RE: Hyperthreading - Oracle license
- From: "Rich Jesse" <rjoralist2@xxxxxxxxxxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 10 Jan 2013 16:30:38 -0600 (CST)
Mark writes:
> Actually, a quick MOS search, and Oracle specifically recommends staying w/
> the "doubled" count for cpu_count.
>
> See Doc ID 289870.1
I saw that, too, and I'm calling "BS" on the lack of evidence, empirical or
otherwise. Unless it can be claimed that turning HT on gives one at or near
a 100% gain in CPU power, it stands to reason that Oracle cannot consume at
or near an additional 100%. And I'm reasonably certain that no one is
advocating HT as giving anywhere near another the performance of another
core.
I understand that the CPU_COUNT isn't based on the raw CPU power. Perhaps
the suggestion was made *assuming* the reader would somehow magically
consider recollecting system stats after turning on HT?
Call me paranoid (no, really, go ahead), but it just doesn't smell right...
Rich
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