Wednesday, January 14, 2009

Interesting MPI Communication

  1. time(MPI_ALLREDUCE) > time(MPI_REDUCE+MPI_BCAST)
  2. time(MPI_REDUCE) > time(MPI_BARRIER+MPI_REDUCE)
Duuuuuuh

(update: no, barrier doesn't help, the problem was due to faulty nodes)

Posted by Mengjuei Hsieh at 12:40 PM
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