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Subject: Re: [OMPI users] Some Questions on Building OMPI on Linux Em64t
From: Michael E. Thomadakis (miket7777_at_[hidden])
Date: 2010-05-21 15:24:36


Hello,

I am resending this because I am not sure if it was sent out to the OMPI
list.

Any help would be greatly appreciated.

best ....

Michael

On 05/19/10 13:19, Michael E. Thomadakis wrote:
> Hello,
> I would like to build OMPI V1.4.2 and make it available to our users at the
> Supercomputing Center at Texas A&M Univ. Our system is a 2-socket, 4-core Nehalem
> @2.8GHz, 24GiB DRAM / node, 324 nodes connected to 4xQDR Voltaire fabric,
> CentOS/RHEL 5.4.
>
>
>
> I have been trying to find the following information :
>
> 1) high-resolution timers: how do I specify the HRT linux timers in the
> --with-timer=TYPE
> line of ./configure ?
>
> 2) I have installed blcr V0.8.2 but when I try to built OMPI and I point to the
> full installation it complains it cannot find it. Note that I build BLCR with
> GCC but I am building OMPI with Intel compilers (V11.1)
>
>
> 3) Does OMPI by default use SHM for intra-node message IPC but reverts to IB for
> inter-node ?
>
> 4) How could I select the high-speed transport, say DAPL or OFED IB verbs ? Is
> there any preference as to the specific high-speed transport over Mellanox/Voltaire QDR IB?
>
> 5) When we launch MPI jobs via PBS/TORQUE do we have control on the task and
> thread placement on nodes/cores ?
>
> 6) Can we suspend/restart cleanly OMPI jobs with the above scheduler ? Any
> caveats on suspension / resumption of OMPI jobs ?
>
> 7) Do you have any performance data comparing OMPI vs say MVAPICHv2 and
> IntelMPI ? This is not a political issue since I am groing to be providing all
> these MPI stacks to our users (IntelMPI V4.0 already installed).
>
>
>
>
> Thank you so much for the great s/w ...
>
> best
> Michael
>
>
>
> % -------------------------------------------------------------------- \
> % Michael E. Thomadakis, Ph.D. Senior Lead Supercomputer Engineer/Res \
> % E-mail: miket AT tamu DOT edu Texas A&M University \
> % web:http://alphamike.tamu.edu Supercomputing Center \
> % Voice: 979-862-3931 Teague Research Center, 104B \
> % FAX: 979-847-8643 College Station, TX 77843, USA \
> % -------------------------------------------------------------------- \
>