PHP APC Cache

See official documentation

http://php.net/manual/en/book.apc.php

The alternative PHP cache (APC) is a free and open opcode cache for PHP. Its goal are to provide a free, open, and robust framework for caching and optimizing PHP intermediate code.

You can see if the APC extension is installed in the following ways

$ php -r  ' phpinfo (); '  |grep apcapcapc.cache_by_default => On => Onapc.canonicalize =>  On => Onapc.coredump_unmap => Off => Offapc.enable_cli =>  off => offapc.enabled => on => onapc.file_md5 => off  => Offapc.file_update_protection => 2 => 2apc.filters =>  No value => no valueapc.gc_ttl => 3600 => 3600apc.include_ once_override => off => offapc.lazy_classes => off =>  Offapc.lazy_functions => off => offapc.max_file_size => 1m =>  1Mapc.mmap_file_mask => no value => no valueapc.num_files_hint  => 1000 => 1000apc.preload_path => no value =>&nBsp;no valueapc.report_autofilter => off => offapc.rfc1867 => off  => offapc.rfc1867_freq => 0 => 0apc.rfc1867_name => apc_ upload_progress => apc_upload_progressapc.rfc1867_prefix => upload_ =>  upload_apc.rfc1867_ttl => 3600 => 3600apc.serializer => default = > defaultapc.shm_segments => 1 => 1apc.shm_size => 32m = > 32mapc.shm_strings_buffer => 4m => 4mapc.slam_defense => on  => Onapc.stat => On => Onapc.stat_ctime => Off =>  Offapc.ttl => 0 => 0apc.use_request_time => On =>  Onapc.user_entries_hint => 4096 => 4096apc.user_ttl => 0 =>  0apc.write_lock&nBsp;=> on => on 

1. Installing the APC Extension

TAR-ZXVF apc-3.1.14.tgz

CD APC-3.1.14

Phpize

./configure--with-php-config=/data/app_platform/php/bin/php-config

Make && make install

2. Configure PHP.ini

The following parameters are recommended for use

Extension=apc.so

Apc.enabled=1

apc.shm_size=128m

apc.ttl=7200

apc.user_ttl=7200

Apc.enable_cli=1

3. Configuring APC Parameters

Reference documents

http://php.net/manual/en/apc.configuration.php

There are two top questions to consider: 1. How much memory space is allocated to APC. 2. For each request, let APC check if a file has been changed. The two parameters are Apc.shm_size and Apc.stat.

APC comes with a monitoring page apc.php, you can copy apc.php from the source package to an Nginx virtual host, and then view the status of the APC cache through http://xxxxxx/apc.php.

If you install the GD extension of PHP, you can see the chart

Apc.shm_size

This article is from the Linux SA John blog, so be sure to keep this source http://john88wang.blog.51cto.com/2165294/1579158

PHP APC Cache