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Re: Debian Hurd clock precision

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.


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