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Unfortunately the default communication channel doesn't have that
capability. You'll have to recompile MPICH configuring with <br>
<pre>
--with-device=ch3:sock</pre>
<br>
<br>
Antonio<br>
<br>
<br>
On 07/02/2014 01:54 AM, Klaus Philip wrote:<br>
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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Dear
Antonio,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Thank
you for your fast answering.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Do
you know how to disable this “active polling” ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Greetings,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Philip<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
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1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:DE">Von:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:DE">
<a class="moz-txt-link-abbreviated" href="mailto:discuss-bounces@mpich.org">discuss-bounces@mpich.org</a>
[<a class="moz-txt-link-freetext" href="mailto:discuss-bounces@mpich.org">mailto:discuss-bounces@mpich.org</a>] <b>Im Auftrag von </b>"Antonio
J. Peña"<br>
<b>Gesendet:</b> Dienstag, 1. Juli 2014 16:30<br>
<b>An:</b> <a class="moz-txt-link-abbreviated" href="mailto:discuss@mpich.org">discuss@mpich.org</a><br>
<b>Betreff:</b> Re: [mpich-discuss] Time distribution of
Intel MPI Benchmark (PingPong)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><br>
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:<o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US">Hi,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I tested mpich2 3.1.1
with the Intel MPI Benchmark, more precisely the
“PingPong”-Benchmark.</span><o:p></o:p></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.</span><o:p></o:p></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).</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></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%).</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"><img
id="Grafik_x0020_1"
src="cid:part1.02080704.08050004@mcs.anl.gov"
height="497" width="647"></span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Greetings,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Philip</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";mso-fareast-language:DE"><br>
<br>
<br>
<o:p></o:p></span></p>
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<br>
<br>
<o:p></o:p></span></p>
<pre>-- <o:p></o:p></pre>
<pre>Antonio J. Peña<o:p></o:p></pre>
<pre>Postdoctoral Appointee<o:p></o:p></pre>
<pre>Mathematics and Computer Science Division<o:p></o:p></pre>
<pre>Argonne National Laboratory<o:p></o:p></pre>
<pre>9700 South Cass Avenue, Bldg. 240, Of. 3148<o:p></o:p></pre>
<pre>Argonne, IL 60439-4847<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:apenya@mcs.anl.gov">apenya@mcs.anl.gov</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://www.mcs.anl.gov/%7Eapenya">www.mcs.anl.gov/~apenya</a><o:p></o:p></pre>
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<br>
<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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