CPU usage on Linux

My proxy sites are getting some major traffic today, so much that it's crushing my server. I see the CPU usage listed at 168 at the moment and the sites on the server are almost not responding at all. What does the 168 CPU usage mean? I know its not % as in windows. I'm a real noob when it comes to Linux...

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Try the top command which will show % for CPU usage and more stats (processes, memory usage, swap file usage, etc.)

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top shows me a CPU usage of 94% and I see warnings about the temperature threshold being reached

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That may be a hardware problem. Contact your host to be sure on that.

As the site uses a cgi proxy it is common to have so much CPU usage. The only thing you can do to reduce that, is mod_perl but it is a little hard to install it....

There is something I have to do, because now the websites are not responding at all. And I thought I would be ok for a while with a INTEL P4 3.0GHz HT and 2GB of memory...

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You need to restart the server, and then check the apache error_log to see what happened. If there is no message there, then propably your server can't deal with the traffic, so you will have to find ways to optimize it (or upgrade)

What about the mod_perl? I can select an option 'mod_perl support' on my domains so I guess it is already installed on the server. After enabling it for the domains do I have to do anything else to make it work?

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What about the mod_perl? I can select an option 'mod_perl support' on my domains so I guess it is already installed on the server. After enabling it for the domains do I have to do anything else to make it work?

Yes you need to add some directives per domain to use mod_perl per script.

Here is an example :

Code:

<FilesMatch "\.((nph|n)-?)(pl|perl)">
        Options +ExecCGI
        SetHandler perl-script
        PerlSendHeader Off
        PerlHandler Apache::PerlRun
</FilesMatch>

Where do I do this? Like I said before I am a Linux noob 

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Where do I do this? Like I said before I am a Linux noob 

I'm using mod_perl with my plesk machine, but check this link for more information:

http://www.webhostgear.com/371.html

(check the info at the end to check if mod_perl is enabled)

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