Just configure the latest version of mpich. It'll figure out the machine architecture and use nemesis shared memory by default. -- Pavan On 05/09/2013 01:28 AM US Central Time, Bob Ilgner wrote:

Dear all,

I am using a large shared memory machine ( > 100 cores) and want to use mpi in nemesis mode. How do I do that ? There is some material in the faq about using ch3. Where does that come in ?

Regards,

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-- Pavan Balaji http://www.mcs.anl.gov/~balaji