[lug] Determining CPU usage

[Jim Buzbee]

On Thu, 1 May 2008, Zan Lynx wrote:

...

> To get the value you want, you'd add up the user, system and nice used
> time and store it, get the total run time and store it, then wait 1
> second and do it again.  Find the differences and calculate your 1
> second CPU% usage.

...

Now that I think about it a bit more, I probably need to re-architect what
I'm doing.  If I'm asking for CPU usage, it is over some time period
(e.g. 1 second, as above).  So if I loop one at a time through all of my
pids, which could be 30 or more, it will take 30 seconds minimum for my
script to run. What I really need to do is gather all the pids up and do
the calculation for them simultaneously.

Jim

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