[mpich-discuss] Maximum number of communicators

[Palmer, Bruce J]

That seemed to fix the issue.
Thanks!
Bruce

From: Zhou, Hui <zhouh at anl.gov>
Date: Thursday, October 3, 2024 at 11:01 AM
To: discuss at mpich.org <discuss at mpich.org>
Cc: Palmer, Bruce J <Bruce.Palmer at pnnl.gov>
Subject: Re: Maximum number of communicators
Hi Bruce,

Try configure mpich using --with-device=ch4:ofi --enable-extended-context-bits.

Hui
________________________________
From: Palmer, Bruce J via discuss <discuss at mpich.org>
Sent: Thursday, October 3, 2024 11:44 AM
To: discuss at mpich.org <discuss at mpich.org>
Cc: Palmer, Bruce J <Bruce.Palmer at pnnl.gov>
Subject: [mpich-discuss] Maximum number of communicators

Hi, I’m looking at using MPI RMA to support sparse data structures in Global Arrays. I’ve got an application that uses a large number of sparse arrays and it is failing when the number of sparse arrays reaches about 500. Each sparse array is
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Hi,



I’m looking at using MPI RMA to support sparse data structures in Global Arrays. I’ve got an application that uses a large number of sparse arrays and it is failing when the number of sparse arrays reaches about 500. Each sparse array is built on top of 4 conventional global arrays and each global array uses one MPI Window. Each Window appears to be creating its own communicator and I’m hitting an internal limit at 2048 communicators. Is there a way to increase the number of communicators?



Bruce Palmer
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