Wow, that's quite a .sig. :-)
Open MPI will automatically stripe large messages across however many
NICs you have. So you shouldn't need to use multiple threads.
The threading support in the OMPI v1.2 series is broken; it's not
worth using. There's a big warning in configure when you enable it. :-)
On Dec 5, 2007, at 9:57 PM, Tee Wen Kai wrote:
Hi everyone,
I have installed openmpi-1.2.3. My system has two ethernet ports.
Thus, I am trying to make use of both ports to speed up the
communication process by using openmp to split into two threads.
However, this implementation always cause error. Then I realized
that I need to build openmpi using --enable-mpi-threads and use
MPI_Init_thread to initialize. But, the initialization always return
MPI_THREAD_SINGLE no matter what value I set. Using ompi_info|grep
Thread, it shows that thread support has already been activated.
Thus, I seek your help to teach me what other configurations I need
to set in order to use multi-threads and what are the parameters to
include in mpirun in order to use the two ethernet ports.
Thank you very much.
Regards,
Tee
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Jeff Squyres
Cisco Systems
