Please see another ongoing thread on this list about this exact topic:
http://www.open-mpi.org/community/lists/users/2008/04/5457.php
It unfortunately has a subject of "(no subject)", so it's not obvious
that this is what the thread is about.
On Apr 23, 2008, at 12:14 PM, Ingo Josopait
I noticed that the cpu usage of an mpi program is always at 100 percent,
even if the tasks are doing nothing but wait for new data to arrive. Is
there an option to change this behavior, so that the tasks sleep until
new data arrive?
Why is this the default behavior, anyway? Is it really so costly
