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>What Joachim points out is that you can set a rank of 2, 3, 20, 30 if your total number of processes is 4.<br>
<br>
Of course, I meant for "can't".<br>
<br>
Here are some additional pointers:<br>
* The PR adding the rankmap option: <a href="https://urldefense.us/v3/__https://github.com/pmodels/mpich/pull/6213__;!!G_uCfscf7eWS!aYjh-lLSNtgHLhNQwJ3-6DMhJFW7_EjsfQQz31L5c3FoOQp-tksDDmeTD_7QuRdQHyzTXI3MbjLR$" id="LPlnk">
https://github.com/pmodels/mpich/pull/6213</a><br>
* Other options for specifying rank ordering and binding:<a href="https://urldefense.us/v3/__https://github.com/pmodels/mpich/blob/main/doc/wiki/how_to/Using_the_Hydra_Process_Manager.md__;!!G_uCfscf7eWS!aYjh-lLSNtgHLhNQwJ3-6DMhJFW7_EjsfQQz31L5c3FoOQp-tksDDmeTD_7QuRdQHyzTXAQULsgE$" id="LPlnk">https://github.com/pmodels/mpich/blob/main/doc/wiki/how_to/Using_the_Hydra_Process_Manager.md</a><br>
<br>
Hui</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Zhou, Hui <zhouh@anl.gov><br>
<b>Sent:</b> Monday, July 1, 2024 3:04 PM<br>
<b>To:</b> discuss@mpich.org <discuss@mpich.org>; Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc:</b> Niyaz Murshed <Niyaz.Murshed@arm.com>; nd <nd@arm.com><br>
<b>Subject:</b> Re: Custom rank for processes</font>
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Hi Niyaz,</div>
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Yes, you can use the <code>-rankmap</code> option to specify a full rank ordering. The syntax for rankmap string is:<br>
<br>
```<br>
/* rankmap string format (used in PMI_process_mapping) in ABNF:</div>
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*</div>
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* mapping = '(' format ',' (block / block_repeats) *[',' (block / block_repeats)] ')'</div>
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* format = 'vector'</div>
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* block = num / '(' num ',' num ',' num ')'</div>
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* block_repeats = '[' block *[',' block] ']x' num</div>
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* num = 1*DIGIT</div>
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*</div>
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* If a block is in 3-tuple of (X,Y,Z), the meaning is:</div>
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* X - node id start value</div>
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* Y - number of nodes with size Z</div>
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* Z - number of processes assigned to each node</div>
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*</div>
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* If a block is a single number id, it denotes the node id, which is equivallen to</div>
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* (id, 1, 1).</div>
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*</div>
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* A block_repeat repeats the bracketed block list by num of times.</div>
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*/<br>
```<br>
<br>
What Joachim points out is that you can set a rank of 2, 3, 20, 30 if your total number of processes is 4. You can only order the processes.<br>
<br>
Hope that helps.</div>
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Hui</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Niyaz Murshed via discuss <discuss@mpich.org><br>
<b>Sent:</b> Monday, July 1, 2024 2:43 PM<br>
<b>To:</b> discuss@mpich.org <discuss@mpich.org>; Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc:</b> Niyaz Murshed <Niyaz.Murshed@arm.com>; nd <nd@arm.com><br>
<b>Subject:</b> Re: [mpich-discuss] Custom rank for processes</font>
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Am actually trying to understand how/if I can pin a rank to a process .. also pin a core to a process. From: Niyaz Murshed via discuss <discuss@ mpich. org> Date: Monday, July 1, 2024 at 2: 34 PM To: Jenke, Joachim <jenke@ itc. rwth-aachen. de>,
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<p class="x_x_MsoNormal"><span style="font-size:11.0pt">Am actually trying to understand how/if I can pin a rank to a process .. also pin a core to a process.</span></p>
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<p class="x_x_MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Niyaz Murshed via discuss <discuss@mpich.org><br>
<b>Date: </b>Monday, July 1, 2024 at 2:34</span><span style="font-family:"Arial",sans-serif; color:black"> </span><span style="color:black">PM<br>
<b>To: </b>Jenke, Joachim <jenke@itc.rwth-aachen.de>, discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>Niyaz Murshed <Niyaz.Murshed@arm.com>, nd <nd@arm.com><br>
<b>Subject: </b>Re: [mpich-discuss] Custom rank for processes</span></p>
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<p class="x_x_MsoNormal" style=""><span style="font-size:1.0pt; color:white">What is the rankmap used for ? From: Jenke, Joachim <jenke@</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">itc.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">rwth-aachen.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">de>
Sent: Monday, July 1, 2024 2:</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">21:</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">53
PM To: discuss@</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">mpich.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">org
<discuss@</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">mpich.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">org>
Cc: Niyaz Murshed <Niyaz.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">Murshed@</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">arm.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">com>;
nd <nd@</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">arm.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">com>
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<p class="x_x_MsoNormal">What is the rankmap used for ? </p>
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<p class="x_x_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"> Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Sent:</b> Monday, July 1, 2024 2:21:53 PM<br>
<b>To:</b> discuss@mpich.org <discuss@mpich.org><br>
<b>Cc:</b> Niyaz Murshed <Niyaz.Murshed@arm.com>; nd <nd@arm.com><br>
<b>Subject:</b> Re: Custom rank for processes</span> </p>
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<p class="x_x_MsoNormal">MPI defines rank numbers to be consecutive from 0 to size-1. Your suggested numbering will not work.</p>
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<p class="x_x_MsoNormal">-Joachim </p>
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<p class="x_x_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"> Niyaz Murshed via discuss <discuss@mpich.org><br>
<b>Sent:</b> Monday, July 1, 2024 9:09:41 PM<br>
<b>To:</b> discuss@mpich.org <discuss@mpich.org><br>
<b>Cc:</b> Niyaz Murshed <Niyaz.Murshed@arm.com>; nd <nd@arm.com><br>
<b>Subject:</b> [mpich-discuss] Custom rank for processes</span> </p>
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<p class="x_x_MsoNormal" style=""><span style="font-size:1.0pt; color:white">Hello, Is it possible to provide custom ranks to processes ? I see a param called “-rankmap” .. Does it provide this option? Is it possible to do something like below : Node1 => 2
processes => rank 2,3 Node2 => 2 processes => rank </span></p>
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<p class="x_x_xxmsonormal">Hello, </p>
<p class="x_x_xxmsonormal">Is it possible to provide custom ranks to processes ?</p>
<p class="x_x_xxmsonormal">I see a param called “-rankmap” .. Does it provide this option?</p>
<p class="x_x_xxmsonormal"> </p>
<p class="x_x_xxmsonormal">Is it possible to do something like below :</p>
<p class="x_x_xxmsonormal">Node1 => 2 processes => rank 2,3</p>
<p class="x_x_xxmsonormal">Node2 => 2 processes => rank 20,30</p>
<p class="x_x_xxmsonormal"> </p>
<p class="x_x_xxmsonormal">Thanks.</p>
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