How many times can you spot the letter b in:
Q: How to make Swap work? CENTOS 5.7 Ive got a Centos 5.7 
running Magento with nginx.
I also got there 10GB of Swap.
But the os never use it. 
How can i make it work?

A: This article about swap from Tony Kay in the Linux Journal is the best Ive ever read on the subject: http://www.linuxjournal.com/article/10678
If youre interested to know the details of how swap space is used, you should give it a read.

A: Its not because you have swap it will automatically be used. It has been reported as a bug before on centos 6, but it was ruled as not a bug. You only need to be concerned when your memory is full, and your swap is not being used. At that point, as stated by qweet, you will have some bigger problems to worry about.
The OS knows when to use swap.

user
There are 18 "b"s.
assistant