[petsc-dev] PETSc programming model for multi-core systems

[Lisandro Dalcin]

On 12 November 2010 11:09, Jed Brown <jed at 59a2.org> wrote:
> On Fri, Nov 12, 2010 at 15:04, Jed Brown <jed at 59a2.org> wrote:
>>
>> The comparison we are more interested is with an equivalent number of MPI
>> processes per node.
>
> Whoops, missed your second attachment.  Indeed, that is what I expect,
> especially at relatively low node counts.  I think it has been fairly well
> demonstrated that straight MPI does alright for weak scaling with decent
> sized subdomains.  The trouble, and the place that threading (OpenMP or
> otherwise) offers an advantage, is for the very small subdomains you end up
> with when strong scaling.

Jed, Rodrigo's results are strong scaling. Unfortunately, we just had
4 cores I7 and 8 cores Xeon per node to test.


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Lisandro Dalcin
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