Angel has asked for the wisdom of the Perl Monks concerning the following question:

Dear Monks, I've been trying to figure out how to ask this question for a while and the discussion of making perl monks faster brought it to my fore front of my mind. Most of the experienced people I know simply say...write it and then see how long it takes to execute and then add more servers as needed. Is there any vague rules of thumb to figure out how to calculate server power prior ro development based on a series of questions or concepts?