[erlang-questions] System timers, now/0, and instrumentation

Mike Oxford <>
Wed May 25 18:49:35 CEST 2011


Write a port driver to a serial-based external timer.  Maybe an atomic
clock.

=P

-mox

On Wed, May 25, 2011 at 2:21 AM, Amy Lear <> wrote:

> On Wed, May 25, 2011 at 2:07 AM, Raimo Niskanen
> <> wrote:
> > The reason the provided profiling tools rely on now/0 is mostly
> > that it has been around as long as they, plus the fact that
> > now/0 never moves backwards, mostly moves forwards kind
> > of sanely and is fairly lightweight makes it a nice but possibly
> > somewhat inaccurate compromise for a generic profiling tool.
>
> This makes sense.
>
> > No. There is currenly nothing better built in than erlang:now/0 and
> > os:timestamp/0. They could probably be improved on Windows but it
> > was quite a while since we had anyone requiring (as in providing
> > resources) us developing Erlang for Windows.
> >
> > Side note: timer:tc/2,3 is about / has been converted to use
> > os:timestamp/0 instead.
>
> Okay, good to know. I'm continuing to look into it from my end, and
> maybe I'll find something that could be usable to other people.
>
> Thanks for your time and attention.
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