On 28/07/17 09:05, Richard Braun wrote: > On Thu, Jul 27, 2017 at 11:39:21PM +0100, James Cowgill wrote: >> While debugging a timing problem with FFmpeg on Hurd, I noticed that the >> "clock" function has a far lower precision on Hurd than it does on >> Linux, even though CLOCKS_PER_SEC is 1000000 on both. Why is this? >> >> I also found this patch to libc which may be responsible: >> hurd-i386/unsubmitted-clock_t_centiseconds.diff >> >> I'm not entirely sure why patching libc is appropriate to fix the >> claimed issues. > > The patch has nothing to do with precision. The kernel simply doesn't > have any high resolution timing system, whereas Linux does.
In that case, clock should be returning multiples of whatever precision is supported by the kernel so that CLOCKS_PER_SEC is still correct. James
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