nickva commented on issue #4988:
URL: https://github.com/apache/couchdb/issues/4988#issuecomment-1955460577
I don't typically run CouchDB in docker container so this all speculative
advice.
A few things to try perhaps:
* Try adjusting couchjs process numbers their number with
https://docs.couchdb.org/en/stable/config/query-servers.html#query_server_config/os_process_limit.
Make the hard limit say 75 and soft limit 25. The default is 100 I think.
* Try lowering
[max_dbs_open](https://docs.couchdb.org/en/stable/maintenance/performance.html#max-dbs-open).
The default is 500 so maybe try making it 400 or 300.
* When running in docker, Erlang VM doesn't always do a good job
auto-detecting the CPU quotas so start a scheduler thread for each core on the
host machine. So try lowering the number of schedulers artificially in
`vm.args` with `+S 4:4`, for example to use only 4 schedulers, that could help
with memory usage a bit as well.
* Erlang VM has more advanced memory management settings. I haven't tried
most of them. There is one to use a max amount of heap, so if you have a way to
test it out on a test cluster first, try something like:
vm.args
```
+MMscs 4096
+Musac false
+MMsco true
```
That sets the super-carrier to 4GB max. Again, I haven't tried running with
those settings but someone reported some success with that:
https://elixirforum.com/t/running-elixir-with-limited-heap-size/23633/13
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