Python3.11 memory usage is more

[RasnaT]

Bug report

Bug description:

After upgrading to Python3.11.11 it is seen that most of the scripts are taking more memory compared to previous version 3.10.16.

is this a bug or expected behavior due to new adaptive interpreter?

Below is an example script run with redis and iproute, where ~4MB memory increase is seen.

python3 -m memory_profiler testmem.py
Running Python Version: 3.10.16 (main, Feb 20 2025, 10:49:09) [GCC 8.4.0]
Filename: testmem.py

Line # Mem usage Increment Occurrences Line Contents
 3     21.2 MiB     21.2 MiB           1   @profile
 4                                         def do_stuff():
 5     21.2 MiB      0.0 MiB           1       import sys
 6     21.2 MiB      0.0 MiB           1       python_version = sys.version
 7     21.2 MiB      0.0 MiB           1       print(f"Running Python Version: {python_version}")
 8     25.8 MiB      4.6 MiB           1       import redis
 9     35.6 MiB      9.8 MiB           1       import pyroute2

2:

python3 -m memory_profiler testmem.py
Running Python Version: 3.11.11 (main, Mar 12 2025, 15:15:10) [GCC 8.4.0]
Filename: testmem.py
Line # Mem usage Increment Occurrences Line Contents
 3     23.8 MiB     23.8 MiB           1   @profile
 4                                         def do_stuff():
 5     23.8 MiB      0.0 MiB           1       import sys
 6     23.8 MiB      0.0 MiB           1       python_version = sys.version
 7     23.8 MiB      0.0 MiB           1       print(f"Running Python Version: {python_version}")
 8     29.1 MiB      5.4 MiB           1       import redis
 9     40.0 MiB     10.9 MiB           1       import pyroute2

Redis version is 4.5.5
pyroute2 version is 0.7.5
OS:Linux controller 5.15.178

CPython versions tested on:

3.11

Operating systems tested on:

Linux

[ZeroIntensity]

Yeah, I don't think we have any guarantees about memory usage between versions, we care more about performance.

[terryjreedy]

In any case, 3.11 only gets security fixes