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cpu utilization

Linux Limit CPU Usage Per Process

I don't want background process to eat all my CPU. I know how to find out CPU utilization but how do I limit the cpu usage of a process under Linux operating system? How do I force a process to limit itself to 25% only?
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FreeBSD: Apache httpready filter – Failed to enable the 'httpready' Accept Filter

Q. I've installed Apache 2.2 from FreeBSD 7.0 ports and when I try to start I get following warning on screen:

Performing sanity check on apache22 configuration:
Syntax OK
Starting apache22.
[Wed Sep 17 22:01:58 2008] [warn] (2)No such file or directory: Failed to enable the 'httpready' Accept Filter

How do I fix this error?
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OpenVZ Virtual Machine (VPS) Management

Now, my VPS is up and running. How do I manage my hardware node and VPS? How do I see a list of all running VPSes? How do I see memory usage and other stuff?
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Linux Performance Tools To Troubleshoot Problems

Q. I am new to Linux. What tools or commands are recommended to troubleshoot performance related problems?
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