APC extension for installing PHP in Windows

APC overview APC (AlternativePHPCache) is a PHP Cache. It stores PHP pages in memory and reduces hard disk I/O. This significantly improves the performance. You can even increase the system performance by 50% when the CPU usage drops by 50%. This tutorial we... "> <LINKhref =" http://www.php100.com

About APC

APC (Alternative PHP Cache) is a PHP Cache. It stores PHP pages in memory and reduces hard disk I/O. This significantly improves the performance. You can even increase the system performance by 50% when the CPU usage drops by 50%.

This tutorial will show you how to install APC on windows. I have successfully tested windows server 2003. Of course, you can also use windows xp as a test server.

APC extension for installing PHP in windows

Note: you cannot install APC and Zend Optimiser on a single-day Server. either of them is required.

Follow the steps below to install APC extension for PHP.

Download the correct version

The PHP version I used is 5.2.6, attached with: php_apc_dll for php5_2_6

Note: Make sure that the expanded APC version you downloaded corresponds to your PHP version.

Set php. ini

Edit the php. ini file and add the following code to the expanded area section:

Extension = php_apc.dll

Restart the server and use phpinfo to check whether the installation is successful.

Phpinfo ();

Phpinfo: Check whether apc expansion is successfully installed

View available memory

Create a php file apcmeminfo. php

Print_r (apc_sma_info ());

// This formula is used to calculate the amount of memory used by the cache:

Total_memory = apc. shm_segments * apc. shm_size

In this example, the available memory is about 32 Mb. Generally, if we need to exceed 32 Mb in our cache, we should increase the number of segments used by APC. However, this can cause web server errors, so it is best to increase the size of the fragments. We should gradually increase the total amount of available cache to avoid memory loss.

The default APC is as follows:

Apc. cache_by_default = On

Apc. enable_cli = Off

Apc. enabled = On

Apc. file_update_protection = 2

Apc. filters =

Apc. gc_ttl = 3600

Apc. include_once_override = Off

Apc. max_file_size = 1 M

Apc. num_files_hint = 1000

Apc. optimization = Off

Apc. report_autofilter = Off

Apc. shm_segments = 1

Apc. shm_size = 30

Apc. slam_defense = 0

Apc. stat = On

Apc. ttl = 0

Apc. user_entries_hint = 100

Apc. user_ttl = 0

Apc. write_lock = On

For more information about the complete APC parameter settings, see http://www.php.net/apc.

The following is an APC block in php. ini. Paste them into your php. ini file:

Apc. enabled = 1

Apc. shm_segments = 1

Apc. shm_size = 64

Apc. max_file_size = 10 M

Apc. stat = 1

The default value is used for other settings.

Set temporary directory

APC requires a temporary directory to store files. It will try to cache files in the temporary directory of windows. please grant the write permission to the temporary directory in advance.

Monitoring and cache optimization

Monitor and optimize apc cache

The APC source contains a php script that is useful for monitoring and tuning the cache performance.

1, download APC monitoring File: http://pecl.php.net/package/apc

2. the apc. php file in the compressed package displays the APC monitoring information.

3. run this file and you will see a graph showing your cache statistics.

4. tune the Cache and view General Cache Information and Detailed Memory Usage and Fragmentation sections (overall Cache Information and Detailed Memory Usage and Fragmentation ).

5. monitor the Cache Full Count and fragment percentage. if the Cache Full Count is greater than 0, the Cache is Full and read/write frequently because there is not enough memory to be allocated. Increase apc. shm_size to solve the problem.

6. the fragment percentage should be 0%, but the value will increase as the memory reads and writes frequently.

Apc. php Security

Note the security of apc. php. you should use the security authentication method to control the information output of apc. php. for example:

// Moodle user Authentication

Require_once ("../config. php ");

Require_once ($ CFG ---> libdir. '/adminlib. php ');

Require_login ();

Require_capability ('moodle/site: config', get_context_instance (CONTEXT_SYSTEM, SITEID ));

// Disable APC Auth (APC Security authentication)

ULTS ('use _ AUTHENTICATION ', 0 );

//....