Ticket #919 (new bug)

Opened 3 weeks ago

Allgatherv performance

Reported by: balaji Owned by: balaji
Priority: major Milestone: mpich2-1.3
Component: mpich2 Keywords:
Cc:

Description

One of the users reported a performance problem for Allgatherv for non-power-of-2 number of processes on large systems. On reading through the code, it looks like our algorithms rely on the "total message size" gathered, rather than the message size contributed by each process. So, for large-scale systems, even small message sizes go through an O(P) algorithm.

We should take another look at the irregular collectives to improve these cases.

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Add/Change #919 (Allgatherv performance)

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