On May 2, 2012, at 6:22 AM, Brice Goglin wrote:
>> - Fix some process affinity issues. When binding a process, Open MPI
>> will now bind to all available hyperthreads in a core (or socket,
>> depending on the binding options specified).
> Is this really what you mean? Isn't hyperthreading ignored by default?
If hyperthreading is enabled on the machine and you "mpirun --bind-to-core", we now bind each process to all hyperthreads in the core. Previously, we only bound to the first hyperthread in the core.
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