[mpich-discuss] Better alternatives of MPI_Allreduce()

[hritikesh semwal]

Hello all,

I am working on the development of a parallel CFD solver and I am using
MPI_Allreduce for the global summation of the local errors calculated on
all processes of a group and the summation is to be used by all the
processes. My concern is that MPI_Allreduce is taking almost 27-30% of the
total time used, which is a significant amount. So, I want to ask if anyone
can suggest me better alternative/s to replace MPI_Allreduce which can
reduce the time consumption.

Thank you.
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