Re: NTP Sync Issue Across Tata (Europe)

[Masataka Ohta <mohta () necom830 hpcl titech ac jp>]

Mel Beckman wrote:

> To be useful, any atomic clocks you operate must be synchronized
> to a Stratum Zero time source, such as GPS.

Only initially.

> Precise time is crucial to a variety of economic activities around
> the world. Communication systems, electrical power grids, and
> financial networks all rely on precision timing for synchronization
> and operational efficiency. The free availability of GPS time has
> enabled cost savings for companies that depend on precise time and
> has led to significant advances in capability.

FYI, time difference between two points is not noticeable, that
is, does not affect correctness of any distributed algorithm,
if the difference is below the communication delay between
the points, which means rough synchronization by NTP is
good enough.

That is an information theoretic version of relativity of simultaneity:

        https://en.wikipedia.org/wiki/Relativity_of_simultaneity

For information theoretic simultaneity, you can consider, instead
of light cone, information cone.

                                                Masataka Ohta