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Optimize keytablelist implementation #2768

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Optimize keytablelist implementation #2768

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MJY-HUST
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What problem does this PR solve?

Issue Number: #2756

Problem Summary:

  • 设置thread_local的keytable_list长度上限为KEY_TABLE_LIST_SIZE = 10000
  • 超出KEY_TABLE_LIST_SIZE 后，返回KEY_TABLE_LIST_SIZE / 2 个 keytable给全局的free_keytables
  • 当前thread的keytable_list为空但是free_keytables不为空时，一次性从free_keytables中取出至多BORROW_FROM_GLOBLE_SIZE = 100 个keytable给keytable_list

What is changed and the side effects?

Changed:

Side effects:

  • Performance effects(性能影响):

  • Breaking backward compatibility(向后兼容性):

Check List:

  • Please make sure your changes are compilable(请确保你的更改可以通过编译).
  • When providing us with a new feature, it is best to add related tests(如果你向我们增加一个新的功能, 请添加相关测试).
  • Please follow Contributor Covenant Code of Conduct.(请遵循贡献者准则).

wwbmmm
wwbmmm reviewed Sep 21, 2024
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wwbmmm commented Sep 21, 2024

补充一些单测吧，感觉现有的单测没有覆盖到新增的代码

chenBright
chenBright reviewed Sep 22, 2024
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缩进改成4个空格吧

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MJY-HUST commented Sep 25, 2024 •
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补充一些单测吧，感觉现有的单测没有覆盖到新增的代码

补充了两个单测：
场景一：启动多个bthread，获取keytable后bthread_usleep，模拟issue中的场景
场景二：启动多个bthread，一组bthread直接调用borrow_keytable获取keytable并存放到全局链表，另一组从全局链表中获取keytable并return_keytable，这些bthread理论上都不会发生切换，来模拟keytable不均衡的场景。
两个场景均检查thread local list的长度小于bthread::FLAGS_key_table_list_size

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缩进改成4个空格吧

已修改

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wwbmmm commented Sep 26, 2024

LGTM

chenBright
chenBright reviewed Sep 26, 2024
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chenBright approved these changes Sep 27, 2024
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LGTM

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@MJY-HUST @wwbmmm @chenBright