'How to limit physical memory in python3?

I am trying to limit the memory usage of a python script, so it gets killed if it exceeds a threshold.

I tried using resource.setrlimit but the module seems to be limited.

resource.setrlimit(resource.RLIMIT_RSS,...) doesn't seem to work on newer Linux kernels.

resource.setrlimit(resource.RLIMIT_AS,...) works but it also counts virtual and shared memory, thus killing the process when it doesn't need to.

I need a solution that works directly in python, without using control groups or other tools.

Any way I might achieve this?

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