Re: Monitoring CPU usage of a process

[Andrew Perrin <clists@perrin.socsci.unc.edu>]

There are easier ways than these, at least with this ps:
nujoma:~> ps --version
procps version 2.0.7

nujoma:~> ps -opid,cmd,%cpu -p 4400
  PID CMD              %CPU
 4400 -csh              0.0
nujoma:~> ps -opid,cmd,%cpu -C ps
  PID CMD              %CPU
 4436 ps -opid,cmd,%cp  0.0


put into a cron script or just dumped to a file, you'll have what you need
- no piping, grepping, etc., required.

If you're monitoring from within a perl script (which I often do), you can
do something like:

sub check_ps {
	print LOG `/bin/ps -o%mem,%cpu -p$$`;
}

and then just throw in check_ps; statements wherever useful.

Hope this helps.


----------------------------------------------------------------------
Andrew J Perrin - http://www.unc.edu/~aperrin
Assistant Professor of Sociology, U of North Carolina, Chapel Hill
clists@perrin.socsci.unc.edu * andrew_perrin (at) unc.edu


On Sun, 2 Jun 2002, Brian Dessent wrote:

> Adar Dembo wrote:
> > 
> > I have some processes whose cpu usage I would like to monitor, and pipe
> > into a file. As far as I know, top can't monitor a single process and
> > send its cpu usage into a file, so I'm wondering what other programs
> > might do this. This is a testing installation, on a computer without any
> > GUI or anything sophisticated like that. Any help is greatly
> > appreciated.
> 
> How about ps piped through grep and then sent to the file?  
> 
> ps -Al | grep foo >> bar
> 
> If you just want cpu usage percent, try this:
> 
> ps -Ao "comm pcpu" | grep foo >> bar 
> 
> Make it into a simple shell script with a loop and a delay if you want a
> periodic output.  Add a call to date if you want timestamps.
> 
> #!/bin/sh
> while sleep 10; do
> 	date +%H:%M:%S >> bar
> 	ps -Ao "comm pcpu" | grep foo >> bar
> done
> 
> There's about a million ways to skin this cat.
> 
> Brian
> 
> 
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