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Date: Mon, 23 May 2011 21:29:12 +0200
Message-ID: <BANLkTim3G7xRec6ef6+Hpwg8KFcVfDFstQ@mail.gmail.com>
To: Stas Malyshev <smalyshev@sugarcrm.com>
Cc: Drak <drak@zikula.org>, "internals@lists.php.net" <internals@lists.php.net>
Content-Type: text/plain; charset=UTF-8
Subject: Re: [PHP-DEV] call_user_func performance and dynamic code
From: hannes.magnusson@gmail.com (Hannes Magnusson)

On Mon, May 23, 2011 at 20:30, Stas Malyshev <smalyshev@sugarcrm.com> wrote:
> Hi!
>
>> I'd like to ask a question about call_user_func/_array performance and
>> the use of runtime variables to call functions and methods from the
>> PHP internals perspective.
>
> There are two separate issues here: real-life PHP application performance
> and internal engine performance. If you are interested in the former, please
> do not read the rest of the message, instead please read this:
>
> My experience (10+ years of working with PHP) shows that pretty much no
> application ever depends on its performance for such things. Most
> applications aren't even CPU-bound and those who are, their performance very
> rarely depends on how long it takes to make a function call, except for very
> small number of special cases. So unless your profiling of your specific
> application (not an artificial benchmark!) clearly shows this to be a
> problem - it does not matter.


Although you are correct when saying *most* apps, this shouldn't matter.
However. It matters a lot to f.e. applications reading large XML files
using XMLReader.
Take PhD as an example, I think we saved over a minute few years ago
when we profiled this.

Just pointing out that there are perfectly valid usecase to do give
this a thought :)

-Hannes