Mongodb memory usage too high

Time:2021-10-15

Official documentation on memory usage

https://docs.mongodb.com/v4.2…

Starting from mongodb 3.4, the maximum memory occupied is: (computer memory – 1 / 2)

Starting in MongoDB 3.4, the default WiredTiger internal cache size is the larger of either:

50% of (RAM – 1 GB), or
256 MB.

For example, my computer has 16g memory. Mongodb will occupy 7.5GB at most. It’s disgusting

The key is that using mongodump and mongorestore will also consume a lot of memory and will not release

Modify configuration

We can limit the memory size used by mongodb by modifying the configuration
https://docs.mongodb.com/v4.2…

Note that the level of the configuration item is: storage.wiredtiger.engineconfig.cachesizegb

storage:
  ... other configurations
  wiredTiger:
    engineConfig:
      cacheSizeGB: 3

Before the modification, I used mongorestore, and the memory occupied about 6G. After the modification, the memory occupied only 3G, which is effective in the personal test

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