[mpich-discuss] MPI_Allgatherv complexity

[Justin Luitjens]

Hi,

I'm wondering what is the parallel complexity of MPI_Allgatherv.  I would
suspect in the worst case it would be something like N log P but from the
timings i'm collecting this doesn't seem to be the case.  I'm running tests
on Kraken (http://www.nics.tennessee.edu/computing-resources/kraken
) and it looks like it might be something like P log P.

Thanks,
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