[mvapich-discuss] performance problems with gath/scat

[Max Suarez]

  We are having serious performance problems
with collectives when using several hundred cores
on the Discover system at NASA Goddard.

I noticed some fixes were made to collectives in 1.5.
Would these help with scat/gath?

I noticed a couple of months ago someone reporting
very poor performance in global sums:

http://mail.cse.ohio-state.edu/pipermail/mvapich-discuss/2010-June/002876.html

But the thread ends unresolved.

Has anyone else had these problems?

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