From: Kero <kero@...>
Date: 2005-11-11T08:42:13+09:00
Subject: Re: [SORTA OT] Getting CPU usage of a process

> I'd like to be able to get the CPU usage of a particular process. 
> What are my options for doing so from Ruby?
>
> I've found the libgtop ruby binding, and I could use that, but I would
> rather not bring in another dependency.  This will run on Linux
> systems only.
>
> And would I want to use the elapsed real cpu time?  Or the sum of the
> elapsed user and system cpu time?  (and then I believe I divide that
> by the elapsed wall clock time)

man proc, look for "/proc/[number]/stat"
It contains a set of times spent by the process and its children.
it also contains the starttime, so this should allow you to compute "Cpu
usage of the process".

Hth,
Kero.

+--- Kero ---------------------------------- kero@chello@nl ---+
|  The last good thing written in C++ was the Pachelbel Canon  |
|  Jerry Olson                                                 |
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