[petsc-dev] A closer look at the Xeon Phi

[Jed Brown]

On Tue, Feb 12, 2013 at 7:09 PM, Karl Rupp <rupp at mcs.anl.gov> wrote:

> Which crossover are you referring to? The CPU versus GTX285 at about 20k
>> dofs, but with only very small gains for another order of magnitude?
>>
>
> I assume it's the cross-over of Xeon Phi vs. Xeon,


MIC is slower than Xeon by more than an order of magnitude at 10k dofs.


> but almost all cross-overs happen in the 10k-100k region and are due to
> PCI-Express latency.


Why is PCI-Express latency important here? Can't the MIC code run entirely
on the device?


> Scaling this to large clusters, replace Xeon Phi by compute node,
> PCI-Express by GB-Ethernet/Infiniband as well as change the timescale a bit
> and you're probably not too far off...
>
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