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Re: MT anomaly... [message #15844 is a reply to message #15324]

Sun, 11 May 2008 19:18

tvanriper
Messages: 85
Registered: September 2007
Location: Germantown, MD, USA

Member

Maybe I'm totally off-base here, and I haven't looked at the code, but are you multi-threading at the kernel or user level?

If you're using the POSIX library calls, you're probably multi-threading through user level threading, which means you probably won't get at multiple cores. You're still multi-threading, but at the user level, you can't get at the other core; that requires a system call of some kind that most user level libraries know nothing about.

If you're using the system calls that Linux offers (kernel level threading), then I don't know why you're seeing this kind of performance; you should be seeing both cores used.

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