[petsc-users] Requesting multi-GPUs

[Matthew Knepley]

On Thu, Sep 13, 2018 at 2:33 PM Manuel Valera <mvalera-w at sdsu.edu> wrote:

> So, from what i get here the round robin assignation to each GPU device is
> done automatically by PETSc, from mapping the system? or do i have to pass
> a command line argument to do that?
>

It is automatic.

  Thanks,

    Matt


> Thanks,
>
>
> On Wed, Sep 12, 2018 at 2:38 PM, Matthew Knepley <knepley at gmail.com>
> wrote:
>
>> 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/>
>>
>
>

-- 
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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