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    <p>Generally speaking, Passenger spawns new processes by forking an ApplicationSpawner, which has the framework and application code pre-loaded into memory, or a FrameworkSpawner, which just has the framework code.</p> <p>Passenger, as far as I know, doesn't deal in threads. Instead, as the load increases on an application, it will fork that Application's ApplicationSpawner and initialize another instance. When load decreases, one or more application instances are killed off.</p> <p>If Passenger is configured in a certain way (I believe by choosing the "smart" spawn method), it will create a FrameworkSpawner, which loads the rails code, but no application code, which can then be forked to load and application using that version of Rails. </p> <p>So to answer your questions:</p> <ul> <li><p>It will serve them sequentially, then spawn additional processes if it decides the load is high enough.</p></li> <li><p>No. One process can only belong to a single Rails Application.</p></li> <li><p>I'm kind of sketchy on this one, but your experiment makes sense. Passenger should be smart enough to figure out that even though it's running from different places in the server config, you're talking about the same application. It's probably based on the application's filesystem path.</p></li> </ul> <p>EDIT: I went and read up on this a bit. Turns out I was mostly right, but the technical details were a bit off. See the <a href="http://www.modrails.com/documentation/Users%20guide%20Nginx.html#spawning_methods_explained" rel="noreferrer">Passenger documentation</a></p>
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