Give full play to the high performance of PHP7 and become a good salted fish

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A little PHP blog shares how to take advantage of the high performance in the PHP7 version, PHP7 has been released for some time, but there are still many friends who are still using PHP5.6 to develop projects. Some friends have used PHP7 only because they heard that it is a high-performance version, but they don’t know how to reflect the advantages of PHP7. Description Let me summarize an article about PHP7 and share it with you.

If you want to enable its high performance when using PHP7, you need to pay attention to the following points:

1. Opcache

Be sure to enable Zend Opcache, but even if this extension is not turned on, its performance and speed are much higher than PHP5.6. Enable Opcache mode and add:

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

in the php.ini configuration file 2. Use a new compiler

Use a newer compiler, GCC 4.8 or above is recommended , because only PHP with GCC 4.8 or above 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. However, we found that there is a bug in its support, so you must be version 4.8 or above to enable this feature.

　3. HugePage

Be sure to enable HugePages in the system and enable Opcache'shuge_code_pages, which can be done through the following code.

Taking my CentOS 6.5 as an example, allocate 512 reserved large page memory through:

　　$sudo sysctl vm.nr_hugepages=512

Finally, add in php.ini:

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

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

Turn on Opcache File Cache (experimental). By turning this on, we can let Opcache cache the opcode cache to an external file. For Some scripts will have significant performance improvements.

Add:

　　opcache.huge_code_pages=1

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

If your PHP is only used to run a unique project, such as just for your WordPress, or drupal, or something else, then You can try to improve PHP through PGO to improve performance specifically for your project.

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

　　opcache.file_cache=/tmp

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 to say, let php-cgi run the wordpress homepage 100 times to generate some profile information in the process, so that PHP can remember Live this information.

Finally:

　$ make prof-gen

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

From the basics to tp5 mall actual combat, laravel5.6 actual combat, swoole, payment interface development, redis, high concurrency and other intermediate and advanced learning

Wei X: xiaopingguo950321 Penguin number: 722584796

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