[erlang-questions] Replacing erlang:now/0 for getting a unique number

Theepan <>
Fri Sep 18 09:30:13 CEST 2015

It depends on where you want the number to be unique (intra node/inter
node), and the frequency of unique number generation (system calls are
heavy), you can look at how you are generating the unique number. You can
look at just having a counter too.


On Fri, Sep 18, 2015 at 12:34 PM, Martin Koroudjiev <>

> Hello,
> I have code that users erlang:now/0 to get a unique number. What is the
> alternative in OTP 18? In the documentation for erlang:monotonic_time/0
> says that consecutive calls might produce same results.
> Thanks,
> Martin
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