8GB RAM CENTOS6.2 服务器，memcached分配多少合理？
有一个服务器，8GB RAM 安装CENTOS6.2系统，
top一下内存信息，
mysql支持全文搜索，占掉大概1.5GB左右，
每个root（php）进程16-18MB，
每个apache（httpd）进程18-60MB（大部分在45MB）
每秒有17个cron程序需要运行，
同时通过google analytics观察，每秒峰值最高时可达20page流量。（日4.3W PG量）
现在服务器速度下降，想安装memcached。
求教前辈们，像我的这种情况，可以分配多少GB内存给memcached？
此外，本服务器最主要的任务都是通过mysql全文搜索（实时信息），memcached缓存时间设置多少合理？
谢谢。
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