An article explaining how to optimize and improve the performance of PHP7

PHP7 has been released. As the largest version upgrade and the largest performance upgrade of PHP in 10 years, PHP7 has shown obvious performance improvements in multiple tests. However, in order to make it work To get the maximum performance, I still have a few things to remind you.

1. Opcache

Remember to enable Zend Opcache, Because PHP7 is faster than PHP-5.6 even without Opcache enabled, some people did not enable Opcache during the previous testing period. Enabling Opcache is very simple. Just add:

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

to the php.ini configuration file.

2. Use a new 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 , this will bring about a performance improvement of about 5% (measured from the QPS perspective of Wordpres)

In fact, versions before GCC 4.8 also support it, but we found that it supports bugs, so it must be version 4.8 or above. This feature will be turned on.

3. HugePage

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

Take my CentOS 6.5 as an example, allocate 512 reserved huge page memory through:

$sudo sysctl vm.nr_hugepages=512

:

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

Then in php. ini:

The code is as follows:

 opcache.huge_code_pages=1

In this way, PHP will use large memory pages to save its own text segment and the huge in memory allocation, reducing TLB misses. Thereby improving performance.

4. Opcache file cache

Enable Opcache File Cache (experimental). By enabling this, we can let Opcache cache the opcode cache externally. file, for some scripts, there will be obvious performance improvements.
Add in php.ini:

The code is as follows:

opcache.file_cache=/tmp

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

5. PGO

My previous article: Make your PHP7 faster (GCC PGO) also introduced that if your PHP is specifically designed to serve a 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 project. The project improves performance.

Specifically, taking wordpress 4.1 as the optimization scenario.. First when compiling PHP:

The code is as follows:

$ make prof-gen

Then use your project Training PHP, for example, for WordPress:

The code is as follows:

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

That is, let php-cgi run 100 times on the WordPress homepage, thereby generating some profile information in the process.

Finally:

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

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

That’s all for now, I’ll think about it later Add, everyone is welcome to try, thanks

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