[Beowulf] mpi_comm_create scaling issue

[Charlie Peck]

On Sep 5, 2013, at 11:56 AM, xingqiu yuan <xingqiuyuan at gmail.com> wrote:

> Hi ALL
> 
> MPI_COMM_CREATE takes a substantial amount of time on large communicators, any good ideas to reduce the time consuming on large communicators?

Which MPI binding you use can make a difference too, try another one (or two) and see how the performance compares on that call (and other user created communicator calls perform).

charlie