Re: [cobalt-developers] CPU Load average - acceptable

[Andrew Cudzilo <linuxps@xxxxxxxxx>]

Thank you for clarification :)

--- Paul Gillingwater <paul@xxxxxxxxxxx> wrote:

> Actually, this is not a percentage.  Instead, it's an average over a period of 
> time of how many processes are sitting in the run queue.  Normally, Linux (and 
> other UNIXen) operate a queue for processes that are actively running and a 
> queue for processes that are sleeping (usually waiting on a resource like disk, 
> LAN or serial I/O.)  Generally, most processes are sleeping.  The eighth column 
> of a "ps waux" command under Linux shows the run state for all processes, which 
> is usually S (for Sleep), followed by N for low priority processes or W if 
> there are no pages from the process in memory.  The few processes that are 
> actually busy will show "R" for Run.  
> 
> It is quite possible for the load average to exceed 1 (therefore it's not a 
> percentage), when there are two or more processes running continuously for over 
> 5 minutes (e.g., ray tracing.)  I've seen some UNIX systems with load averages 
> in excess of 25, however this indicates very heavy load.  There's no hard and 
> fast rule about what's healthy for a system, but anything over 1 should be 
> investigated, as it can mean buggy software hasn't terminated properly, and is 
> running wild.
> 
> In the past I have integrated the CPU load average with MRTG (by multiplying it 
> by 100), which shows very nicely the long term trends for system usage.
> 
> *********************************
>         Paul Gillingwater
>         Managing Director
>  CSO Lanifex Unternehmensberatung 
>  & Softwareentwicklung G.m.b.H.
>       NEW BUSINESS CONCEPTS
> 
> E-mail:  paul@xxxxxxxxxxx
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#!/usr/bin/perl

print "Have Clue Will Travel";
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