[mpich-discuss] multi threading

[David R Anderson]

I have mpich2 (1.0.6) installed on a Dell poweredge compute server with 
Red Hat Linux installed.  The server is new and has 4-quad core 
processors.  I have compiled mpich2 using the --enable-threads=multiple 
option for configure.   After compiling mpi versions of several programs I 
find that I get good speedup results up to 8 processors, however, no 
benefit from 9-16.  There is a small drop in performance from 8-9 and then 
by 16 processors has caught back up to the same speedup value as with 8.

Is there something else I need in the config options, or is dual threading 
the best that I can get?  I'd appreciate any advice.

Thanks in advance,

Dave
---------------------------------------------------
David R. Anderson
Principal Engineer
D412, Radiation Analysis Section
Phone: (860)433-6584, FAX (860)433-3229
E-mail: danders3 at gdeb.com
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