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Subject: Re: [OMPI users] OpenMPI with Gemini Interconnect
From: Ralph Castain (rhc_at_[hidden])
Date: 2014-04-16 17:59:20


The Java bindings are written on top of the C bindings, so you'll be able
to use those networks just fine from Java :-)

On Wed, Apr 16, 2014 at 2:27 PM, Saliya Ekanayake <esaliya_at_[hidden]> wrote:

> Thank you Nathan, this is what I was looking for. I'll try to build
> OpenMPI 1.8 and get back to this thread if I run into issues.
>
> Saliya
>
>
> On Wed, Apr 16, 2014 at 5:19 PM, Nathan Hjelm <hjelmn_at_[hidden]> wrote:
>
>> You do not need CCM to use Open MPI on with Gemini and Aries. Open MPI
>> has natively supported both networks since 1.7.0. Please take a look at
>> the platform files in contrib/platform/lanl/cray_xe6 for CLE 4.1
>> support. You should be able to just build using:
>>
>> configure --with-platform=contrib/platform/lanl/cray_xe6/optimized-lustre
>>
>> If you also enable the Java interfaces you should be up and running with
>> Gemini. Keep in mind you can use either mpirun or aprun to launch. You
>> will get a warning message from PMI (there is an open bug on this) when
>> using mpirun but it is harmless.
>>
>> If you want more info on the XE, XK, and XC support feel free to ask on
>> this list and I will try to get an answer back quickly.
>>
>> -Nathan Hjelm
>> HPC-5, LANL
>>
>>
>> On Wed, Apr 16, 2014 at 05:01:37PM -0400, Ray Sheppard 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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>> > users_at_[hidden]
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>>
>> > _______________________________________________
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>>
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>
>
>
> --
> Saliya Ekanayake esaliya_at_[hidden]
> Cell 812-391-4914 Home 812-961-6383
> http://saliya.org
>
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