一套复制集环境，数据量只有几百k，wt的配置是在9G左右（虚拟机的内存是16G），连接数平时也只有20~30个连接，最近发现上面的主节点的mongod的内存占用率比较高，当前一直占用在12G左右，进程的物理内存高水位去到13G。

Google Translate:

A set of replication set environment, the amount of data is only a few hundred k, the configuration of wt is around 9G (the memory of the virtual machine is 16G), and the number of connections is only 20~30 connections. Recently, the memory of the mongod of the master node above is found. The occupancy rate is relatively high, and it currently occupies about 12G. The physical memory of the process has a high water level to go to 13G.