Understanding time
Loïc Hoguin
essen@REDACTED
Tue Sep 7 08:56:14 CEST 2021
It is not strictly monotonic, see the note:
https://erlang.org/doc/man/erlang.html#monotonic_time-0
Also see this if you need ordered events:
https://erlang.org/doc/apps/erts/time_correction.html#Dos_and_Donts_Determine_Order_of_Events_With_Time_of_the_Event
Cheers,
On 07/09/2021 08:27, Frank Muller wrote:
> Hi Everyone
>
> Yesterday, a Java developer told me that getting unique timestamps is
> only guaranteed to be possible between COREs on the same CPU. Stated
> otherwise, two processes on two different CPUs could get the same timestamp.
>
> I’m now wondering if calls to “erlang:system_time/1” are strictly
> monotonic
> (https://erlang.org/doc/apps/erts/time_correction.html#strictly-monotonically-increasing)
> between Erlang processes on the same scheduler, and even between Erlang
> processes on different schedulers.
>
> Can anyone clarify please?
>
> /Frank
--
Loïc Hoguin
https://ninenines.eu
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