Re: How to get CPU cycles per sec?
Re: How to get CPU cycles per sec?
- Subject: Re: How to get CPU cycles per sec?
- From: "Jay A. Kreibich" <email@hidden>
- Date: Sun, 25 Jul 2004 15:30:42 -0500
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
>
>http://lists.apple.com/archives/darwin-kernel/2004/Mar/31/
>
>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.
email@hidden | Campus IT & Edu. Svcs.
<
http://www.uiuc.edu/~jak> | University of Illinois at U/C
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