使用 systemd 每秒准确运行计时器

Question

如何精确地每秒运行一些服务？允许重叠。

这是我的 systemd 计时器单元：

[Unit]
Description=Send jobs every second

[Timer]
OnBootSec=1min
OnUnitActiveSec=1s
Unit=app.jobs-send.service

[Install]
WantedBy=multi-user.target

但app.jobs-send.service 服务并非每秒执行一次：

May 07 17:57:38 app.deployer.org systemd[1]: Started Send jobs to queue.
May 07 17:57:48 app.deployer.org systemd[1]: Starting Send jobs to queue...
May 07 17:57:48 app.deployer.org systemd[1]: Started Send jobs to queue.
May 07 17:57:58 app.deployer.org systemd[1]: Starting Send jobs to queue...
May 07 17:57:58 app.deployer.org systemd[1]: Started Send jobs to queue.
May 07 17:58:08 app.deployer.org systemd[1]: Starting Send jobs to queue...
May 07 17:58:08 app.deployer.org systemd[1]: Started Send jobs to queue.

大约有 17:57:58 - 17:57:48 = 10 秒的间隔。

如何每秒执行任务？

Answer 1

如man systemd.time 中所述，OnUnitActiveSec= 的准确性取决于AccuracySec= 设置，也记录在此。设置为AccuracySec=1us 以获得最佳分辨率。