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

[Smith, Barry F.]

> On Jun 22, 2018, at 3:33 PM, Mark Adams <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?

   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
>