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<p class="MsoNormal">With the default `mpiexec`, which is `mpiexec.hydra`, it sets environment variable `PMI_RANK`, and `PMI_SIZE`. You can check that with<br>
mpiexec -n 1 env |grep PMI_<o:p></o:p></p>
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<p class="MsoNormal">-- <br>
Hui Zhou<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Sajid Ali via discuss <discuss@mpich.org><br>
<b>Date: </b>Monday, January 4, 2021 at 8:13 PM<br>
<b>To: </b>discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>Sajid Ali <sajidsyed2021@u.northwestern.edu><br>
<b>Subject: </b>[mpich-discuss] MPICH equivalent to OMPI_COMM_WORLD_RANK<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hi MPICH-developers, <o:p></o:p></p>
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<p class="MsoNormal">Does MPICH set an environment variable describing the MPI rank equivalent to OpenMPI's `OMPI_COMM_WORLD_RANK` ? If so, what is it called ?<o:p></o:p></p>
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<p class="MsoNormal">Thank You,<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Sajid Ali (he/him) | PhD Candidate<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Applied Physics<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Northwestern University<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><a href="http://s-sajid-ali.github.io" target="_blank">s-sajid-ali.github.io</a><o:p></o:p></span></p>
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