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I have deployed a Mongo Community server docker in WSL Ubuntu and currently running MongoDB aggregate Query and downloading some data from Mongo. I set up the Mongo memory limit to 32 GB. However, after my query ran Mongo occupied around 22.4 GB. enter image description here

To fix this I added Mongo tcmallocReleaseRate as 9.0 in /etc/mongod.conf file.

setParameter:
  tcmallocReleaseRate: 9.0

However, still, my memory usage is very high enter image description here

This is adding a heavy load on our servers despite my mongo operation being finished. I am wondering how can I tell Mongo to free up this memory to system.

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    Did you configure the cache size in mongod.conf?
    – Joe
    Dec 12, 2023 at 19:13
  • @joe no do I need to? I was wondering it would use the memory when it needs to but free up later shouldn't this be the case? Dec 12, 2023 at 20:04
  • The mongod will hold on to 80% of the cache persistently, if left to its own defaults, it will set it cache size to about 50% of the amount of memory that the OS reports is there.
    – Joe
    Dec 12, 2023 at 20:28
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    Fred differently: what's the underlying problem that you're trying to solve here? Dec 12, 2023 at 20:55
  • @user20042973 basically when we do DB-intensive operations it crashes our whole DB, due to memory usage. Trying to resolve it Dec 13, 2023 at 6:02

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