LAMP 网站给出错误  Warning: Unknown: Unable to allocate memory for pool. in Unknown on line 0

出现这个错误，一般是php开启了APC缓存模块，配置文件中分配给apc的内存太小导致的

[APC]

apc.enabled = 1

apc.shm_segments = 1

pc.shm_size = 32M 

apc.optimization = 1

apc.num_files_hint = 0

apc.ttl=7200

apc.user_ttl=7200

apc.gc_ttl = 3600

apc.cache_by_default = on

解决办法：修改apc.shm_size=64M或128M