Scaling

Hi,

I'm busy looking at options for deploying an rails app we are  
developing. I've set up apps before with a FastCgiServer line like

FastCgiServer /path/to/app/public/dispatch.fcgi -processes x

to preload a certain number of instances of the app. Does this  
actually limit the number of instances - or is it just a base line?  
If the number of instances increases further when under load, how  
much load does it take to increase the instances of rails apps.

Also is it possible to have multiple FastCgiServer lines, so that i  
can preload several instances of each application.

NB: The app is a little unusual since most of the time it will be  
dealing with a few requests a minute, then will shoot up to 20  
requests a second for an hour at a time (chatroom session).

Thanks

jebw

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