[petsc-dev] SpMV formats

[Matthew Knepley]

On Mon, Sep 9, 2013 at 6:55 AM, Karl Rupp <rupp at mcs.anl.gov> wrote:

>
>  I liked
>>
>> http://arxiv.org/abs/1307.6209
>>
>> which seems to show that modified ELLPACK can be good for
>> multicore as well as manycore. The sad part of course is that no
>> mention of parallel is made.
>>
>
> I still have to go over it in detail, yet the performance numbers they get
> look reasonable. This was also confirmed by some folks I met in Lausanne
> two weeks back. The only drawback is that their kernels use all these
> low-level intrinsics, which is a pain when it comes to portable code and
> productivity.
>

My understanding was that only the Phi kernels required intrinsics, yet
another reason never to run on the Phi.

   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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