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

[Junchao Zhang]

On Tue, Jun 26, 2018 at 8:26 AM, Mark Adams <mfadams at lbl.gov> wrote:

>
>
> On Tue, Jun 26, 2018 at 12:19 AM Junchao Zhang <jczhang at mcs.anl.gov>
> wrote:
>
>> Mark,
>>   Your email reminded me my recent experiments. My PETSc was configured --with-openmp=1.
>> With hypre, my job ran out of time. That was on an Argonne Xeon cluster.
>>
>
> Interesting. I tested on Cori's Haswell nodes and it looked fine. I did
> not time it but seemed OK.
>
>
>>   I repeated the experiments on Cori's Haswell nodes.  --with-openmp=1,
>> "Linear solve converged due to CONVERGED_RTOL iterations 5". But it took
>> very long time (10 mins). Without --with-openmp=1, it took less than 1
>> second.
>>
>
> Humm. I seemed to run OK on Cori's Haswell nodes. Where you running a
> significant sized job? I was test small serial runs.
>

 I ran with 27 processors and each had 30^3 unknowns.

>
>
>>
>> --Junchao Zhang
>>
>> On Fri, 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).
>>>
>>> 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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