Use vmstat to monitor your system memory and CPU

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http://www.go2linux.org – With today's big disks and extremely powerful CPUs out there, memory is probably the more expensive resource. When it comes to Virtual Hosts, also CPU power could be a problem, I have been running this site at Linode for a year now with no big problems, the only ones were because of some lack of memory, which caused the CPU usage to scale up, until I needed to restart the server. Because of that experience I was investigating about vmstat. you can read (HowTos)