[petsc-users] Hypre runtime switch CPU/GPU

[Stefano Zampini]

We have discussed full runtime switch in HYPRE with Ruipeng few weeks ago,
I'm not sure what's the status. cc'ing him

Il giorno gio 7 ott 2021 alle ore 14:10 Mark Adams <mfadams at lbl.gov> ha
scritto:

> I'm not sure, but I suspect that Hypre does not support runtime switching
> and our model is that you can switch at runtime. This leads to an
> inconsistency.
>
> If we remove -mat_type hypre then your issue would go away but 1) we would
> have to add it back if hypre supports runtime switching in the future, and
> break everyone's input decks, and 2) it would be inconsistent with the
> PETSc model.
>
> I could see throwing an error if you do not use -mat_type hypre and are
> configured for GPUs.
>
> Mark
>
> On Wed, Oct 6, 2021 at 3:31 PM Milan Pelletier via petsc-users <
> petsc-users at mcs.anl.gov> wrote:
>
>> Dear PETSc users,
>>
>> Is there a way to switch a runtime setting for PETSc+Hypre to run on CPU,
>> even when it has been compiled to allow for GPU support?
>> I looks like setting the matrix and vector types to respectively "seqaij"
>> and "seq" results in GPU computation when Hypre is used as a
>> preconditioner. I thought GPU would be used only when mat_type is set to
>> "hypre", following the examples provided with the last release.
>>
>> Thanks for the help,
>> Best regards,
>>
>> Milan
>>
>>

-- 
Stefano
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