Learn how php7 achieves maximum performance

PHP7 has been released. As the largest version upgrade and the largest performance upgrade of PHP in 10 years, PHP7 has performed very well in multiple tests. There is an obvious performance improvement, however, in order to maximize its performance, I still want to remind you of a few things.

1. Opcache

Remember to enable Zend Opcache, because PHP7 even without Opcache enabled is faster than PHP-5.6 with Opcache enabled, so this happened during the previous test period Someone has never enabled Opcache. Enabling Opcache is very simple. Add

1. zend_extension=opcache.so
   opcache.enable=1
   opcache.enable_cli=1

to the php.ini configuration file. 2. Use new The compiler

Use a newer compiler, GCC 4.8 or above is recommended, because only GCC 4.8 or above PHP will enable Global Register for opline and execute_data support, which will bring about a 5% performance improvement (Wordpres Measured from the QPS perspective)

In fact, versions before GCC 4.8 also support it, but we found that there are bugs in its support, so this feature must be enabled in versions 4.8 or above.

3. HugePage

My previous article also introduced: Hugepage to make your PHP7 faster, first enable HugePages in the system, and then enable Opcache's huge_code_pages.

Take my CentOS 6.5 as an example , pass:

1. $sudo sysctl vm.nr_hugepages=512

Allocate 512 reserved huge page memory:

1. $ cat /proc/meminfo | grep Huge
   AnonHugePages: 106496 kB
   HugePages_Total: 512
   HugePages_Free: 504
   HugePages_Rsvd: 27
   HugePages_Surp: 0
   Hugepagesize: 2048 kB

Then add in php.ini:

1.  opcache.huge_code_pages=1

In this way, PHP will use large memory pages to save its own text segments and huge memory allocations to reduce TLB misses and improve performance.

4. Opcache file cache

Enable Opcache File Cache (experimental), by turning this on, we can let Opcache cache the opcode into an external file. For some scripts, there will be a significant performance improvement.
Add in php.ini:

1. opcache.file_cache=/tmp

In this way, PHP will cache some Opcode binary export files in the /tmp directory, which can exist across the PHP life cycle.

5. PGO

If your PHP is specifically for one project, such as just for your WordPress, or Drupal, or something else, then you can try to use PGO to improve PHP specifically for your This project improves performance.

Specifically, WordPress 4.1 is used as the optimization scenario. First, when compiling PHP:

1. $ make prof-gen

Then train PHP with your project, for example for WordPress:

1. $ sapi/cgi/php-cgi -T 100 /home/huixinchen/local/www/htdocs/wordpress/index.php >/dev/null

   That is to say, let php-cgi run the WordPress homepage 100 times to generate some profile information in the process.

Finally:

1. $ make prof-clean
   $ make prof-use && make install

   At this time The PHP7 you compile is the highest performance compiled version tailored for your project.

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