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What is the difference between physical clock and logical clock?
Wiki User
∙ 12y ago
For many appls:
‰ it is sufficient that all machines agree on the same time.
‰ it is not essential that this time also agree with the real time
E.g. make example - it is adequate that all machines agree that it is 10:00
even if it is really 10:02.
Meaning: it is the internal consistency of the clocks that matters, not
whether they are particularly close to the real time.
For these algorithms it is conventional to speak of the clocks as
logical clocks.
„ Counter-ex:
when the additional constraint is present that the clocks
„ must not only be the same,
„ but also must not deviate from the real time by more than a certain amount,
the clocks are called physical clocks.
Wiki User
∙ 12y ago
Bere Getasew
A physical clock measures time based on a physical oscillator like a quartz crystal. A logical clock is used in distributed systems to order events based on causality rather than real time, ensuring consistency even when clocks on different machines are not synchronized.
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