New submission from Louie Lu:
There is a XXX in v3.5.0 shows that need to dealing with deque maxlen setting
case in deque_repeat.
Although there have common case for deque size 1 with maxlen, other size of
deque with maxlen still using for-loop to extend the deque, without any
detection.
Adding this fast break will reduce the execution speed when repeat deque with
maxlen.
---
$ cat tests.py
from collections import deque
for _ in range(10:
d = deque(maxlen=100_000)
d.insert(0, 0)
d.insert(0, 10)
d * 10_000_000
$ time ./python_with_patch tests.py
$ time ./python tests.py
----------
components: Extension Modules
messages: 288460
nosy: louielu
priority: normal
severity: normal
status: open
title: Reduce deque repeat execution when maxlen exist and size is not 1
type: enhancement
versions: Python 3.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue29634>
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