How can I trace performance problems in an Ubuntu / Apache / MySQL / Rails + Passenger stack?

Question

I have performance issues with a Rails stack that is running Apache 2.2.9, MySQL 5.1, Passenger 2.2.9 and Rails 2.3.8 (ruby 1.8.7-p72) on an Ubuntu 8.04 server.

How can I trace performance issues in that stack?

Answer 1

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