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regexp performance degradation between 2.7.6 and 2.7.12 #72085

Description

@stevenewcomb
BPO 27898
Nosy @rhettinger, @gpshead, @vstinner, @serhiy-storchaka
Files
  • profiles_2.7.6_vs_2.7.12: profiles of processing same data with same Python code on 2.7.6 and 2.7.12.
  • newcomb_profile_report_for_2.7.6.txt
  • newcomb_profile_report_for_2.7.12.txt
  • test.py
  • test_output_2.7.6.txt
  • p17-188.htm
  • test_output_2.7.12.txt
  • Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
    closed_at = <Date 2020-10-20.01:29:48.606>
    created_at = <Date 2016-08-30.16:27:50.668>
    labels = ['performance']
    title = 'regexp performance degradation between 2.7.6 and 2.7.12'
    updated_at = <Date 2020-10-20.01:29:48.603>
    user = 'https://bugs.python.org/stevenewcomb'

    bugs.python.org fields:

    activity = <Date 2020-10-20.01:29:48.603>
    actor = 'gregory.p.smith'
    assignee = 'none'
    closed = True
    closed_date = <Date 2020-10-20.01:29:48.606>
    closer = 'gregory.p.smith'
    components = []
    creation = <Date 2016-08-30.16:27:50.668>
    creator = 'steve.newcomb'
    dependencies = []
    files = ['44277', '44301', '44302', '44335', '44336', '44337', '44338']
    hgrepos = []
    issue_num = 27898
    keywords = []
    message_count = 10.0
    messages = ['273932', '273935', '273940', '273946', '273951', '274029', '274182', '274183', '274189', '379073']
    nosy_count = 5.0
    nosy_names = ['rhettinger', 'gregory.p.smith', 'vstinner', 'steve.newcomb', 'serhiy.storchaka']
    pr_nums = []
    priority = 'normal'
    resolution = 'wont fix'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = 'performance'
    url = 'https://bugs.python.org/issue27898'
    versions = []

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