The test site is bottlenecked on database I/O for short periods of time following each partial invalidation event, but recovers quickly.
2
通知可用于无效的缓存对象,或者在对象被添加、替换以及移除时指定事件处理器。
Notifications can be used to invalidate cached objects or to specify event handlers when objects are added to, replaced, or removed from the cache. Performance improvements.
3
对一个已经设置为有信号状态的事件对象再次执行该函数是无效的。
Setting an already-set event object has no effect .