[time-nuts] Re: What everyday uses are there for accurate clocks?

[Hal Murray]

Dr. David Kirkby said:
> I can���t see how knowing who posted what first on Facebook, Instagram etc
> affects the user experience, when differences in time are any less than a
> second.

It doesn't make any difference to the people which of two really-close events 
happens first.

What does matter is that separate data centers agree.  It's a data base issue 
rather than a user interface issue.

Google put atomic clocks in all their data centers.

Spanner: TrueTime and external consistency
  https://cloud.google.com/spanner/docs/true-time-external-consistency

----------

Many years ago, it wasn't quite uncommon for Unix shops to get into trouble 
because the time on their systems weren't consistent.  I forget the details.  
It involved NFS - Network File Systems and time on the NFS server being 
different from the time on the workstation used to edit a file.

This looks like a good summary:

why does NFS require synchronized system clocks?
https://unix.stackexchange.com/questions/549550/why-does-nfs-require-synchroniz
ed-system-clocks


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