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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Dear Antonio,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Thank you for your fast answering.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Do you know how to disable this “active polling” ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Greetings,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Philip<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
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<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"> discuss-bounces@mpich.org
[mailto:discuss-bounces@mpich.org] <b>Im Auftrag von </b>"Antonio J. Peņa"<br>
<b>Gesendet:</b> Dienstag, 1. Juli 2014 16:30<br>
<b>An:</b> discuss@mpich.org<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 lang="EN-US" style="mso-fareast-language:DE"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"><img width="647" height="497" id="Grafik_x0020_1" src="cid:image001.jpg@01CF95D3.3B30B680"></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>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>discuss mailing list <a href="mailto:discuss@mpich.org">discuss@mpich.org</a><o:p></o:p></pre>
<pre>To manage subscription options or unsubscribe:<o:p></o:p></pre>
<pre><a href="https://lists.mpich.org/mailman/listinfo/discuss">https://lists.mpich.org/mailman/listinfo/discuss</a><o:p></o:p></pre>
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<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>
<pre>-- <o:p></o:p></pre>
<pre>Antonio J. Peņa<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 href="mailto:apenya@mcs.anl.gov">apenya@mcs.anl.gov</a><o:p></o:p></pre>
<pre><a href="http://www.mcs.anl.gov/~apenya">www.mcs.anl.gov/~apenya</a><o:p></o:p></pre>
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