最簡單的方法，找到php安裝目錄的pecl
自動安裝：
# /usr/local/php/bin/pecl install apc
下面按提示一步步完成即可
配置/etc/php.ini 末尾加入
extension=apc.so
手動安裝：
官網 http://cn2.php.net/manual/zh/book.apc.php
下載http://pecl.php.net/package/APC 找最新的
#wget http://pecl.php.net/get/APC-3.1.9.tgz
# tar -zxvf APC-3.1.9.tgz
# cd APC-3.1.9
# /usr/local/php/bin/phpize （生產configure文件）
# ./configure –enable-apc –enable-apc-mmap –with-php-config=/usr/local/php/bin/php-config
# make
# make install
拷貝添加SO文件
# cp /usr/local/lib/php/extensions/no-debug-zts-20060613/apc.so /usr/local/php/lib/php/extensions/apc.so
# chmod 755 /usr/local/php/lib/php/extensions/apc.so
修改PHP.INI使之啟動APC模塊
修改 php.ini下
extension_dir = “./”
extension_dir = “/usr/local/php/lib/php/extensions”
配置/etc/php.ini 末尾加入
extension=apc.so
apc.enabled = 1
apc.cache_by_default = on
apc.shm_segments = 1
apc.shm_size = 128
apc.ttl = 7200
apc.user_ttl = 7200
apc.num_files_hint = 1024
apc.write_lock = On
apc.gc_ttl=3600
apc.ttl=0
apc.mmap_file_mask=/tmp/apc.XXXXXX
重啟apache
#/usr/local/apache2/bin/apachectl restart
使用APC
<?php
print_r(apc_cache_info());
?>
注意 在浏覽器看會不是很友好，可以查看網頁源代碼就看到很清晰
Array
(
[num_slots] => 1031
[ttl] => 0
[num_hits] => 4
[num_misses] => 1
[num_inserts] => 1
[expunges] => 0
[start_time] => 1322818377
[mem_size] => 4240
[num_entries] => 1
[file_upload_progress] => 1
[memory_type] => mmap
[locking_type] => spin Locks
[cache_list] => Array
(
[0] => Array
(
[type] => file
[device] => 2049
[inode] => 883230
[filename] => /var/www/tb.php
[num_hits] => 4
[mtime] => 1322818340
[creation_time] => 1322818379
[deletion_time] => 0
[access_time] => 1322818482
[ref_count] => 1
[mem_size] => 4240
)
)
[deleted_list] => Array
(
)
[slot_distribution] => Array
(
... ...
多次點擊，可以發現num_hits在變化，說明緩存命中了！
壓力測試看效果：
怎麼壓力測試看之前的文章 http://blog.csdn.net/21aspnet/article/details/6595984
先看看關閉apc功能，在php.ini中配置
# ab -n1000 -c10 http://localhost/tb.php
這個時候吞吐率Requests per second 比沒用之前提高許多
