[petsc-dev] PETSc GPU example

[Fande Kong]

Thanks, Matt,

Sorry, I still have more questions on this example. How to refine mesh to
make the problem larger?

I tried the following options, and none of them worked. I might do
something wrong.

-ex56_dm_refine 9

and

-dm_refine 4

Thanks,

Fande

On Mon, Dec 6, 2021 at 5:04 PM Matthew Knepley <knepley at gmail.com> wrote:

> On Mon, Dec 6, 2021 at 7:02 PM Fande Kong <fdkong.jd at gmail.com> wrote:
>
>> Thanks, Matt
>>
>> On Mon, Dec 6, 2021 at 4:47 PM Matthew Knepley <knepley at gmail.com> wrote:
>>
>>> On Mon, Dec 6, 2021 at 6:40 PM Fande Kong <fdkong.jd at gmail.com> wrote:
>>>
>>>> Dear PETSc team,
>>>>
>>>> I am interested in a careful evaluation of PETSc GPU performance in our
>>>> INL cluster.
>>>>
>>>> Any example in PETSc that can show GPU speedup with solving a nonlinear
>>>> equation?
>>>>
>>>> I talked to Junchao; he suggested that I try SNES/tutorial/ex56. I
>>>> tried that, but I could not find any speedup using the GPU. I could attach
>>>> some results of "log_view" later if we would like to see that.
>>>>
>>>
>>> We should note that you will only see speedup in the solver, so that
>>> problem has to be pretty large. I believe Mark has good results with it.
>>> The assembly is still all on the CPU. I am working on this over break,
>>> and hope to have a CEED version of it by the new year.
>>>
>>
>> Are both function and matrix assmelies on CPU? Or just the matrix
>> assembly?
>>
>
> There is no GPU assembly right now.
>
>   Matt
>
>
>> OK, I will try to check the solver part
>>
>> Thanks, again
>>
>> Fande
>>
>>
>>
>>>
>>>   Thanks,
>>>
>>>      Matt
>>>
>>>
>>>> Appreciate any instructions/comments about running a simple PETSc GPU
>>>> example to get a speedup.
>>>>
>>>> Thanks,
>>>>
>>>> Fande
>>>>
>>>
>>>
>>> --
>>> 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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