> > PC has not been set up so information may be incomplete
> > out-of-place factorization
> > tolerance for zero pivot 2.22045e-14
> > matrix ordering: nd
> > linear system matrix = precond matrix:
> > Mat Object: (fieldsplit_0_) 1 MPI processes
> > type: seqaijcusparse
> > rows=8396802, cols=8396802
> > total: nonzeros=75440146, allocated nonzeros=75440146
> > total number of mallocs used during MatSetValues calls=0
> > not using I-node routines
> > KSP solver for S = A11 - A10 inv(A00) A01
> > KSP Object: (fieldsplit_1_) 1 MPI processes
> > type: gmres
> > restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement
> > happy breakdown tolerance 1e-30
> > maximum iterations=10000, initial guess is zero
> > tolerances: relative=1e-05, absolute=1e-50, divergence=10000.
> > left preconditioning
> > using DEFAULT norm type for convergence test
> > PC Object: (fieldsplit_1_) 1 MPI processes
> > type: none
> > PC has not been set up so information may be incomplete
> > linear system matrix = precond matrix:
> > Mat Object: (fieldsplit_1_) 1 MPI processes
> > type: schurcomplement
> > rows=1050625, cols=1050625
> > Schur complement A11 - A10 inv(A00) A01
> > A11
> > Mat Object: (fieldsplit_1_) 1 MPI processes
> > type: seqaijcusparse
> > rows=1050625, cols=1050625
> > total: nonzeros=0, allocated nonzeros=0
> > total number of mallocs used during MatSetValues calls=0
> > not using I-node routines
> > A10
> > Mat Object: 1 MPI processes
> > type: seqaijcusparse
> > rows=1050625, cols=8396802
> > total: nonzeros=44060674, allocated nonzeros=44060674
> > total number of mallocs used during MatSetValues calls=0
> > not using I-node routines
> > KSP of A00
> > KSP Object: (fieldsplit_0_) 1 MPI processes
> > type: gmres
> > restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement
> > happy breakdown tolerance 1e-30
> > maximum iterations=10000, initial guess is zero
> > tolerances: relative=1e-05, absolute=1e-50, divergence=10000.
> > left preconditioning
> > using DEFAULT norm type for convergence test
> > PC Object: (fieldsplit_0_) 1 MPI processes
> > type: lu
> > PC has not been set up so information may be incomplete
> > out-of-place factorization
> > tolerance for zero pivot 2.22045e-14
> > matrix ordering: nd
> > linear system matrix = precond matrix:
> > Mat Object: (fieldsplit_0_) 1 MPI processes
> > type: seqaijcusparse
> > rows=8396802, cols=8396802
> > total: nonzeros=75440146, allocated nonzeros=75440146
> > total number of mallocs used during MatSetValues calls=0
> > not using I-node routines
> > A01
> > Mat Object: 1 MPI processes
> > type: seqaijcusparse
> > rows=8396802, cols=1050625
> > total: nonzeros=43995146, allocated nonzeros=43995146
> > total number of mallocs used during MatSetValues calls=0
> > not using I-node routines
> > linear system matrix = precond matrix:
> > Mat Object: 1 MPI processes
> > type: seqaijcusparse
> > rows=9447427, cols=9447427
> > total: nonzeros=163495966, allocated nonzeros=163643398
> > total number of mallocs used during MatSetValues calls=0
> > not using I-node routines
> >
> > Regards
> > JT
>
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