[petsc-dev] problem with hypre with '--with-openmp=1'

[Yang, Ulrike Meier]

Hi Mark,
I don’t have an account on KNL and have not tested hypre there with OpenMP. I believe other people have used it however, but I haven’t heard about any non-convergence issues before now.
Ulrike

From: Mark Adams <mfadams at lbl.gov>
Sent: Friday, June 22, 2018 4:28 PM
To: Smith, Barry F. <bsmith at mcs.anl.gov>
Cc: For users of the development version of PETSc <petsc-dev at mcs.anl.gov>; Yang, Ulrike Meier <yang11 at llnl.gov>; treb at lbl.gov Trebotich <treb at lbl.gov>
Subject: Re: [petsc-dev] problem with hypre with '--with-openmp=1'


On Fri, Jun 22, 2018 at 4:39 PM Smith, Barry F. <bsmith at mcs.anl.gov<mailto:bsmith at mcs.anl.gov>> wrote:


> On Jun 22, 2018, at 3:33 PM, Mark Adams <mfadams at lbl.gov<mailto:mfadams at lbl.gov>> wrote:
>
> We are using KNL (Cori) and hypre is not working when configured with  '--with-openmp=1', even when not using threads (as far as I can tell, I never use threads).

   It does seem to run correctly without the --with-openmp option?

Yes. And I've run it through valgrind.

Ulrike: have you tested on KNL with openMP?


   PETSc code does not know about --with-openmp at all so my guess is some bug in the compiler when building hypre with OpenMP.

   Barry

>
> Hypre is not converging, for instance with an optimized build:
>
> srun -n 1 ./ex56 -pc_type hypre -ksp_monitor -ksp_converged_reason -ksp_type cg -pc_hypre_type boomeramg
> OMP: Warning #239: KMP_AFFINITY: granularity=fine will be used.
>   0 KSP Residual norm 7.366251922394e+22
>   1 KSP Residual norm 3.676434682799e+22
> Linear solve did not converge due to DIVERGED_INDEFINITE_PC iterations 2
>
> Interestingly in debug mode it almost looks good but it is dying:
>
> 05:09 nid02516 maint *= ~/petsc_install/petsc/src/ksp/ksp/examples/tutorials$ make PETSC_DIR=/global/homes/m/madams/petsc_install/petsc-cori-knl-dbg64-intel-omp PETSC_ARCH="" run
> srun -n 1 ./ex56 -pc_type hypre -ksp_monitor -ksp_converged_reason -ksp_type cg -pc_hypre_type boomeramg
> OMP: Warning #239: KMP_AFFINITY: granularity=fine will be used.
>   0 KSP Residual norm 7.882081712007e+02
>   1 KSP Residual norm 2.500214073037e+02
>   2 KSP Residual norm 3.371746347713e+01
>   3 KSP Residual norm 2.918759396143e+00
>   4 KSP Residual norm 9.006505495017e-01
> Linear solve did not converge due to DIVERGED_INDEFINITE_PC iterations 5
>
> This test runs fine on Xeon nodes. I assume that Hypre has been tested on KNL. GAMG runs fine, of coarse and the initial residual is similar to this debug run.
>
> Could PETSc be messing up the matrix conversion to hypre '--with-openmp=1' ?
>
> Any ideas?
>
> Thanks,
> Mark
>
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