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

Sajid Ali sajidsyed2021 at u.northwestern.edu
Wed Nov 27 11:15:13 CST 2019

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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