<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi Bruce,</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Try configure mpich using <code>--with-device=ch4:ofi --enable-extended-context-bits</code>.</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hui</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> 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</font>
<div> </div>
</div>
<div>
<div style="display:none!important; display:none; visibility:hidden; font-size:1px; color:#ffffff; line-height:1px; height:0px; max-height:0px; opacity:0; overflow:hidden">
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</div>
<div style="display:none!important; display:none; visibility:hidden; font-size:1px; color:#ffffff; line-height:1px; height:0px; max-height:0px; opacity:0; overflow:hidden">
ZjQcmQRYFpfptBannerStart</div>
<div dir="ltr" id="x_pfptBannerbjq8f04" style="display:block!important; text-align:left!important; margin:16px 0px 16px 0px!important; padding:8px 16px 8px 16px!important; border-radius:4px!important; min-width:200px!important; background-color:#D0D8DC!important; background-color:#D0D8DC; border-top:4px solid #90a4ae!important; border-top:4px solid #90a4ae">
<div id="x_pfptBannerbjq8f04" style="float:left!important; display:block!important; margin:0px 0px 1px 0px!important; max-width:600px!important">
<div id="x_pfptBannerbjq8f04" style="display:block!important; visibility:visible!important; background-color:#D0D8DC!important; color:#000000!important; color:#000000; font-family:'Arial',sans-serif!important; font-family:'Arial',sans-serif; font-weight:bold!important; font-weight:bold; font-size:14px!important; line-height:18px!important; line-height:18px">
This Message Is From an External Sender </div>
<div id="x_pfptBannerbjq8f04" style="display:block!important; visibility:visible!important; background-color:#D0D8DC!important; color:#000000!important; color:#000000; font-weight:normal; font-family:'Arial',sans-serif!important; font-family:'Arial',sans-serif; font-size:12px!important; line-height:18px!important; line-height:18px; margin-top:2px!important">
This message came from outside your organization. </div>
</div>
<div style="clear:both!important; display:block!important; visibility:hidden!important; line-height:0!important; font-size:0.01px!important; height:0px">
</div>
</div>
<div style="display:none!important; display:none; visibility:hidden; font-size:1px; color:#ffffff; line-height:1px; height:0px; max-height:0px; opacity:0; overflow:hidden">
ZjQcmQRYFpfptBannerEnd</div>
<style>
<!--
#x_pfptBannerbjq8f04
{display:block!important;
visibility:visible!important;
opacity:1!important;
background-color:#D0D8DC!important;
max-width:none!important;
max-height:none!important}
-->
</style>
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style>
<!--
@font-face
{font-family:"Cambria Math"}
@font-face
{font-family:Aptos}
p.x_MsoNormal, li.x_MsoNormal, div.x_MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Aptos",sans-serif}
span.x_EmailStyle17
{font-family:"Aptos",sans-serif;
color:windowtext}
.x_MsoChpDefault
{font-size:11.0pt}
@page WordSection1
{margin:1.0in 1.0in 1.0in 1.0in}
div.x_WordSection1
{}
-->
</style>
<div class="x_WordSection1">
<p class="x_MsoNormal">Hi,</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">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?</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Bruce Palmer</p>
</div>
</div>
</body>
</html>