python / python/cpython

Add jump table for certain safe match-case statements

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3.12 interpreter-core performance
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Python
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描述

BPO 44283
Nosy @rhettinger, @markshannon, @serhiy-storchaka, @corona10, @brandtbucher, @sweeneyde, @AndersMunch, @Fidget-Spinner, @Kshitiz-Arya
PRs
  • python/cpython#26697
  • Files
  • matchperf.py
  • 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 = None
    created_at = <Date 2021-06-01.21:58:12.002>
    labels = ['interpreter-core', '3.11', 'performance']
    title = 'Add jump table for certain safe match-case statements'
    updated_at = <Date 2021-06-14.17:02:35.709>
    user = 'https://github.com/sweeneyde'
    

    bugs.python.org fields:

    activity = <Date 2021-06-14.17:02:35.709>
    actor = 'brandtbucher'
    assignee = 'none'
    closed = False
    closed_date = None
    closer = None
    components = ['Interpreter Core']
    creation = <Date 2021-06-01.21:58:12.002>
    creator = 'Dennis Sweeney'
    dependencies = []
    files = ['50106']
    hgrepos = []
    issue_num = 44283
    keywords = ['patch']
    message_count = 20.0
    messages = ['394874', '394878', '394882', '394884', '394887', '394889', '394891', '394892', '394975', '394977', '395019', '395069', '395265', '395278', '395717', '395732', '395738', '395797', '395809', '395813']
    nosy_count = 9.0
    nosy_names = ['rhettinger', 'Mark.Shannon', 'serhiy.storchaka', 'corona10', 'brandtbucher', 'Dennis Sweeney', 'AndersMunch', 'kj', 'Kshitiz17']
    pr_nums = ['26697']
    priority = 'normal'
    resolution = None
    stage = 'patch review'
    status = 'open'
    superseder = None
    type = 'performance'
    url = 'https://bugs.python.org/issue44283'
    versions = ['Python 3.11']
    

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    1. 先读完整个 Issue,再读项目的贡献指南。
    2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
    3. Fork 仓库,在一个分支上完成修改。
    4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

    调研方向

    首先审查现有的 pull request python/cpython#26697 以及其中引用的基准测试 matchperf.py。确定哪些安全的 match-case 语句属于范围,并确定应如何评估 jump-table 变更;当目标案例使用预期的优化,且相关的性能行为得到验证时,工作即告完成。

    由索引模型根据 Issue 内容生成。

    评估

    技术栈
    python
    领域
    compilers, performance
    Issue 类型
    功能
    难度
    5/5
    预计耗时
    一周以上
    活跃度
    停滞
    描述清晰度
    需要澄清
    新手友好度
    20/100

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