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

[Mark Adams]

Interesting, I am seeing the same thing with ksp/ex56 (elasticity) with
30^3 grid on each process. One process runs fine (1.5 sec) but 8 processes
with 30^3 on each process took 156 sec.

And, PETSc's log_view is running extremely slow. I have the total time
(156) but each event is taking like a minute or more to come out.

On Tue, Jun 26, 2018 at 10:13 AM Junchao Zhang <jczhang at mcs.anl.gov> wrote:

>
> 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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