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eru
on July 11, 2016
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Hedge Fund Wants to Use Atomic Clocks to Beat High...
GPS can fail. Atomic clocks give you a second system to fall back on.
At Google, we use both GPS and atomic clocks for Spanner.
curiousDog
on July 11, 2016
[–]
I think the main innovation in Spanner is the notion of Truetime not the atomic/gps clocks though. In fact MSR has come up with something called ClockSI that does global snapshots with a modified NTP I believe.
eru
on July 12, 2016
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Yes, I think you are right.
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At Google, we use both GPS and atomic clocks for Spanner.