Re: New Memory Manager

Of course I tried to plug jemalloc and tcmalloc but they make slowdown instead of speedup, mainly because zend_alloc was especially designed for PHP and also because they suffer from multi-threading support overhead. On the other hand profiling PHP with oprofile I saw a lot of cache misses in zend_alloc.c, especially because of linked list handling. So I tried to combine the best from all approaches and then spend a couple of week tuning it. Thanks. Dmitry. On Tue, Jan 14, 2014 at 6:50 PM, Julien Pauli <jpauli@php.net> wrote: > 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 >