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Subject: Re: [OMPI devel] Any plans to support Intel MIC (Xeon Phi) in Open-MPI?
From: Ralph Castain (rhc_at_[hidden])
Date: 2013-05-02 20:47:45

On May 2, 2013, at 5:12 PM, Christopher Samuel <samuel_at_[hidden]> wrote:

> Hash: SHA1
> Hi folks,
> The new system we're bringing up has 10 nodes with dual Xeon Phi MIC
> cards, are there any plans to support them by launching MPI tasks
> directly on the Phis themselves (rather than just as offload devices
> for code on the hosts)?

We had something similar at one time - I developed it for the Roadrunner cluster so you could run MPI tasks on the GPUs. Worked well, but eventually fell into disrepair due to lack of use.

In this case, I suspect it will be much easier to do as the Phis appear to be a lot more visible to the host than the GPU did on RR. Looking at the documentation, the Phis just sit directly on the PCIe bus, so they should look just like any other processor, and they are Xeon binary compatible - so there is no issue with tracking which binary to run on which processor.

Brice: do the Phis appear in the hwloc topology object?

Chris: can you run lstopo on one of the nodes and send me the output (off-list)?

> All the best,
> Chris
> - --
> Christopher Samuel Senior Systems Administrator
> VLSCI - Victorian Life Sciences Computation Initiative
> Email: samuel_at_[hidden] Phone: +61 (0)3 903 55545
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