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Re: MPI on a SMP multi-core machine

On 13 February 2007 at 15:47, Ricardo Yanez wrote:
| I'm trying out a dual quad-core Xeon EM64T machine in parallel with MPI
| (etch). I ran into problems... I can run 5 processors, but not 6,7,8. The
| machine slows down considerably. LAM-MPI and MPICH show exactly the same
| behavior. Has anyone had similar problems when running MPI on a SMP
| multi-core machine? Any solutions?

Yes, I do launch 8 MPI jobs on a dual cpu quad-core box. 

Maybe you have too little ram relative to the load you are putting on?


Hell, there are no rules here - we're trying to accomplish something. 
                                                  -- Thomas A. Edison

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