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That seemed to fix the issue. Thanks! Bruce From: Zhou, Hui <zhouh@ anl. gov> Date: Thursday, October 3, 2024 at 11: 01 AM To: discuss@ mpich. org <discuss@ mpich. org> Cc: Palmer, Bruce J <Bruce. Palmer@ pnnl. gov> Subject: Re: Maximum</div>
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<p class="MsoNormal"><span style="font-size:11.0pt">That seemed to fix the issue.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Bruce<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Zhou, Hui <zhouh@anl.gov><br>
<b>Date: </b>Thursday, October 3, 2024 at 11:01</span><span style="font-family:"Arial",sans-serif;color:black"> </span><span style="color:black">AM<br>
<b>To: </b>discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>Palmer, Bruce J <Bruce.Palmer@pnnl.gov><br>
<b>Subject: </b>Re: Maximum number of communicators<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hi Bruce,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Try configure mpich using </span><code><span style="font-size:10.0pt;color:black">--with-device=ch4:ofi --enable-extended-context-bits</span></code><span style="color:black">.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hui<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Palmer, Bruce J via discuss <discuss@mpich.org><br>
<b>Sent:</b> Thursday, October 3, 2024 11:44 AM<br>
<b>To:</b> discuss@mpich.org <discuss@mpich.org><br>
<b>Cc:</b> Palmer, Bruce J <Bruce.Palmer@pnnl.gov><br>
<b>Subject:</b> [mpich-discuss] Maximum number of communicators</span> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Hi, I’m looking at using MPI RMA to support sparse data structures in Global Arrays. I’ve got an application that uses a large number of sparse arrays and it is
failing when the number of sparse arrays reaches about 500. Each sparse array is<o:p></o:p></span></p>
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<p class="xmsonormal">Hi,<o:p></o:p></p>
<p class="xmsonormal"> <o:p></o:p></p>
<p class="xmsonormal">I’m looking at using MPI RMA to support sparse data structures in Global Arrays. I’ve got an application that uses a large number of sparse arrays and it is failing when the number of sparse arrays reaches about 500. Each sparse array
is built on top of 4 conventional global arrays and each global array uses one MPI Window. Each Window appears to be creating its own communicator and I’m hitting an internal limit at 2048 communicators. Is there a way to increase the number of communicators?<o:p></o:p></p>
<p class="xmsonormal"> <o:p></o:p></p>
<p class="xmsonormal">Bruce Palmer<o:p></o:p></p>
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