Check_load

[Tiernan, Michael C.]

On Behalf Of Derek J. Balling
	Sent: Wednesday, May 10, 2006 6:52 AM
	To: nagios-users at lists.sourceforge.net
	Subject: Re: [Nagios-users] Check_load

> "load average" is the number of processes (average) in the
> wait state over a given period of time.

Actually, it's the number of processes available to be run, that
includes those running. (i.e. the Run queue).

A 20 processor machine with one job per processor and each processor
"running at 100%" is a load of 20 where the same machine, with the same
20 jobs running *and* 10 jobs waiting to run has a load of 30.

And as Mr Balling rightfully said, it's averaged over 1min, 5min, 15mins
by the OS itself.

Now, this is what I've found on Solaris machines and Red Hat Linux
machines along with the SGI machines I wrangle. It *is* possible that
some other OS defines it differently.
(a.k.a. "Never say Never.")
-- 
    << MCT >> Michael C Tiernan        UNIX Systems Admin II
    Charles Stark Draper Lab., Inc.
    555 Technology Square/MS #33
    Cambridge, MA 02139


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