Lynne E. Bilston
l.bilston at unsw.edu.au
Fri May 10 04:24:13 CEST 2002
I'm running the dppc benchmark on my new systems, and have found that it
takes longer to run the benchmark if I run it over two dual cpu machines
than running it on a single dual cpu machine, although the logfiles report
76% scaling and 99% scaling respectively. I'm using dual athlons with 100
Mb ethernet, and RH7.2.
I assumed this means that the communication between the two machines is the
bottleneck. (I'm using an old switch while I wait for the new one)
However, in the logfile there are some comments about load balancing
reducing performance. Is this something to look at?
Any suggestions for how to figure out what lam-mpi is doing during the
parallel runs so i can confirm that it is my switch that's the problem? I
don't get anything enlightening from the basic mpitask or mpimsg commands.
Lynne E. Bilston, PhD
Senior Scientist, Prince of Wales Medical Research Institute, and
Conjoint Associate Professor, Faculty of Medicine, University of New South
Barker St, Randwick, NSW 2031 Australia
Tel: +61-2-9382-7924 Fax: +61-2-9382-2643
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