[FASTCGI] Has anyone used multiplexed connections with FastCGI?

Preston L. Bannister preston at bannister.us
Sun Jan 31 22:05:25 EST 2010

Thanks, Darren. Was kind of afraid the answer might be similar to yours (few
or no servers), given that searching did not turn up any evidence. :)

Seems highly unlikely the Apache 1.x series (probably the biggest use of
FastCGI, early on) could have supported multiplexed connections. Given a
stable Apache module, and few/no FastCGI applications that can accept
multiplexed connections, there would no reason to put in work in that area
for Apache 2.x (even if feasible).

My interest is a little different, as I am looking at solving C10K class
problems. Can I build a massively scalable solution using server-side
Javascript (the Google V8 engine), no threads, and strict
non-blocking/asynchronous I/O? (Something like "node.js" but usable via
FastCGI.) Javascript interpreters are very strong on sandboxing (due to the
browser heritage), so keeping large numbers of per-request contexts is

I would guess that keeping down the number of connections (via multiplexing)
could be an advantage, for very large numbers of connections.

I have long  been interested in both single-threaded/non-blocking servers,
and in server-side Javascript.

Take this as an experiment. :)

The current code is at:

Don't bother looking, as it is far too early.

On Sun, Jan 31, 2010 at 6:10 PM, Darren Garvey <lists.drrngrvy at gmail.com>wrote:

> Hi Preston,
> On 31 January 2010 20:33, Preston L. Bannister <preston at bannister.us>wrote:
>> Does anyone use multiplexed connections with FastCGI?
> I don't know of any servers - free or commercial - which support
> multiplexed requests concurrently over a single connection.
> Are there frontends that support multiplexed connections (which I could get
>> from reading the sources, eventually), and do any work reliably (which may
>> be harder to determine)?
> <shameless_plug>
> I'm developing a (c++) FastCGI library that's "supposed" to support
> multiplexed connections, but I've never been able to test this aspect of it
> (ie. multiplexing) so can't claim to support it either completely or
> reliably. That said, I am currently rewriting the docs for this library and
> hope to wrap a release shortly, free-time permitting.
> </shameless_plug>
> (Started writing a FastCGI application, putting in support for multiplexed
>> connections, and wondering if this might be a bad idea.)
> Supporting multiplexing caused me some headaches with the unbuffered
> approach I took. I still wonder how much efficiency can be gained from
> supporting multiplexed connections and if it is worth it in the end. The
> Jury's out until there are some performance numbers against a
> multiplexing-enabled production server. I haven't found that supporting
> multiplexing causes any noticeable runtime overhead, but does add some
> complexity to the implementation because of multithreaded considerations.
> If you'd like to share your ideas / implementation, let me know (offline if
> you prefer).
> Cheers,
> Darren
> [1] If you are interested, code is available at
> https://svn.boost.org/trac/boost/browser/sandbox/SOC/2007/cgi/. Examples
> are in libs/cgi/example.
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