<br><font size=2 face="sans-serif">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.</font>
<br>
<br><font size=2 face="sans-serif">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.</font>
<br><font size=2 face="sans-serif"><br>
Thanks in advance,</font>
<br><font size=2 face="sans-serif"><br>
Dave</font>
<br><font size=2 face="sans-serif">---------------------------------------------------<br>
David R. Anderson<br>
Principal Engineer<br>
D412, Radiation Analysis Section<br>
Phone: (860)433-6584, FAX (860)433-3229<br>
E-mail: danders3@gdeb.com<br>
</font>