4 ms·
Microseconds are not enough, because the arbitrage works by the HFT setting the order in one place, and then rushing the arbitrage to the other place. As long a
by jwatte 10y ago
Microseconds are not enough, because the arbitrage works by the HFT setting the order in one place, and then rushing the arbitrage to the other place. As long as you're more coordinated than speed of light between the two locations, you're fine.
Also, GPS clocks are cheap and precise, atomic clocks seem gold plating. (Which sometimes is actually necessary in electronics, BTW...)
- eru 10y agoGPS 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 10y agoI 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 10y agoYes, I think you are right.