[erlang-questions] Get Erlang node uptime and way to test it is working

Rickard Green rickard@REDACTED
Tue Jun 20 12:56:24 CEST 2017

tis 20 juni 2017 kl. 09:21 skrev Mithun B <mithunb@REDACTED>:

> Hi all,
> We are using "erlang:statistics(wall_clock)" to get the Erlang node up
> time in millisecond.
> It works fine till 49 days, but on 49th day it will role back to start
> from 0 millisecond.
> I need to know two things here, First of all, a different method for how
> to test it, I don't want to wait for 49+ days to see it works or not.
> Secondly, I need to know a method which gives proper up time even after
> 49+ days. How about following:
> "(erlang:monotonic_time() - erlang:system_info(start_time)) div 1000000000"

Apart from the assumption of nanosecond native time unit this is the way to
do it. Use erlang:convert_time_unit() instead. There are Erlang systems not
using nanoseconds as native time unit.

Rickard Green, Erlang/OTP

> If any one having more insight on this, please shed some light on these
> topics.
> Thanks and regards,
> Mithun B
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Rickard Green, Erlang/OTP, Ericsson AB
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