[mpich-discuss] Efficient message size for MPI_Bcast

Mccall, Kurt E. (MSFC-EV41) kurt.e.mccall at nasa.gov
Fri Apr 23 14:31:00 CDT 2021

I have a file containing multiple Mb of data that I need to be read by all of my processes.   I'm assuming it is more efficient to have one process read it in and then broadcast it to the rest, rather than have all processes (about 20) hammer our NFS server (?).

I can potentially break the data into multiple broadcast messages.   What is the recommended maximum message size for MPI_Bcast?

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