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Dear Philip,<br>
<br>
Both functions are part of MPICH. MPICH uses intentionally active
polling to minimize the latency on communications. In short, you
get faster communications by repeatedly checking for communication
completion during waiting times. So, that's expected.<br>
<br>
Antonio<br>
<br>
<br>
On 07/01/2014 09:16 AM, Klaus Philip wrote:<br>
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<p class="MsoNormal"><span lang="EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I tested mpich2 3.1.1
with the Intel MPI Benchmark, more precisely the
“PingPong”-Benchmark.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">It uses the MPI_Send and
MPI_Recv function to send one message from
<i>Process 1</i> to <i>Process 2</i> and back.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">While the benchmark was
running, I executed the Sysprofiler (sysprof) to check the
time distribution (Picture below).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">My question is now, if
the two marked Processes (<b>MPID_nem_lmt_shm_progress</b>
and
<b>poll</b>) are parts of MPICH or the
Intel-PingPong-Benchmark, because they are both consuming
much time (49,03% and 19,99%).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"><img
id="Grafik_x0020_1"
src="cid:part1.02000606.06040301@mcs.anl.gov" height="497"
width="647"></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Greetings,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Philip<o:p></o:p></span></p>
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<pre class="moz-signature" cols="72">--
Antonio J. Peña
Postdoctoral Appointee
Mathematics and Computer Science Division
Argonne National Laboratory
9700 South Cass Avenue, Bldg. 240, Of. 3148
Argonne, IL 60439-4847
<a class="moz-txt-link-abbreviated" href="mailto:apenya@mcs.anl.gov">apenya@mcs.anl.gov</a>
<a class="moz-txt-link-abbreviated" href="http://www.mcs.anl.gov/~apenya">www.mcs.anl.gov/~apenya</a></pre>
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