[jnwatson]

Keep in mind that’s from Python 2.5. Modern Python uses arenas that always use mmap.

[lbolla]

I developed that tweak for Python 2.7 and I am running in production with Python 3.6. I tested with later Python versions, too.

Do you have some pointers about arenas always using mmap? I'd like to know how that trick can work if that was the case.

[cmeacham98]

It doesn't work, that's their point. With modern python versions those env variables do next to nothing. It won't crash your python but it also won't help you.

[lbolla]

My point is that it does work. I tested with Python 2.7 and Python 3.6+.