[mpich-discuss] Max Communicators Limit

Rob Latham robl at mcs.anl.gov
Tue Sep 9 13:27:16 CDT 2014

On 09/09/2014 01:19 PM, Venkat Vishwanath wrote:

> There is  a maximum # of communicators one can create. How can I query this 
limit for MPICH? Is there a standard way to query this limit across MPI 

Huh. It would appear not:
Cray uses an environment variable:
Intel asserts it's ~16k:
- https://software.intel.com/en-us/forums/topic/279324
MPICH limit used to be 8189:
- http://www.mcs.anl.gov/papers/P1621A.pdf

I guess the way to query is "create until it fails" ?

Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA

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