Negative Impact of Hyper Threading and Essbase

Hi,
It has come to my attention that on some Hyperion Apps, it is NOT recommended that Hyper Threading is used. Can anyone clarify this? I have searched Oracle and have found nothing concrete on this subject.
Thanks,
Sam

Hi Sam,
I didn't know anything about this issue so I asked some of my friends at Oracle.. Here are a couple of tidbits I dug up:
"For production environment, as you aware of, Essbase Calculation Engine is one of the world's most advanced number-crunching engines. And usually number crunching applications require intensive floating-point computations; therefore, to get the best performance, expend your resources to acquire the fastest CPU you can. Opt for a faster CPU instead of better L2 and L3 cache, if you have the money, go for the better L2 cache first and then better L3 cache. Note that L2 and L3 cache make a much bigger difference in OLAP applications than in OLTP applications (please note, Essbase does not utilize hyperthreaded CPUs or Hyper-Threading Technology)."
Another tidbit:
"As to hyperthreading,we have not had any real issues with it. The only thing that really ends up being a problem is that hyperthreading seems to limit the available memory".
So, unofficially, there are a couple of pieces of information for you.
Tim Tow
Oracle ACE
Applied OLAP, Inc

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