From: Brian Candler <lists@...>
Date: 2012-05-22T02:37:12+09:00
Subject: Re: Ruby through CGI and Rails

Shaun Lloyd wrote in post #1061455:
> I am trying to find information on why the cgi interface is obsolete and
> why everyone is using rails/rack etc. I actually really like rails but
> can't seem to find the details on why they don't simple run as cgi
> script. I have a shared cpanel managed domain and setting up rails apps
> is a piece of cake and in some ways the archecture of rails somehow
> makes ruby feel more like a application rather that connecting the dots
> with shtml.
>
> I understand the "cost" of forking process's server side, i also
> understand the security implications of having your own process!

The cost of starting a Rails app is huge - several seconds of startup 
time. You really really don't want to do this from scratch on every 
request.

> Does rails exec and sleep in memory but never die. Does each connected
> user "share" that process ?

Depends how you run it. The normal way is to have a pool of processes 
each of which is waiting for a HTTP request. It accepts and processes 
one HTTP request, sends the response, then goes back to waiting for 
another request.

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