为什么 Linux crond 不能原生支持秒级任务? - V2EX
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为什么 Linux crond 不能原生支持秒级任务?

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  •   Features Jul 27, 2022 1635 views
    This topic created in 1369 days ago, the information mentioned may be changed or developed.
    从接触到 Linux 就一直就感到很好奇
    我知道可以通过很多方法 hack
    但是如果能原生支持是不是就更美好了?
    5 replies    2022-07-28 11:55:19 +08:00
    Features
        1
    Features  
    OP
       Jul 27, 2022
    这么多年了,主流的发行版一直都没有改变过这个问题
    这个需求应该是很常见的吧?
    为什么厂家一直不改动呢?有什么历史包袱吗?
    antipro
        2
    antipro  
       Jul 28, 2022 via Android
    需求量不大吧
    sujin190
        3
    sujin190  
       Jul 28, 2022 via Android
    需求量不大秒级又很消耗资源自然没必要支持,crond 说白了还是做系统管理相关的任务调度,这种分钟级都极少了,用来管理业务需要只是偷懒顺带而已,非要这么干自然觉得别扭
    zbinlin
        4
    zbinlin  
       Jul 28, 2022
    systemd.timer 支持到 ns 呢
    codehz
        5
    codehz  
       Jul 28, 2022   1
    不是支持不支持的问题,是格式已经不能改了,cron 语法设计毫无扩展性,字段加哪里都不行
    * * * * * 后面跟命令行
    请问你秒打算加哪里?
    这显然不能随便动啊,楼上不是说了有 systemd 的 timer ,完全换一个格式就没有 cron 上打补丁的问题
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