RE: Hyperthreading - Oracle license

From: Rich Jesse <>
Date: Thu, 10 Jan 2013 16:30:38 -0600 (CST)
Message-ID: <>

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...


Received on Thu Jan 10 2013 - 23:30:38 CET

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