Thanks for replying.
Eviction does work when there’s cache pressure. But if eviction cannot keep up with the rate of collection being created and inserted (We once saw performance problem of eviction efficiency in mongo 4.0 production, that is, cache_used is hard to decrease even if we increase number of eviction worker), reducing close_idle_time will help sweep inactive pages, right ?
I suppose changing to 10min also applies to mongo 4.0 ? (For some reason we’re still using mongo 4.0.)