How to maximize performance with 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 maximize its performance, I There are still a few things I would like to remind you.

PHP7 VS PHP5.6

1. Opcache

Remember to enable Zend Opcache, because even if PHP7 does not Enabling Opcache is also faster than enabling Opcache in PHP-5.6, so during the previous testing period, someone did not enable Opcache. Enabling Opcache is very simple, just add:

zend_extension= in the php.ini configuration file opcache.so

opcache.enable=1

opcache.enable_cli=1"

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

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 version 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, through :

$sudo sysctl vm.nr_hugepages=512

Allocate 512 reserved huge page memory:

$ 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:

opcache.huge_code_pages=1

In this way, PHP will store its own text segment and the memory allocation Huges are stored in large memory pages to reduce TLB misses and thereby improve performance.

4. Opcache file cache

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

Add in php.ini:

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

My previous article: Make your PHP7 faster (GCC PGO) also introduced that if your PHP is specifically for one project, such as just for your WordPress, or drupal, or something else, then you You can try to use PGO to improve PHP, specifically to improve the performance of your project.

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

$ make prof-gen

Then use your project to train PHP, for example for WordPress:

$ 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.

Recommended tutorial: "

PHP7"

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