[mpich-discuss] Question about mpich bandwidth vs message-size plot

Congiu, Giuseppe gcongiu at anl.gov
Wed Nov 27 13:48:33 CST 2019

Sajid please use latest mpich master branch from www.github.com/pmodels/mpich<http://www.github.com/pmodels/mpich>. This contains the bug fix that was merged with the following PR: https://github.com/pmodels/mpich/pull/3947

Giuseppe Congiu
Postdoctoral Appointee
MCS Division
Argonne National Laboratory
9700 South Cass Ave., Lemont, IL 60439

On Nov 27, 2019, at 11:15 AM, Sajid Ali via discuss <discuss at mpich.org<mailto:discuss at mpich.org>> wrote:

Hi Jeff/Giuseppe,

I spoke to the computational specialist from research IT and he confirmed that this particular build of MPICH is indeed broken. As Giuseppe pointed out the hydra launcher was running multi threaded jobs on each node because it was unable to read the nodelist. When we passed a nodelist to mpirun and repeated the same test, the results looked more reasonable (~80us latency instead of ~0.05us due to ch3:TCP). Thanks for the help!

Sajid Ali | PhD Candidate
Applied Physics
Northwestern University
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