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? Thanks, Lalit. _______________________________________________ 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.