[petsc-users] Requesting multi-GPUs

[Matthew Knepley]

On Wed, Sep 12, 2018 at 5:31 PM Manuel Valera <mvalera-w at sdsu.edu> wrote:

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

I do not believe we handle more than one GPU per MPI process. Is that what
you are asking?

  Thanks,

    Matt


> 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/>
>>
>
>

-- 
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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