mongoDB 禁用大内存页面 transparent_hugepage=never

mongo warning:

2016-09-05T10:55:13.241+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.

2016-09-05T10:55:13.241+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'

2016-09-05T10:55:13.241+0800 I CONTROL  [initandlisten] 

2016-09-05T10:55:13.241+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.

2016-09-05T10:55:13.241+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'

如果在运行时解决这问题，也不困难，只需要修改hugepage的设置就可以了。执行下面两条命令

echo never >> /sys/kernel/mm/transparent_hugepage/enabled

echo never >> /sys/kernel/mm/transparent_hugepage/defrag

别忘了重启你的mongoDB，这条warning就消失了。不过下次重新启动系统，这些设置就会消失。