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Date: Fri, 30 Aug 2013 16:46:26 -0700
To: Stas Malyshev <smalyshev@sugarcrm.com>
Cc: Leigh <leight@gmail.com>, Anthony Ferrara <ircmaxell@gmail.com>,
        "internals@lists.php.net" <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Re: [DRAFT] [RFC] Function autoloading
From: delong.j@fb.com (Jordan DeLong)

On Fri, Aug 30, 2013 at 03:21:47PM -0700, Stas Malyshev wrote:
> Hi!
> 
> > We got a performance win from exactly this at Facebook.  We have some
> > extensions in HHVM to autoload that allowed us to remove almost all
> > our *_once calls.
> 
> But autoloading does not remove require - you still have to load the
> files. Only thing that can be removed is a non-loading require. Is it
> that frequent that it had significant performance impact (given that
> with opcode caching non-loading require is pretty much a couple of hash
> lookups)?

For us it saved unnecessary loading requires due to transitive module
dependencies, as well.  I'd suspect it is unlikely to matter in nearly
the same way on smaller codebases, though.

-Jordan