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>, discuss@mpich.org <discuss@mpich.org>
Cc: Niyaz Murshed <Niyaz.Murshed@arm.com>, nd <nd@arm.com>
Subject: Re: [mpich-discuss] Custom rank for processes

What is the rankmap used for ? From: Jenke, Joachim <jenke@ itc. rwth-aachen. de> Sent: Monday, July 1, 2024 2: 21: 53 PM To: discuss@ mpich. org <discuss@ mpich. org> Cc: Niyaz Murshed <Niyaz. Murshed@ arm. com>; nd <nd@ arm. com>

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What is the rankmap used for ?

From: Jenke, Joachim <jenke@itc.rwth-aachen.de>
Sent: Monday, July 1, 2024 2:21:53 PM
To: discuss@mpich.org <discuss@mpich.org>
Cc: Niyaz Murshed <Niyaz.Murshed@arm.com>; nd <nd@arm.com>
Subject: Re: Custom rank for processes

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

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.