Performance Variations using MPI/Myrico

[Thomas Davis]

We are looking for sites that run Intel Linux/SMP(dual)/MPI/Myricom 2k,
and have experienced performance variations.  IE, you've ran the NAS/FT
parallel benchmark, densely packed (using all CPU's on the nodes), and
noted that the runs come up different each time - and the difference is
not minor (as much as 80%).

Our questions are:

1) Did you figure out what caused the variation?

2) What did you do to fix this problem?

3) Any ideas on what could cause this much variation?

Thanks!

--
------------------------+--------------------------------------------------
Thomas Davis            | ASG Cluster guy
tadavis at lbl.gov         |
(510) 486-4524          | "80 nodes and chugging Captain!"