<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    <div class="moz-cite-prefix"><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:<br>
    </div>
    <blockquote
cite="mid:4E38DC3B9800054BACC34A9F64E4BC181D297F44@S0MSMAIL111.arc.local"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=ISO-8859-1">
      <meta name="Generator" content="Microsoft Word 14 (filtered
        medium)">
      <!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]-->
      <style><!--
/* Font Definitions */
@font-face
        {font-family:Calibri;
        panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
        {font-family:Tahoma;
        panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
        {margin:0cm;
        margin-bottom:.0001pt;
        font-size:11.0pt;
        font-family:"Calibri","sans-serif";
        mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
        {mso-style-priority:99;
        color:blue;
        text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
        {mso-style-priority:99;
        color:purple;
        text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
        {mso-style-priority:99;
        mso-style-link:"Sprechblasentext Zchn";
        margin:0cm;
        margin-bottom:.0001pt;
        font-size:8.0pt;
        font-family:"Tahoma","sans-serif";
        mso-fareast-language:EN-US;}
span.E-MailFormatvorlage17
        {mso-style-type:personal-compose;
        font-family:"Calibri","sans-serif";
        color:windowtext;}
span.SprechblasentextZchn
        {mso-style-name:"Sprechblasentext Zchn";
        mso-style-priority:99;
        mso-style-link:Sprechblasentext;
        font-family:"Tahoma","sans-serif";}
.MsoChpDefault
        {mso-style-type:export-only;
        font-family:"Calibri","sans-serif";
        mso-fareast-language:EN-US;}
@page WordSection1
        {size:612.0pt 792.0pt;
        margin:70.85pt 70.85pt 2.0cm 70.85pt;}
div.WordSection1
        {page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
      <div class="WordSection1">
        <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>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
discuss mailing list     <a class="moz-txt-link-abbreviated" href="mailto:discuss@mpich.org">discuss@mpich.org</a>
To manage subscription options or unsubscribe:
<a class="moz-txt-link-freetext" href="https://lists.mpich.org/mailman/listinfo/discuss">https://lists.mpich.org/mailman/listinfo/discuss</a></pre>
    </blockquote>
    <br>
    <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>
  </body>
</html>