sum() several times slower on Python 3 64-bit

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
15/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
python
Domain
backend, performance

Research direction

Start by reviewing the referenced pylong_freelist.patch and unpack_single_digits.patch, then inspect pull requests #28469 and #28493. Compare the reported Python 3 64-bit sum() performance with the changes under discussion; done means the slowdown is addressed and the relevant performance behavior is verified.

Written by the indexing model from the issue text.

Description

interpreter-core performance type-feature
BPO 24076
Nosy @gvanrossum, @rhettinger, @mdickinson, @scoder, @stevendaprano, @ambv, @serhiy-storchaka, @pablogsal
PRs
  • python/cpython#28469
  • python/cpython#28493
    		•
    Files
  • pylong_freelist.patch
  • unpack_single_digits.patch
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

    Show more details

    GitHub fields:

    assignee = None
closed_at = <Date 2021-09-21.11:22:53.873>
created_at = <Date 2015-04-29.18:36:58.330>
labels = ['interpreter-core', '3.11', 'performance']
title = 'sum() several times slower on Python 3 64-bit'
updated_at = <Date 2021-09-22.10:30:16.952>
user = 'https://github.com/ambv'

    bugs.python.org fields:

    activity = <Date 2021-09-22.10:30:16.952>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2021-09-21.11:22:53.873>
closer = 'scoder'
components = ['Interpreter Core']
creation = <Date 2015-04-29.18:36:58.330>
creator = 'lukasz.langa'
dependencies = []
files = ['39245', '47748']
hgrepos = []
issue_num = 24076
keywords = ['patch']
message_count = 35.0
messages = ['242238', '242241', '242242', '242243', '242244', '242259', '242260', '242262', '242294', '242300', '242302', '242310', '242357', '242914', '323443', '402136', '402201', '402210', '402281', '402282', '402285', '402286', '402295', '402298', '402302', '402306', '402310', '402313', '402315', '402325', '402326', '402328', '402334', '402410', '402421']
nosy_count = 8.0
nosy_names = ['gvanrossum', 'rhettinger', 'mark.dickinson', 'scoder', 'steven.daprano', 'lukasz.langa', 'serhiy.storchaka', 'pablogsal']
pr_nums = ['28469', '28493']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue24076'
versions = ['Python 3.11']

    Dominant language
    Python
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