Bug report

Bug description:

queue.SimpleQueue (C level) uses a list on Python < 3.13^[1][2][3][4], a ring buffer on Python >= 3.13^[5][6]. However, it does not implement its own__sizeof__() method, and as a result, only the size of thesimplequeueobject structure itself (basicsize) is taken as the size of the object, while the size of the underlying structure is ignored.

>>>fromqueueimportSimpleQueue>>>q=SimpleQueue()>>>q.__sizeof__()72# 56 on Python < 3.13>>>for_inrange(1_000):...q.put(object())...>>>q.__sizeof__()72# 56 on Python < 3.13

Expected (should be, on Python >= 3.13):

>>>fromqueueimportSimpleQueue>>>q=SimpleQueue()>>>q.__sizeof__()136# == 72 + 8*8 == sizeof(simplequeueobject) + sizeof(PyObject *)*INITIAL_RING_BUF_CAPACITY>>>for_inrange(1_000):...q.put(object())...>>>q.__sizeof__()8264# == 72 + 8*1024 == sizeof(simplequeueobject) + sizeof(PyObject *)*pow(2, ceil(log2(1000)))

CPython versions tested on:

3.9, 3.10, 3.11, 3.12, 3.13, 3.14

Operating systems tested on:

Linux

Linked PRs

• gh-140025: fix queue.SimpleQueue.__sizeof__() computation #140086
• gh-140025: Fixqueue.SimpleQueue.__sizeof__() #143137
• gh-140025: Fix queue.SimpleQueue.__sizeof__() to account for buffer #143277