[petsc-dev] GAMG error with MKL

Tue Jul 3 18:35:40 CDT 2018

On Tue, Jul 3, 2018 at 1:00 PM Richard Tran Mills <rtmills at anl.gov> wrote:

> Hi Mark,
>
> I'm glad to see you trying out the AIJMKL stuff. I think you are the first
> person trying to actually use it, so we are probably going to expose some
> bugs and also some performance issues. My somewhat limited testing has
> shown that the MKL sparse routines often perform worse than our own
> implementations in PETSc.
>

My users just want OpenMP.

> We need to systematically look at this and let the MKL team know where
> performance is lagging.
>
> I'm able to run some GAMG examples with AIJMKL matrices if I use type
> MPIAIJ for my "parallel" matrices but SEQAIJMKL for the "sequential"
> matrices that MPIAIJ uses. Does your example work if you provide the option
> "-mat_seqaij_type seqaijmkl"?
>

Humm, maybe that is a better way to do it. I'll try it. I've been trying to
keep the MPI matrix as an MKL matrix but I guess that is not necessary.

>
> --Richard
>
> On Tue, Jul 3, 2018 at 6:28 AM, Mark Adams <mfadams at lbl.gov> wrote:
>
>> GAMG drills into AIJ data structures and will need to be fixed up to work
>> with MKL matrices, I guess, but it is failing now from a logic error.
>>
>> This example works with one processor but fails with 2 (appended). The
>> code looks like this:
>>
>>     ierr =
>> PetscObjectBaseTypeCompare((PetscObject)Amat,MATSEQAIJ,&isseqaij);CHKERRQ(ierr);
>>     ierr =
>> PetscObjectBaseTypeCompare((PetscObject)Amat,MATMPIAIJ,&ismpiaij);CHKERRQ(ierr);
>>     if (isseqaij) {
>>        ....
>>     } else if (ismpiaij) {
>>       .....
>>       ierr = MatMPIAIJGetSeqAIJ(Amat,&Daij,&Oaij,&garray);CHKERRQ(ierr);
>>
>> The failure below is from this call to MatMPIAIJGetSeqAIJ, on this line:
>>
>> ierr =
>> PetscObjectTypeCompare((PetscObject)A,MATMPIAIJ,&flg);CHKERRQ(ierr);
>>
>> The difference is PetscObjectTypeCompare vs PetscObject*Base*TypeCompare.
>> GAMG could use PetscObjectTypeCompare or MatMPIAIJGetSeqAIJ could use
>> PetscObject*Base*TypeCompare ...
>>
>> Mark
>>
>> srun -n 2 ./ex19 -pc_type gamg -snes_monitor_short -ksp_monitor_short
>>
>>
>> lid velocity = 0.0625, prandtl # = 1., grashof # = 1.
>>
>>
>>   0 SNES Function norm 0.239155
>>
>>
>> [0]PETSC ERROR: --------------------- Error Message
>> --------------------------------------------------------------
>>
>> [0]PETSC ERROR: No support for this operation for this object type
>>
>>
>> [0]PETSC ERROR: This function requires a MATMPIAIJ matrix as input
>>
>>
>> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html
>> for trouble shooting.
>>
>> [0]PETSC ERROR: Petsc Development GIT revision: v3.9.2-825-g3a11c7608d
>> GIT Date: 2018-07-01 06:15:09 +0200
>>
>> [0]PETSC ERROR:
>> /global/u2/m/madams/petsc_install/petsc/src/snes/examples/tutorials/./ex19
>> on a  named nid02516 by madams Tue Jul  3 04:58:13 2018
>>
>> [0]PETSC ERROR: Configure options --known-level1-dcache-size=32768
>> --known-level1-dcache-linesize=64 --known-level1-dcache-assoc=8
>> --known-sizeof-char=1 --known-sizeof-void-p=8 --known-sizeof-short=2
>> --known-sizeof-int=4 --known-sizeof-long=8 --known-sizeof-long-long=8
>> --known-sizeof-float=4 --known-sizeof-double=8 --known-sizeof-size_t=8
>> --known-bits-per-byte=8 --known-memcmp-ok=1 --known-sizeof-MPI_Comm=4
>> --known-sizeof-MPI_Fint=4 --known-mpi-long-double=1 --known-mpi-int64_t=1
>> --known-mpi-c-double-complex=1 --known-mklspblas-supports-zero-based=0
>> --known-has-attribute-aligned=1 --with-cc=cc --with-cxx=CC --with-fc=ftn
>> COPTFLAGS="  -g -O1 -mkl -static-intel" CXXOPTFLAGS="-g -O1 -mkl
>> -static-intel" FOPTFLAGS="  -g -O1 -mkl -static-intel" --download-metis=1
>> --with-hypre-dir=/global/homes/m/madams/tmp/hypre32-2.14.0
>> --download-parmetis=1
>> LIBS="-L/opt/intel/compilers_and_libraries_2018.1.163/linux/mkl/lib/intel64
>> -lmkl_intel_lp64 -lmkl_intel_thread -lmkl_core -liomp5 -lpthread"
>> --with-blaslapack-include=/opt/intel/compilers_and_libraries_2018.1.163/linux/mkl/include
>> --with-debugging=0 --with-mpiexec=srun --with-batch=1
>> --known-mpi-shared-libraries=1 --known-64-bit-blas-indices=0
>> --with-64-bit-indices=0 PETSC_ARCH=arch-cori-knl-opt-intel-omp
>> --with-openmp=1 --download-p4est=0 --with-x=0
>> --prefix=/global/homes/m/madams/petsc_install/petsc-cori-knl-opt-intel-omp
>> PETSC_DIR=/global/homes/m/madams/petsc_install/petsc
>> [0]PETSC ERROR: #1 MatMPIAIJGetSeqAIJ() line 4328 in
>> /global/u2/m/madams/petsc_install/petsc/src/mat/impls/aij/mpi/mpiaij.c
>> [0]PETSC ERROR: #2 PCGAMGCreateGraph() line 118 in
>> /global/u2/m/madams/petsc_install/petsc/src/ksp/pc/impls/gamg/util.c
>> [0]PETSC ERROR: #3 PCGAMGGraph_AGG() line 832 in
>> /global/u2/m/madams/petsc_install/petsc/src/ksp/pc/impls/gamg/agg.c
>> [0]PETSC ERROR: #4 PCSetUp_GAMG() line 517 in
>> /global/u2/m/madams/petsc_install/petsc/src/ksp/pc/impls/gamg/gamg.c
>> [0]PETSC ERROR: #5 PCSetUp() line 932 in
>> /global/u2/m/madams/petsc_install/petsc/src/ksp/pc/interface/precon.c
>> [0]PETSC ERROR: #6 KSPSetUp() line 381 in
>> /global/u2/m/madams/petsc_install/petsc/src/ksp/ksp/interface/itfunc.c
>> [0]PETSC ERROR: #7 KSPSolve() line 612 in
>> /global/u2/m/madams/petsc_install/petsc/src/ksp/ksp/interface/itfunc.c
>> [0]PETSC ERROR: #8 SNESSolve_NEWTONLS() line 224 in
>> /global/u2/m/madams/petsc_install/petsc/src/snes/impls/ls/ls.c
>> [0]PETSC ERROR: #9 SNESSolve() line 4350 in
>> /global/u2/m/madams/petsc_install/petsc/src/snes/interface/snes.c
>> [0]PETSC ERROR: #10 main() line 161 in
>> /global/homes/m/madams/petsc_install/petsc/src/snes/examples/tutorials/ex19.c
>> [0]PETSC ERROR: PETSc Option Table entries:
>> [0]PETSC ERROR: -ksp_monitor_short
>> [0]PETSC ERROR: -mat_type aijmkl
>> [0]PETSC ERROR: -options_left
>> [0]PETSC ERROR: -pc_type gamg
>> [0]PETSC ERROR: -snes_monitor_short
>>
>>
>
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