[petsc-dev] A more positive thread

[Matthew Knepley]

On Fri, Feb 10, 2012 at 10:11 AM, Paul Mullowney <paulm at txcorp.com> wrote:

> Congrats! Given that I have a DoE phase II to continue Petsc GPU
> development, we should probably all get on the same page.
>
> If you're looking to do multi-GPU computing, I've already effectively
> redesigned the MatMult to get very good strong scaling and some excellent
> performance.
> I have some matrices getting 40+ GFlops on 4 GPUs. 20 GFlops on 2 GPUs, ...


Great. Can you check in a benchmark code to src/benchmarks so that I can
run it and reproduce these results? It would
be great to start this sort of thing to make papers easier. I can help with
any problems doing that.

I will look over the code so I get a better idea what is happening.

  Thanks,

     Matt


>
> -Paul
>
>
>  Pramod (who did the work) was my student at EPCC last year. We looked at
>> porting Fluidity (or bits of it) to GPU and as a result decided that
>> working on PETSc's GPU support was going to be the most promising angle for
>> the time we had available. We have never got round to benchmarking Fluidity
>> with Pramod's extended sparse matrix format support, but it shouldn't be
>> too much effort.
>>
>> If you have any questions about it all, feel free to ask.
>>
>> cheers,
>> Michele
>> On 10 Feb 2012, at 15:57, Matthew Knepley wrote:
>>
>>  Has anyone taken a look at this:
>>>
>>>   http://www.epcc.ed.ac.uk/wp-**content/uploads/2011/11/**
>>> PramodKumbhar.pdf<http://www.epcc.ed.ac.uk/wp-content/uploads/2011/11/PramodKumbhar.pdf>
>>>
>>> It is the Fluidity people I think. I have just gotten an NSF award with
>>> Dan Negrut
>>> in Wisconsin and Ahmed Sameh at Purdue to port Ahmed's SPIKE
>>> preconditioner
>>> (you may have heard Olaf Schenk talk about this) to PETSc, and in
>>> particular to
>>> PETSc's GPU backend so that Dan can run it on his GPU cluster. Thus, we
>>> will
>>> be seriously stressing this feature in the near future.
>>>
>>>     Matt
>>>
>>> --
>>> 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
>>>
>>
>


-- 
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
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