Date: Sun, 10 Nov 2002 12:15:02 -0600 From: Duane Attaway <dattaway@attaway.net> Subject: Re: Monitoring CPU Process Usage Message-ID: <Pine.LNX.4.44.0211101137410.24016-100000@attaway.net>
On Sun, 10 Nov 2002, Scott Bowling wrote:
> I've got a CGI script that I'd like to determine how much CPU usage it uses
> over a period of time... let's say for a week.
cat /proc/<process id>/stat
We can get exactly what you need down to each 1/100th of a second right
from the /proc directory. And the best recepie for this is straight from
the command line, perfect for scripting. The /proc/stat entry will serve
you these juicy morsels (from the proc manpage:)
stat kernel/system statistics. Varies with architec-
ture. Common entries include:
cpu 3357 0 4313 1362393
The number of jiffies (1/100ths of a second)
that the system spent in user mode, user
mode with low priority (nice), system mode,
and the idle task, respectively. The last
value should be 100 times the second entry in the
uptime pseudo-file.
Of course, stat will give you more than just those four numbers, but the
man page lists all the values given, in order. The two values you might be
interested in (with the scanf code:)
cutime %ld
The number of jiffies that this pro-
cess and its children have been
scheduled in user mode.
cstime %ld
The number of jiffies that this pro-
cess and its children have been
scheduled in kernel mode.