On 6/27/07, Maureen O Flynn <maureen.oflynn_at_[hidden]> wrote:
>
> Is this correct? I am not sure it works as my performance figures
> dont indicate any change so perhaps they are not being resized at
> all. Any suggestions regarding how to do this would be great.
To be sure if it works or not, use some really network intensive MPI job
such as GMX Alltoall
http://www.gromacs.org/component/option,com_docman/task,doc_download/gid,67/
Its a ping pong test which sends msgs of different sizes to all nodes in the
cluster and generates some high traffic.. varying the packet sizes and
testing would help check if the buffer size is really affected. may be you
ran a processor intensive task, and that might be the reason why you didnt
find much difference. Or may be check if in the program that you run, the
push bit(PSH) is enabled.. In that case even if you make your buffer large,
every packet would be sent off immediately, and you cant see the effect..
--
N. Rajagopal,
Visit me at http://users.kaski-net.net/~raj/
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