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The optimization of string search can cause pessimization #69009

Closed
@serhiy-storchaka

Description

@serhiy-storchaka
BPO 24821
Nosy @pitrou, @vstinner, @ned-deily, @methane, @serhiy-storchaka, @animalize, @zhangyangyu, @mlouielu
PRs
  • bpo-24821: Fixed the slowing down to 25 times in the searching of some #505
  • Files
  • find_char.patch
  • find_char_false_positives.patch
  • 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 = 'https://github.com/serhiy-storchaka'
    closed_at = <Date 2017-03-30.06:21:11.700>
    created_at = <Date 2015-08-07.06:11:25.937>
    labels = ['interpreter-core', '3.7', 'performance']
    title = 'The optimization of string search can cause pessimization'
    updated_at = <Date 2017-03-30.06:21:11.699>
    user = 'https://github.com/serhiy-storchaka'

    bugs.python.org fields:

    activity = <Date 2017-03-30.06:21:11.699>
    actor = 'serhiy.storchaka'
    assignee = 'serhiy.storchaka'
    closed = True
    closed_date = <Date 2017-03-30.06:21:11.700>
    closer = 'serhiy.storchaka'
    components = ['Interpreter Core']
    creation = <Date 2015-08-07.06:11:25.937>
    creator = 'serhiy.storchaka'
    dependencies = []
    files = ['41035', '41040']
    hgrepos = []
    issue_num = 24821
    keywords = ['patch']
    message_count = 17.0
    messages = ['248179', '250410', '250419', '254627', '254653', '254659', '254661', '269020', '274614', '276001', '276005', '290772', '290774', '290775', '290779', '290781', '290819']
    nosy_count = 10.0
    nosy_names = ['pitrou', 'vstinner', 'ned.deily', 'methane', 'python-dev', 'serhiy.storchaka', 'malin', 'azsorkin', 'xiang.zhang', 'louielu']
    pr_nums = ['505']
    priority = 'low'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = 'performance'
    url = 'https://bugs.python.org/issue24821'
    versions = ['Python 3.7']

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    3.7 (EOL)end of lifeinterpreter-core(Objects, Python, Grammar, and Parser dirs)performancePerformance or resource usage

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