XHProf is a PHP profiling tool that was develop by and for Facebook. It's fast and very efficient. It has a small footprint and can be used in production environments.centos
I had problem with running capistrano after I switched to RVM (ruby version manager) on Centos 5. It was complaining about missing support of OpenSSL.centos ruby gems
Centos 5 are pretty restrictive when it comes to adding new packages into the repositories. So at times you have to circumvent the yum's and do the builds yourself. That is if you rely on the packages you download and compile.centos capistrano
We have had some problems installing capistrano on our centos 5 virtual machines.