[petsc-users] Requesting multi-GPUs

[Manuel Valera]

Ok then, how can i try getting more than one GPU with the same number of
MPI processes?

Thanks,

On Wed, Sep 12, 2018 at 2:20 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Wed, Sep 12, 2018 at 5:13 PM Manuel Valera <mvalera-w at sdsu.edu> wrote:
>
>> Hello guys,
>>
>> I am working in a multi-gpu cluster and i want to request 2 or more GPUs,
>> how can i do that from PETSc? evidently mpirun -n # is for requesting
>> processors, but what if i want to use one mpi processor but several GPUs
>> instead?
>>
>
> We do not do that. You would run the same number of MPI processes as GPUs.
> Note that
> you can have more than 1 MPI process on a processor.
>
>   Matt
>
>
>> Also, i understand the GPU handles the linear system solver, but what
>> about the data management? can i do DMs for other than the linear solver
>> using the GPUs
>> ?
>>
>> Thanks once more,
>>
>>
>>
>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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