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Simon Wright <simon@pushface.org> writes:
> What about the bank keeping track of your money?

Not realtime, or at least not hard realtime.  Nobody cares if checking
your bank balance online takes a millisecond longer than it was supposed
to.  They might care about the statistical distribution of the latency
but they don't care at all about a single query.  (Hard) realtime means
that disaster ensures if a deadline is missed even once.

> What about those crazy high-frequency traders?

Their machines are not in data centers.