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Subject: Re: [OMPI users] OpenMPI with Gemini Interconnect
From: Saliya Ekanayake (esaliya_at_[hidden])
Date: 2014-04-16 17:12:59


I see. Also, I wanted to build OpenMPI because the provided OpenMPI didn't
have Java binding. It seems at this point the only option is to use TCP in
CCM in BigRed 2 and if I remember correctly Mason and Quarry don't have IB
as well, correct?

Thank you,
Saliya

On Wed, Apr 16, 2014 at 5:01 PM, Ray Sheppard <rsheppar_at_[hidden]> wrote:

> Hello,
> Big Red 2 provides its own MPICH based MPI. The only case where the
> provided OpenMPI module becomes relevant is when you create a CCMLogin
> instance in Cluster Compatibility Mode (CCM). For most practical uses,
> those sorts of needs are better addressed on the Quarry or Mason machines.
> When in CCM, the Gemini network is not directly accessible. The
> proposed idea is for middleware to present an interface resembling an IB
> interface and use it to create a subset of the Gemini network for the CCM
> virtual cluster. Unfortunately, due to a Cray bug, case 80503, that has
> not yet worked.
> Ray
>
>
> On 4/16/2014 4:44 PM, Saliya Ekanayake wrote:
>
> Hi,
>
> We have a Cray XE6/XK7 supercomputer (BigRed II) and I was trying to get
> OpenMPI Java binding working on it. I couldn't find a way to utilize its
> Gemini interconnect, instead was running on TCP, which is inefficient.
>
> I see some work has been done along these lines in [1] and wonder if you
> could give some suggestions on how to build OpenMPI with Gemini support.
>
> [1]
> https://www.open-mpi.org/papers/cug-2012/cug_2012_open_mpi_for_cray_xe_xk.pdf
>
> Thank you,
> Saliya
>
> --
> Saliya Ekanayake esaliya_at_[hidden]
> http://saliya.org
>
>
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-- 
Saliya Ekanayake esaliya_at_[hidden]
Cell 812-391-4914 Home 812-961-6383
http://saliya.org