PHP opcode cache: APC details

Preface

Compared with other compiled languages, the performance of PHP is not outstanding, but the performance improvement is obvious after the opcode cache is used. common examples include eaccelerator, xcache, and APC. This document mainly introduces the use of APC.

 

APC Introduction

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

APC Official Website: http://www.php.net/manual/en/book.apc.php

Windows under the latest version of: http://downloads.php.net/pierre/

Download link: The http://downloads.php.net/pierre/php_apc-3.1.4-5.3-VC6-x86.zip uses the corresponding DLL based on your PHP build

 

APC Configuration

APC configuration mainly describes the configuration in windows and the configuration in Linux.ArticleMany

1. Download php_apc.dll to the PHP ext directory.

2. Modify PHP. ini to add extension = php_apc.dll

Add configuration items at the end of PHP. ini

; APC setting
[APC]
; An error will be reported when stat is enabled.
; APC. Stat = 0
APC. Enabled = "1"
APC. shm_segments = "1"
The problem here is that the default memory configuration for Windows 7 is changed. Do you know if you have any problems?
; APC. shm_size = "128"
; APC. TTL = 7200
; APC. user_ttl = 7200
; Corrected metric data
APC. TTL = "300"
APC. user_ttl = "300"
APC. num_files_hint = "1024"
APC. mmap_file_mask = "E:/Wamp/tmp/APC. xxxxxx"
APC. enable_cli = "1"

3. Restart the Apache server and check whether the APC configuration item exists in phpinfo. If yes, the configuration is successful.

 

APC control panel, control files from APC-3.1.4.tgz

 

APC cache Performance Comparison

Before cache is used

After cache is used

 

FAQs:

1. What is the cache Clearing Problem for opcode under fcgi?