[mpich-discuss] Custom rank for processes

[Jenke, Joachim]

MPI defines rank numbers to be consecutive from 0 to size-1. Your suggested numbering will not work.
-Joachim
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From: Niyaz Murshed via discuss <discuss at mpich.org>
Sent: Monday, July 1, 2024 9:09:41 PM
To: discuss at mpich.org <discuss at mpich.org>
Cc: Niyaz Murshed <Niyaz.Murshed at arm.com>; nd <nd at arm.com>
Subject: [mpich-discuss] Custom rank for processes

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
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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 20,30



Thanks.
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