[issue36139] release GIL on mmap dealloc

[Davide Rizzo]

Davide Rizzo <sorcio at gmail.com> added the comment:

Yes, this is mmap module. I found this to be slow for posix-shm-backed mmaps. Several milliseconds, like 20ms for a 128 MB object. Maybe the same can happen with private|anon mmaps? I will follow up with more numbers.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36139>
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