On Fri, Aug 1, 2014 at 3:13 PM, H. Peter Anvin <h...@zytor.com> wrote: > On 08/01/2014 03:11 PM, Denys Vlasenko wrote: >>> >>> Could you please try to see if there is a measurable change in the >>> latency of a trivial syscall? >> >> Will do. >> Something along the lines of "how long does it take to execute two >> gazillions of getppid()?" >> > > Something like that, yes, but you have to run enough data points so you > can determine if the difference is statistically significant or just noise.
Denys, if you want to avoid five minutes of programming, you can build this: https://gitorious.org/linux-test-utils/linux-clock-tests/ and run timing_test_64 10 getpid It doesn't do real statistics, but it seems to get quite stable results. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
