[Beowulf] Opinions of Hyper-threading?

[Jon Forrest]

I inherited a cluster containing a bunch
of Xeon-based compute nodes. The compute
nodes were configured with hyper-threading
turned on. I'm wondering what you HPC cluster
people think of hyper-threading. I haven't
heard much about it recently since most
modern processors are true multi-core.

The main thing I'd like to know is whether
hyper-threading can do any harm when cpu
bound jobs are run.

Cordially,
-- 
Jon Forrest
Research Computing Support
College of Chemistry
173 Tan Hall
University of California Berkeley
Berkeley, CA
94720-1460
510-643-1032
jlforrest at berkeley.edu