Re: gettimeofday cost on intel?
Re: gettimeofday cost on intel?
- Subject: Re: gettimeofday cost on intel?
- From: Matt Watson <email@hidden>
- Date: Tue, 9 May 2006 09:44:09 -0700
On May 9, 2006, at 9:32 AM, Andrew Gallatin wrote:
Matt Watson writes:
On May 9, 2006, at 8:11 AM, Andrew Gallatin wrote:
I need a cheap way to measure events with at least a 10ms
granularity
that is monotonically increasing, regardless of the CPU my thread
has
been scheduled upon.
I'd be surprised if mach_absolute_time() does not work for this.
I did not know about this. Nm reveals its symbol in libc (at least on
ppc). Is it documented somewhere? Does it also use the commpage?
Yes, it uses the commpage. Here's a technote on its usage:
http://developer.apple.com/qa/qa2004/qa1398.html
If you don't need the conversion to nanoseconds, you can just use the
raw function.
matt.
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