From: Joe Van Dyk <joevandyk@...>
Date: 2006-01-11T06:42:54+09:00
Subject: Re: Finding CPU% of a linux task

On 1/10/06, James Edward Gray II <james@grayproductions.net> wrote:
> On Jan 10, 2006, at 3:31 PM, Joe Van Dyk wrote:
>
> > However, that doesn't capture threads or forked processes.  If a
> > program starts a couple threads (or forks a child process), I then
> > have to figure out the cpu percentage of each of the child threads
> > (and their childs and their child's childs, and so on) and add them
> > together to get a total for the process.
>
> Ruby's threads are in process, so they should already be in your
> percentage, shouldn't they?

To clarify, these aren't Ruby processes I'm tracking.

Sample usage of my class:

pi = ProcessInfo.new <pid>
pi.cpu_percentage # returns the cpu % of the process
pi.running? # sees if the process is still running

etc

I added ProcessInfo#child_tasks, that searches /proc for all child
tasks of the process.  But then, when I calculate the cpu% of the
process, I need to recursively go in and get all the cpu% of all the
child threads/processes of the process.  And my code got ugly fast.