安装apc

wget http://pecl.php.net/get/APC-3.1.2.tgz
tar zxvf APC-3.1.2.tgz
cd APC-3.1.2/

apt-get install autoconf
/usr/local/php/bin/phpize
./configure --enable-apc --enable-apc-mmap --with-php-config=/usr/local/php/bin/php-config
make
make install

php.ini
查找extension_dir = "/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/"
下面添加extension = "apc.so"

配置php.ini 末尾加入
apc.enabled = 1
apc.cache_by_default = on
apc.shm_segments = 1
apc.shm_size = 32
apc.ttl = 600
apc.user_ttl = 600
apc.num_files_hint = 0
apc.write_lock = On