re: Performance Monitoring Counters (PMC, PERFCTRS) and SMP?

matthew green <[email protected]> Mon, 17 Oct 2011 07:11:47 +1100

Newsgroups	gmane.os.netbsd.current,gmane.os.netbsd.devel.smp
Message-ID	<[email protected]>

> On Sat, Oct 15, 2011 at 08:32:26PM -0700, Greg A. Woods wrote:
> > 
> > I ask mostly because I'm flustered by getrusage(2) being as good as
> > useless for even the most basic of benchmarking purposes...
> 
> On NetBSD the sum of the 'sys' and 'user' times is accurate.
> As is the 'child cpu time' for reaped zombies.
> I've used that from ps (with custom columns) to get high resolution
> execution times.

except when time goes backwards....