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Date: Tue, 14 Jan 2014 15:50:24 +0100
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To: Dmitry Stogov <dmitry@zend.com>
Cc: PHP Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] New Memory Manager
From: jpauli@php.net (Julien Pauli)

On Tue, Jan 14, 2014 at 3:21 PM, Dmitry Stogov <dmitry@zend.com> wrote:
> Hi,
>
> Recently I took a look into jemalloc and tcmalloc internals and tried to
> borrow some ideas. You may check the result at
> https://github.com/dstogov/php-src/tree/xx_malloc. It's a dirty prove of
> concept implementation of New Memory Manager for PHP. It was tested only on
> Linux, release, non-ZTS build. It misses support for debug mode and ZTS
> yet. The main advantage is small but consistent speed improvement on
> real-life applications.
>
> I would appreciate if you bench it vs vanilla PHP-5.6 on your applications,
> review the code from performance and security points of views, and come
> with comments, ideas and criticism. (For example: may be someone would
> suggest how to avoid check for USE_ZEND_ALLOC=0 to allow system malloc()
> usage on each emalloc() call? How to reduce cost of statistics collection?)
>
> Currently, I'm not sure if 5% speed improvements costs the effort.
>
> The results of my benchmarks follow.
>
> Thanks. Dmitry.
>
>    *PHP-5.6 32-bit* zend_alloc xx_malloc Improvement  blog 105.6 109.7
> 3.88%  drupal
> 1625.0 1667.6 2.62%  fw 231.6 286.4 23.66%  hello 12048.4 11865.9 -1.51%  qdig
> 464.4 495.3 6.65%  typo3 563.8 584.9 3.74%  wordpress 188.9 196.8 4.19%  xoops
> 132.7 140.0 5.50%  scrum 181.6 192.7 6.11%  ZF1 Hello 1153.2 1228.4 6.52%  ZF2
> Test 263.0 275.5 4.75%

Great Dmitry !

We worked on something with Joe few months ago, mainly adding a new
ZendMM handler which binds jemalloc().

Anyway, I'm gonna try your code and run it against several Symfony2
applications.
I come back to you end of week with some results ;-)

Julien