[erlang-questions] process stats

Joe Armstrong erlang@REDACTED
Fri Nov 2 22:50:47 CET 2012

Take a look at the code in observer_backend.erl
This is used by things like etop etc to collect performance data about


On Fri, Nov 2, 2012 at 5:39 AM, József Bérces <jozsef.berces@REDACTED>wrote:

> **
> Hi,
> I am writing an application that runs in the background crunching some
> data and writing result files to the disk. It has a web interface to
> configure what data and how to process. And I was thinking about that it
> would be good to be able to present some stats on the web interface about
> which Erlang processes how much CPU resources used during the last
> second/minute/day/week etc.
> Is there any way to get this kind of info somehow without wasting too much
> resources on the stat collection itself? I do not want it for all Erlang
> processes, only for a well defined subset of them.
> eprof/fprof seem to be too heavy: they would take too much system
> resources and they would produce too detailed data for me.
> erlang:system_profile seems to be promising (I have not started playing
> with it) but it has that note in the doc that it is experimental so I am a
> bit afraid of it.
> I was also thinking about tracing my processes with the flag 'running' so
> I would get 'in' and 'out' message tags in a profiling process. I am not
> sure how much resources this would take.
> Any suggestions are welcome!
> Thanks,
> Jozsef
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