Re: New Memory Manager
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%
>
>
>
>
>
>
>
> *PHP-5.6 64-bit* zend_alloc xx_malloc Improvement blog 99.0 102.3 3.33% drupal
> 1531.1 1604.2 4.78% fw 197.6 206.5 4.50% hello 11702.0 11875.2 1.48% qdig
> 451.1 476.8 5.70% typo3 541.8 568.7 4.96% wordpress 176.5 185.8 5.27% xoops
> 126.1 134.5 6.66% scrum 169.3 174.9 3.31% ZF1 Hello 1042.9 1119.6 7.35% ZF2
> Test 238.4 242.5 1.72%
>
I tested your patch on some parsing code (which is very heavy on object
creation for syntax trees) and saw ~12% performance improvement and ~15%
memory usage improvement there. So looks like the new allocator works
particularly well if a lot of object allocation is involved.
Nikita
Thread (14 messages)