Linux中，需要准确的项目进度。调度唤醒程序 [英] Linux, need accurate program timing. Scheduler wake up program

问题描述

我有一个Linux系统，我需要在精确的时间间隔为possbile执行上运行的线程。例如。执行每毫秒。

I have a thread running on a Linux system which i need to execute in as accurate intervals as possbile. E.g. execute once every ms.

目前，这是通过与创建一个计时器完成

Currently this is done by creating a timer with

 timerfd_create(CLOCK_MONOTONIC, 0)

，然后通过所需的睡眠时间在结构与

, and then passing the desired sleep time in a struct with

 timerfd_settime (fd, 0, &itval, NULL);

一个阻塞读取调用这个定时器，停止线程执行和报告失去了唤醒调用执行。

A blocking read call is performed on this timer which halts thread execution and reports lost wakeup calls.

的问题是，在更高的频率，在系统启动松动期限，即使CPU使用率在10％以下。我认为，这是由于调度无法唤醒线程往往不够检查阻塞调用。是否有一个命令，我可以用它来告诉调度为只要是possble醒来以一定的间隔线程？
忙等待是一个糟糕的选择，因为该系统处理很多其他任务。

The problem is that at higher frequencies, the system starts loosing deadlines, even though CPU usage is below 10%. I think this is due to the scheduler not waking the thread often enough to check the blocking call. Is there a command i can use to tell the scheduler to wake the thread at certain intervals as far as it is possble? Busy-waiting is a bad option since the system handles many other tasks.

感谢您。

推荐答案

您需要得到RT的Linux *，然后增加你想要定期唤醒进程的RT优先级。

You need to get RT linux*, and then increase the RT priority of the process that you want to wake up at regular intervals.

其他然后，我没有看到你的code的问题，如果你的过程中不被阻塞，它应该很好地工作。

Other then that, I do not see problems in your code, and if your process is not getting blocked, it should work fine.

（*）RT Linux的 - 与一些应用实时调度补丁的操作系统

(*) RT linux - an os with some real time scheduling patches applied.

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