[petsc-dev] Kokkos/Crusher perforance

Wed Jan 26 08:44:01 CST 2022

I am not able to reproduce this with a small problem. 2 nodes or less
refinement works. This is from the 8 node test, the -dm_refine 5 version.
I see that it comes from PtAP.
This is on the fine grid. (I was thinking it could be on a reduced grid
with idle processors, but no)

[15]PETSC ERROR: Argument out of range
[15]PETSC ERROR: Key <= 0
[15]PETSC ERROR: See https://petsc.org/release/faq/ for trouble shooting.
[15]PETSC ERROR: Petsc Development GIT revision: v3.16.3-696-g46640c56cb
 GIT Date: 2022-01-25 09:20:51 -0500
[15]PETSC ERROR:
/gpfs/alpine/csc314/scratch/adams/petsc/src/snes/tests/data/../ex13 on a
arch-olcf-crusher named crusher020 by adams Wed Jan 26 08:35:47 2022
[15]PETSC ERROR: Configure options --with-cc=cc --with-cxx=CC --with-fc=ftn
--with-fortran-bindings=0 LIBS="-L/opt/cray/pe/mpich/8.1.12/gtl/lib
-lmpi_gtl_hsa" --with-debugging=0 --COPTFLAGS="-g -O" --CXXOPTFLAGS="-g -O"
--FOPTFLAGS=-g --with-mpiexec="srun -p batch -N 1 -A csc314_crusher -t
00:10:00" --with-hip --with-hipc=hipcc --download-hypre
--with-hip-arch=gfx90a --download-kokkos --download-kokkos-kernels
--with-kokkos-kernels-tpl=0 --download-p4est=1
--with-zlib-dir=/sw/crusher/spack-envs/base/opt/cray-sles15-zen3/cce-13.0.0/zlib-1.2.11-qx5p4iereg4sjvfi5uwk6jn56o6se2q4
PETSC_ARCH=arch-olcf-crusher
[15]PETSC ERROR: #1 PetscTableFind() at
/gpfs/alpine/csc314/scratch/adams/petsc/include/petscctable.h:131
[15]PETSC ERROR: #2 MatSetUpMultiply_MPIAIJ() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/mat/impls/aij/mpi/mmaij.c:35
[15]PETSC ERROR: #3 MatAssemblyEnd_MPIAIJ() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/mat/impls/aij/mpi/mpiaij.c:735
[15]PETSC ERROR: #4 MatAssemblyEnd_MPIAIJKokkos() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/mat/impls/aij/mpi/kokkos/mpiaijkok.kokkos.cxx:14
[15]PETSC ERROR: #5 MatAssemblyEnd() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/mat/interface/matrix.c:5678
[15]PETSC ERROR: #6 MatSetMPIAIJKokkosWithSplitSeqAIJKokkosMatrices() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/mat/impls/aij/mpi/kokkos/mpiaijkok.kokkos.cxx:267
[15]PETSC ERROR: #7 MatSetMPIAIJKokkosWithGlobalCSRMatrix() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/mat/impls/aij/mpi/kokkos/mpiaijkok.kokkos.cxx:825
[15]PETSC ERROR: #8 MatProductSymbolic_MPIAIJKokkos() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/mat/impls/aij/mpi/kokkos/mpiaijkok.kokkos.cxx:1167
[15]PETSC ERROR: #9 MatProductSymbolic() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/mat/interface/matproduct.c:825
[15]PETSC ERROR: #10 MatPtAP() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/mat/interface/matrix.c:9656
[15]PETSC ERROR: #11 PCGAMGCreateLevel_GAMG() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/ksp/pc/impls/gamg/gamg.c:87
[15]PETSC ERROR: #12 PCSetUp_GAMG() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/ksp/pc/impls/gamg/gamg.c:663
[15]PETSC ERROR: #13 PCSetUp() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/ksp/pc/interface/precon.c:1017
[15]PETSC ERROR: #14 KSPSetUp() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/ksp/ksp/interface/itfunc.c:417
[15]PETSC ERROR: #15 KSPSolve_Private() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/ksp/ksp/interface/itfunc.c:863
[15]PETSC ERROR: #16 KSPSolve() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/ksp/ksp/interface/itfunc.c:1103
[15]PETSC ERROR: #17 SNESSolve_KSPONLY() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/snes/impls/ksponly/ksponly.c:51
[15]PETSC ERROR: #18 SNESSolve() at
/gpfs/alpine/csc314/scratch/adams/petsc/src/snes/interface/snes.c:4810
[15]PETSC ERROR: #19 main() at ex13.c:169
[15]PETSC ERROR: PETSc Option Table entries:
[15]PETSC ERROR: -benchmark_it 10

On Wed, Jan 26, 2022 at 7:26 AM Mark Adams <mfadams at lbl.gov> wrote:

> The GPU aware MPI is dying going 1 to 8 nodes, 8 processes per node.
> I will make a minimum reproducer. start with 2 nodes, one process on each
> node.
>
>
> On Tue, Jan 25, 2022 at 10:19 PM Barry Smith <bsmith at petsc.dev> wrote:
>
>>
>>   So the MPI is killing you in going from 8 to 64. (The GPU flop rate
>> scales almost perfectly, but the overall flop rate is only half of what it
>> should be at 64).
>>
>> On Jan 25, 2022, at 9:24 PM, Mark Adams <mfadams at lbl.gov> wrote:
>>
>> It looks like we have our instrumentation and job configuration in decent
>> shape so on to scaling with AMG.
>> In using multiple nodes I got errors with table entries not found, which
>> can be caused by a buggy MPI, and the problem does go away when I turn GPU
>> aware MPI off.
>> Jed's analysis, if I have this right, is that at *0.7T* flops we are at
>> about 35% of theoretical peal wrt memory bandwidth.
>> I run out of memory with the next step in this study (7 levels of
>> refinement), with 2M equations per GPU. This seems low to me and we will
>> see if we can fix this.
>> So this 0.7Tflops is with only 1/4 M equations so 35% is not terrible.
>> Here are the solve times with 001, 008 and 064 nodes, and 5 or 6 levels
>> of refinement.
>>
>> out_001_kokkos_Crusher_5_1.txt:KSPSolve              10 1.0 1.2933e+00
>> 1.0 4.13e+10 1.1 1.8e+05 8.4e+03 5.8e+02  3 87 86 78 48 100100100100100
>> 248792   423857   6840 3.85e+02 6792 3.85e+02 100
>> out_001_kokkos_Crusher_6_1.txt:KSPSolve              10 1.0 5.3667e+00
>> 1.0 3.89e+11 1.0 2.1e+05 3.3e+04 6.7e+02  2 87 86 79 48 100100100100100
>> 571572   *700002*   7920 1.74e+03 7920 1.74e+03 100
>> out_008_kokkos_Crusher_5_1.txt:KSPSolve              10 1.0 1.9407e+00
>> 1.0 4.94e+10 1.1 3.5e+06 6.2e+03 6.7e+02  5 87 86 79 47 100100100100100
>> 1581096   3034723   7920 6.88e+02 7920 6.88e+02 100
>> out_008_kokkos_Crusher_6_1.txt:KSPSolve              10 1.0 7.4478e+00
>> 1.0 4.49e+11 1.0 4.1e+06 2.3e+04 7.6e+02  2 88 87 80 49 100100100100100
>> 3798162   5557106   9367 3.02e+03 9359 3.02e+03 100
>> out_064_kokkos_Crusher_5_1.txt:KSPSolve              10 1.0 2.4551e+00
>> 1.0 5.40e+10 1.1 4.2e+07 5.4e+03 7.3e+02  5 88 87 80 47 100100100100100
>> 11065887   23792978   8684 8.90e+02 8683 8.90e+02 100
>> out_064_kokkos_Crusher_6_1.txt:KSPSolve              10 1.0 1.1335e+01
>> 1.0 5.38e+11 1.0 5.4e+07 2.0e+04 9.1e+02  4 88 88 82 49 100100100100100
>> 24130606   43326249   11249 4.26e+03 11249 4.26e+03 100
>>
>> On Tue, Jan 25, 2022 at 1:49 PM Mark Adams <mfadams at lbl.gov> wrote:
>>
>>>
>>>> Note that Mark's logs have been switching back and forth between
>>>> -use_gpu_aware_mpi and changing number of ranks -- we won't have that
>>>> information if we do manual timing hacks. This is going to be a routine
>>>> thing we'll need on the mailing list and we need the provenance to go with
>>>> it.
>>>>
>>>
>>> GPU aware MPI crashes sometimes so to be safe, while debugging, I had it
>>> off. It works fine here so it has been on in the last tests.
>>> Here is a comparison.
>>>
>>>
>> <tt.tar>
>>
>>
>>
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