SOLVED: Simple swap question

Mel fbsd.questions at
Sun Dec 21 11:10:50 UTC 2008

On Friday 19 December 2008 19:04:26 FreeBSD wrote:

> This server is very lightly used, so most of the time if the swap is
> getting used it shows that something is going wrong. This warning
> already proved usefull once, so I don't think I'm going to change it.

Swapping is a symptom of a symptom - or just the machine doing it's job. 

Better let nagios monitor:
- fork rate by observing kern.lastpid sysctl over time
- nr. of processes running
- top 10 processes sorted by resident memory (res not size in top(1))

Those are the actual symptoms of something going wrong that can cause a system 
to start swapping heavily. 3MB swap is not 'heavily' and is nothing to worry 
about.In fact, a high fork rate can DOS a system pretty well, without the 
machine ever going into swap.

Problem with today's modular software: they start with the modules
    and never get to the software part.

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