[petsc-dev] Current status: GPUs for PETSc

[Matthew Knepley]

On Sun, Nov 4, 2012 at 10:04 PM, Karl Rupp <rupp at mcs.anl.gov> wrote:

>
>      The copy_to_cpu-part could be managed via page-locked memory, yet I
>>     still have to investigate its robustness. It is certainly a nice
>>     option for APUs, because it has zero overhead. The only drawback is
>>     that APUs just lack performance in general...
>>
>>     Overall, I don't want to give away the robustness you described
>>     above. There will always be some operations that work better on the
>>     CPU, while others work better on accelerators, so hopping between
>>     them is (unfortunately) rather the rule than the exception in real
>>     world applications.
>>
>>
>> Okay, then I have a procedural question. Should we write about this for
>> the GPU book, or just describe the
>> current state of affairs?
>>
>
> Considering that I wanted to contact you anyway with respect to help on
> the write-up for the book: Can we postpone this decision to around November
> 20th? I guess I will have have a much clearer picture on the topic then.
>

Yes, I think we can writeup the old stuff in time for mid-Jan, so waiting
does no harm.

    Matt


> Best regards,
> Karli
>



-- 
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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