Very interesting. So asynchronous I/O usually relies on specific kernel 
procedures, and only in few situations it's emulated using threads.

Il giorno giovedì 8 novembre 2012 00:05:39 UTC+1, Isaac Schlueter ha 
scritto:
>
> Node uses threads for file system IO and for some slow CPU-intensive 
> operations, and for system calls that are not available 
> asynchronously, and for spawning child processes (since you can't 
> actually do that without a fork call.) 
>
> It does *not* use threads for async network IO, because it's 
> unnecessary, and it certainly does not spawn a thread for each request 
> to an HTTP server, or for each outbound HTTP request it makes. 
>
>
> On Wed, Nov 7, 2012 at 2:27 PM, mscdex <msc...@gmail.com <javascript:>> 
> wrote: 
> > On Nov 7, 5:00 pm, Alberto Gori <forzaton...@gmail.com> wrote: 
> >> Am I wrong? 
> > 
> > The only place the thread pool in node is used (AFAIK) is for async 
> > file system calls. So, network I/O does not use extra threads as you 
> > suggest. There is one main thread where the event loop lives and where 
> > everything happens (except async file system calls as previously 
> > noted). 
> > 
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