Intel cpu hyperthreading on or off for ibm db2?

Posted by rtorti19 on Server Fault See other posts from Server Fault or by rtorti19
Published on 2012-09-26T20:48:16Z Indexed on 2012/09/26 21:39 UTC
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linux

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database-performance

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db2

Has anyone ever done any database performance comparisons with hyper-threading enabled vs disabled? We are running ibm db2 and I'm curious if anyone has an recommendations for enabling hyper-threading or not. With hyper-threading enabled it makes it quite difficult to do capacity planning for cpu usage.
For example. "With 8 physical cores represented as 16 "threads" on the OS and a cpu-bound workload, does that mean when your cpu usage hit's 50% you are actually running at 100%."

What real benefits do I gain with leaving hyper-threading enabled on an intel server running DB2? Does hyper-threading help if you're workload is truly disk IO bound? If so, up to what percentage?

These are the types of questions I'm trying to answer. Any thoughts?

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