[Python-Dev] PEP 564: Add new time functions with nanosecond resolution

[Antoine Pitrou]

On Tue, 24 Oct 2017 09:00:45 +0200
Victor Stinner <victor.stinner at gmail.com> wrote:
> By the way, you mentionned that clocks are not synchronized. That's another
> revelant point. Even if system clocks are synchronized on a single
> computer, I read that you cannot reach nanosecond resolution for a NTP
> synchronization even in a small LAN.
> 
> For large systems or distributed systems, a "global (synchronized) clock"
> is not an option. You cannot synchronize clocks correctly, so your
> algorithms must not rely on time, or at least not too precise resolution.
> 
> I am saying that to again repeat that we are far from sub-second nanosecond
> resolution for system clock.

What does synchronization have to do with it?  If synchronization
matters, then your PEP should be rejected, because current computers
using NTP can't synchronize with a better precision than 230 ns.

See https://blog.cloudflare.com/how-to-achieve-low-latency/

Regards

Antoine.