( ESNUG 442 Item 14 ) ------------------------------------------- [03/24/05]
From: Bob Flynn <bob.flynn=user domain=s3group spot calm>
Subject: What's the Benefit of LSF Linux Hyperthreading for EDA Tools?
Hi, John,
I am looking to get some feedback from people regarding the cost/benefit
in enabling/disabling hyperthreading on Linux boxes on LSF farms aimed
squarely at EDA tool use.
Basically, the issue is LSF licenses based on CPUs. In the case of
hyperthreading, it sees the dual cores as separate CPUs and assigns
licenses accordingly. Now you can enable or disable hyperthreading at
the BIOS level.
My question is: "Is there a performace benefit in hyperthreading to leave
it enabled and simply go with additional LSF licenses?" Considering the
cost of the tools running on the system, its not a huge issue, i.e. go
get extra boxes and be done with it. However I am curious as to anyone
has any benchmarking, or comments in this area. My first guess is that
it may make sense in processer intensive jobs, but less so in memory
intensive jobs. Is this right?
- Bob Flynn
S3 Group San Jose, CA
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