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<p style="margin:0px 0px 1.2em">Hi MPICH-developers, </p>
<p style="margin:0px 0px 1.2em">I’ve been trying to benchmark
mpi software currently available on my univ. cluster with OSU micro benchmarks. I
used this script to build and run the benchmark : <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline"><a href="https://github.com/s-sajid-ali/nu-quest-mpi/blob/master/curr_mpi_bench/submit.sh" target="_blank">https://github.com/s-sajid-ali/nu-quest-mpi/blob/master/curr_mpi_bench/submit.sh</a></code></p>
<p style="margin:0px 0px 1.2em">And here is a plot of the results I obtained :<br><img src="cid:ii_k3dgygab0" alt="curr_mpi.png" class="gmail-CToWUd gmail-a6T" tabindex="0" width="455" height="163"></p><p style="margin:0px 0px 1.2em">Could
someone give me a clue as to why the behaviour of mpich bandwidth vs
latency is so odd ? Why does the bandwidth increase first and then fall
off at high message sizes? </p>
<p style="margin:0px 0px 1.2em">I’m also attaching the
config.log for this particular mpich build which seems to indicate that
MPICH was built with ch3 and nemesis:tcp. Does this mean that it didn’t
pick up the infiniband libraries or that it is somehow using IPoIB? Is
there a way to get this information ?</p>
<p style="margin:0px 0px 1.2em">Thanks in advance for the help! <br><br><br>--<br>Sajid Ali | PhD Candidate<br>Applied Physics<br>Northwestern University<br><a href="http://s-sajid-ali.github.io" target="_blank">s-sajid-ali.github.io</a></p>
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