[Bioclusters] NFS performance with multiple clients.
Humberto Ortiz Zuazaga
humberto at hpcf.upr.edu
Wed Nov 24 08:44:00 EST 2004
I'm bringing up a fairly large cluster (85 dual Xeon 2.4 GHz) for
bioinformatics work at the University of Puerto Rico.
We've only got 12 nodes or so up (AC problems), and our users are
already complaining about lousy disk IO.
I've written up a summary of some tests I've run, I'd like people to
read it and tell me if this performance is adequate for our hardware, of
if we should be looking for problems.
http://plone.hpcf.upr.edu/Members/humberto/Wiki_Folder.2003-07-17.5848/NfsPerformanceTests
Here is a summary of bonnie++ results for 1, 2, 4, 6 and 8 simultaneous
bonne runs on the cluster, these are the average of however many bonnie
processes were run simultaneously, results are in KB/sec.
#Procs ch-out blk-out rw ch-in blk-in
1 10285 10574 12116 28753 71982
2 4296 4386 954 16965 22997
4 2336 2266 412 7870 7913
6 1098 602 286 2789 3545
8 1322 970 181 2518 2750
The rw (rewrite) results are especially lousy. Even with two bonnie
clients, performance drops precipitously.
Any comments, tips or suggestions?
--
Humberto Ortiz Zuazaga
Programmer-Archaeologist
High Performance Computing facility
University of Puerto Rico
http://www.hpcf.upr.edu/~humberto/
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