On Thu, Sep 06, 2001 at 03:50:01PM +0200, Robert Waldner wrote:
>
> On Thu, 06 Sep 2001 09:34:05 EDT, Peter Billson writes:
> >> cat /proc/meminfo
> >> cat /proc/loadavg
> >
> > The meminfo would help him but he posted that he didn't understand load
> >average and, anyway, needs percent of CPU used. You can not calculate
> >CPU usage from load average.
>
> Not to mention the deep dark magic by which loadavg is generated. I
> still donīt understand that completely ;-)
>
> And yep, that shouldīve read
> cat /proc/stat
> instead. (And no, I donīt know what the values in the first line
> exactly mean, but as soon as I set up mrtg again, Iīm gonna read up on
> the kernel-sources)
The problem with using /proc/stat is the values presented on the cpu
line are running totals of jiffies spent in user, nice, system, and
idle respectively. So, you have to read /proc/stat at least twice and
then calculate the deltas (and average over the time delta if you seek
an average. Reading man proc and the source code (proc_misc.c;
function kstat_read_proc) helped a lot; man proc seems a bit out of
date WRT 2.4.x kernels.
Yesterday I wrote a perl script that does this (I'm playing with
cricket ... see
http://canaris.visionary.micromuse.com/cgi-bin/cricket/grapher.cgi?target=%2Fservers
I'll make the script source available if someone wants it ... I use a
db file to store the readings from each run for use in the next run.
My loadavg figures come from /proc/loadavg ... I wasn't interested in
any heavy lifting :)
Now for the mem stats ...
--
Nathan Norman - Staff Engineer | A good plan today is better
Micromuse Ltd. | than a perfect plan tomorrow.
mailto:[EMAIL PROTECTED] | -- Patton
PGP signature
