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Subject: Re: [OMPI users] Open MPI performance on Amazon Cloud
From: Hammad Siddiqi (hammad.siddiqi_at_[hidden])
Date: 2010-03-12 03:10:09


Dear All,
Is this the correct forum for sending these kind of emails. please let me
know if there is some other mailing list.
Thank
Best Regards,
Hammad Siddiqi
System Administrator,
Centre for High Performance Scientific Computing,
School of Electrical Engineering and Computer Science,
National University of Sciences and Technology,
H-12, Islamabad.
Office : +92 (51) 90852207
Web: http://hpc.seecs.nust.edu.pk/~hammad/

On Sat, Feb 27, 2010 at 10:07 PM, Hammad Siddiqi <
hammad.siddiqi_at_[hidden]> wrote:

> Dear All,
>
> I am facing very wierd results of OpenMPI 1.4.1 on Amazon EC2. I have
> used Small Instance and and High CPU medium instance for benchmarking
> latency and bandwidth. The OpenMPI was configured with the default
> options. when the code is run in the cluster mode the latency and
> bandwidth of Amazon EC2 Small instance is really less than that of
> Amazon EC2 High CPU medium instance. To my understanding the
> difference should not be that much. The following are the links to
> graphs ad their data:
>
> Data:
> http://hpc.seecs.nust.edu.pk/~hammad/OpenMPI,Latency-BandwidthData.jpg>
> Graphs:
http://hpc.seecs.nust.edu.pk/~hammad/OpenMPI,Latency-Bandwidth.jpg>
>
>
> Please have a look on them.
>
> Is anyone else facing the same problem. Any guidance in this regard
> will highly be appreciated.
>
> Thank you.
>
>
> --
> Best Regards,
> Hammad Siddiqi
> System Administrator,
> Centre for High Performance Scientific Computing,
> School of Electrical Engineering and Computer Science,
> National University of Sciences and Technology,
> H-12, Islamabad.
> Office : +92 (51) 90852207
>