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I know it is a vague and ambiguous question.

I want to know just out of curiosity. How many instances of a rails app can I host on server with 256 MB RAM [Cheapest option on Rackspace]?

Assumptions - The app is very simple with 100-200 CRUD operations/day. - Database server is on a separate server.

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How much RAM does one instance take? What are the VSIZE/RSS figures in top? – Jason Jun 27 '10 at 13:43
I mean, what are the figures after your 1 instance has started up, and has serviced at least 1 typical request? – Jason Jun 27 '10 at 14:18

I would say one or two.

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