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<div class="moz-cite-prefix">On 06/27/2014 11:04 AM, Matthieu Dorier
wrote:<br>
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<div>Hi Darshan users/dev</div>
<div><br>
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<div>I would like some precisions about the first graph in the
darshan pdf summary (see attached for example).
</div>
<div>There are two bars, one for POSIX and one for MPI-I/O. So
if I understand correctly, MPI-I/O calls in the POSIX bar will
appear in purple (label "other"), and so will the POSIX
operations in the MPI-I/O bar, correct?</div>
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Hi Matthieu,<br>
<br>
Not exactly. An example might be the best way to clarify. Imagine
a job that runs for 100 seconds. It does an MPI_File_Write for 50
seconds, and that MPI_File_write internally calls a POSIX write for
25 seconds. The MPI graph will be 50% green and 50% purple. The
POSIX graph will be 25% green and 75% purple.<br>
<br>
Since the POSIX operation was generated as a step within the MPI-IO
operation, it will count towards the MPI-IO write time in the MPI-IO
graph.<br>
<br>
If you wanted to find out how much time was spent by MPI-IO *not*
including the POSIX operations, then you will have to subtract that
out manually. We don't have a graph showing that.<br>
<br>
thanks,<br>
-Phil<br>
<br>
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<div>Thanks,</div>
<div><br>
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<div><span name="x"></span><span size="2"
data-mce-style="font-size: small;" style="font-size: small;"><span
size="3" data-mce-style="font-size: medium;"
style="font-size: medium;">Matthieu Dorier<br>
</span>PhD student at ENS Rennes<br>
<a moz-do-not-send="true"
href="http://people.irisa.fr/Matthieu.Dorier">http://people.irisa.fr/Matthieu.Dorier</a></span></div>
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