All my elixir projects slowly run out of memory

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All my elixir projects slowly run out of memory.

Context
I have a couple of Elixir/Phoenix application with practically no load (5 visits per day).
This is a typical RAM usage for 2 days window. As you can see, it slowly rises to 1gb and then the instance dies. Before it dies the app is unavailable for some period, I presume because it can’t accept connections. Fly does not start another machine in this case and my app is simply unavailable without being under any load.

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image2286×1230 333 KB

This is memory usage at the time of writing along with observer results. Total ram used ≈134 MB, when grafana shows that my fly.io instance occupies 600MB.

> :erlang.memory()
[
  total: 140845712,
  processes: 50693280,
  processes_used: 50687608,
  system: 90152432,
  atom: 1884521,
  atom_used: 1874421,
  binary: 2459264,
  code: 52042526,
  ets: 9434816
]

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image2464×1492 493 KB

I am performing a number of tests, so I will extend this thread.

If you encountered this problem, please let me know what was the cause.

3

If you shell into the machine, and run free -h a few times over a few hours, do you see it eating memory? My first thought is that your Elixir application has a memory leak, and you’d need to deploy a cut-down version to find out where that leak is.

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