How to determine cpu, ram needed for rails app?

Posted by Ben on Stack Overflow See other posts from Stack Overflow or by Ben
Published on 2010-03-18T22:46:50Z Indexed on 2010/03/18 22:51 UTC
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ruby-on-rails

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passenger

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phusion-passenger

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Performance

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load

What is the most accurate way to determine the amount of cpu speed and ram needed to run my rails app?

I believe there are stress testing tools like Tsung, but how do I determine, for example, that I need X more ram, or X more CPU? I would like to find some way to roughly gauge the performance needs of my application so I can anticipate future needs. I think this data will also be useful for me to decide whether to upgrade one machine, or get another dedicated machine and put all the databases on that one.

Essentially, I am concerned about scaling issues, and how to anticipate them. Thanks in advance for the help!

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