Hi Pravind,<br><br> That's 1Gb of stdout from master process only in in ~ 1hr is that really a lot? Writes are in 16K blocks. I also read about the same using stdio routines. I'll take a look at MPI-I/O<br><br>Colin<br>
<br><div class="gmail_quote">On Fri, Jan 21, 2011 at 2:53 AM, Pavan Balaji <span dir="ltr"><<a href="mailto:balaji@mcs.anl.gov">balaji@mcs.anl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="im"><br>
On 01/20/2011 09:51 AM, Colin Hercus wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
The 1Gb is MPI messages, about the same is written to stdout.<br>
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1GB of stdout might cause the proxy and mpiexec to be busy for a long time moving the data. Shouldn't you be considering MPI-I/O if you are writing such large amounts?<div class="im"><br>
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<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
My PC for compile and (static) link was at 1.2.1 and I was running on a<br>
server with 1.3.1 when I first noticed this. I then upgraded to 1.3.1<br>
but it made no difference.<br>
</blockquote>
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Yes, mpiexec is backward compatible to any version of MPICH2 (or any other derivative of MPICH2). But it's best to always upgrade to the latest version.<div class="im"><br>
<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
When would mpiexec and hydra_pmi_proxy use CPU? is it just related to<br>
stdout?<br>
</blockquote>
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Mostly, only for stdout/stderr/stdin + when one MPI process needs to know the address of another remote MPI process (typically when you send the first message).<div><div></div><div class="h5"><br>
<br>
-- Pavan<br>
<br>
-- <br>
Pavan Balaji<br>
<a href="http://www.mcs.anl.gov/%7Ebalaji" target="_blank">http://www.mcs.anl.gov/~balaji</a><br>
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