Options for specifying message length while running IMB-MPI1

intel / mpi-benchmarks

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Closed aolia-0303 closed 8 months ago

aolia-0303 commented 4 years ago

Hello,

I would like to know if there are options for specifying message length.

Currently the default message length configuration is:

# Minimum message length in bytes:   0
# Maximum message length in bytes:   4194304

It seems that the -msglen option is not used to achieve this.

VinnitskiV commented 4 years ago

Hi @aolia-0303, thank you for your interest. For changing message length(like min\max) you need to use -msglog option:

mpirun -n 2 IMB-MPI1 -msglog min_msglog:max_msglog For using special sizes(which are not powers of 2) you must to create file(for example lengths.txt) with this sizes and pass this file like this:
mpirun -n 2 IMB-MPI1 -msglen lengths.txt You can find more information:
IMB-MPI1 -help
IMB-MPI1 -help msglen
IMB-MPI1 -help msglog