MPI defines rank numbers to be consecutive from 0 to size-1. Your suggested numbering will not work.

-Joachim

From: Niyaz Murshed via discuss <discuss@mpich.org>
Sent: Monday, July 1, 2024 9:09:41 PM
To: discuss@mpich.org <discuss@mpich.org>
Cc: Niyaz Murshed <Niyaz.Murshed@arm.com>; nd <nd@arm.com>
Subject: [mpich-discuss] Custom rank for processes

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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.