Re: How to get CPU cycles per sec?
On Sun, Jul 25, 2004 at 10:32:24PM +1000, Paul Ripke scratched on the wall:
On Sunday, Jul 25, 2004, at 00:08 Australia/Sydney, Lalit Chandivade
wrote:
Hi
As per the following discussion
gettingsystemperfo
rmance.001.txt
clock_get_uptime gives system up time in CPU cycles.
Is there a way in kernel or IOKit to know the CPU cycles per second?
A little digging through xnu source should show where this is coming
from:
pbg3:ksh$ sysctl hw.cpufrequency
hw.cpufrequency = 300000000
Are there any known problems with this call? On my 800MHz TiBook, it always returns "hw.cpufrequency: 667000000". And, yes, it is really an 800MHz TiBook. At least that's what the box said (and what the bill said!). System Profiler also says 800MHz. But sysctl always says 667MHz. -j -- Jay A. Kreibich | Integration & Software Eng. jak@uiuc.edu | Campus IT & Edu. Svcs. <http://www.uiuc.edu/~jak> | University of Illinois at U/C _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.
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Jay A. Kreibich