Messages in this thread | | | Date | Tue, 30 Sep 2008 02:37:57 -0700 (PDT) | From | Parav Pandit <> | Subject | Re: Calculating time in order of 0.1usec on x86 system |
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I am getting my desired numbers. get_cycles()/cpu_khz gives the right time interval on x86 system.
Parav
--- On Tue, 9/30/08, Parav Pandit <paravpandit@yahoo.com> wrote:
> From: Parav Pandit <paravpandit@yahoo.com> > Subject: Calculating time in order of 0.1usec on x86 system > To: "Linux kernel" <linux-kernel@vger.kernel.org> > Date: Tuesday, September 30, 2008, 12:31 PM > Hi, > > I need to calculate time spent by a function in order of > less then a microsecond on x86 SMP platform. > > Current profiling tools and gettimeofday() are not > sufficient. > > So I am using get_cycles() to get the CPU cycles. > > Now how do I convert it into the time interval? > > Do I have to divide it by "cpu_khz" variable? Or > some other method? > Is yes, what will be the unit of the result (time > interval)? nsec/usec/msec? > > e.g. get_cycles()/cpu_khz (unit?) > > Or Is there more simpler method exist? > > Regards, > Parav Pandit > > > > -- > To unsubscribe from this list: send the line > "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at > http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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