Where to start? Server profiling tools

Posted by Dave Chenell on Server Fault See other posts from Server Fault or by Dave Chenell
Published on 2012-04-12T03:09:28Z Indexed on 2012/04/12 5:33 UTC
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apache2

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mysql

So I have a website, users upload images, people view images etc. Simple enough. Lots of writes and reads everywhere. Its built in MySQL and PHP on Apache.

We have one dedicated server. Right now we are getting hammered with unexpected press and users and our CPU cycle is out of control, slowing down the entire site.

Off hand I am guessing its either the saving of the image to the disk, or the Mysql queries.

What tools can I use to educate myself on what is happening and pinpoint the problem? How can I find out what is happening in detail in this time of crisis?

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