php下免费的加速器，PHP Accelerator

http://php-accelerator.co.uk/ 可以下载，是zend的强劲对手。是免费的。我已经在用啦。效果还不错。
修改 php.ini 加上：
zend_extension = /u***local/lib/php_accelerator_1.3.3r2.so
phpa = on
ph***tweaks = on
ph***cache_dir = /tmp
ph***file_perms = 400
ph***cache_file_prune_period = 1h
ph***cache_file_ttl = 1d
ph***shm_size = 10
ph***shm_key = 0xc0deb00
ph***shm_perms = 666
ph***shm_user = nobody
ph***shm_group = nobody
ph***shm_release_at_exit = on
ph***shm_stats_check_period = 5m
ph***shm_ttl = 12h
ph***shm_max_processes = 512
ph***shm_lock_threshold0 = 10

apachectl graceful 就能用啦。具体参数看它的文档。