如何提高pthreads中的线程优先级? [英] How to increase thread priority in pthreads?

问题描述

我在 Linux 中使用 pthread.我想通过设置参数sched_pa​​ram.priority 来增加线程优先级.但是，我在网上找不到很多关于我可以设置的线程优先级范围的信息，或者关于线程优先级的描述.

I am using pthread in Linux. I would like to increase the thread priority by setting the parameters sched_param.priority. However, I could not find much info from the net regarding the range of the thread priority I could set, or about the description of the thread priority.

另外，我想知道相对线程优先级，因为我不想将线程优先级设置得太高而导致操作系统停止.有人可以帮我解决这个问题吗?

Also, I would like to know about the relative thread priority as I would not want to set the thread priority to be too high and resulting the OS to halt. Could someone help me with this?

推荐答案

默认的 Linux 调度策略是 SCHED_OTHER，它没有优先级选择，只有一个 nice 级别可以调整政策内.

The default Linux scheduling policy is SCHED_OTHER, which have no priority choice but a nice level to tweak inside the policy.

您必须使用函数pthread_setschedparam 更改为另一个调度策略(另请参阅man sched_setscheduler)

You'll have to change to another scheduling policy using function pthread_setschedparam (see also man sched_setscheduler)

正常"调度策略:(来自sched_setscheduler(2))

'Normal' scheduling policies: (from sched_setscheduler(2))

   SCHED_OTHER   the standard round-robin time-sharing policy;
   SCHED_BATCH   for "batch" style execution of processes; and
   SCHED_IDLE    for running very low priority background jobs.

实时调度策略:

   SCHED_FIFO    a first-in, first-out policy; and
   SCHED_RR      a round-robin policy.

在您的情况下，您可以使用 SCHED_BATCH，因为这不需要 root 权限.

In your case maybe you can use SCHED_BATCH as this does not require root privileges.

警告:错误地使用实时调度策略可能会使您的系统挂起.这就是为什么您需要 root 权限才能执行此类操作.

Warning: wrong usage of real-time scheduling policies may hang your system. That's why you need root privileges to do this kind of operation.

为了确定您的机器的功能，您可以使用 chrt 工具从util-linux 包.
例如:

Just to be sure of what your machine is capable of, you can use chrt tool from util-linux package.
As an example:

$ chrt -m 
SCHED_OTHER min/max priority    : 0/0
SCHED_FIFO min/max priority     : 1/99
SCHED_RR min/max priority       : 1/99
SCHED_BATCH min/max priority    : 0/0
SCHED_IDLE min/max priority     : 0/0

一种浪费时间的方法(我经常使用):

A way to waste less time (which I often use):

alias batchmake='time chrt --batch 0 make --silent'

在保留用户权限的同时，这将 make 推动了 15%(在我的情况下).

While staying with user privileges, this propels the make by 15% (in my case).

编辑:引入nice、SCHED_BATCH、SCHED_IDLE 和chrt 工具.为了准确！:)

introducing nice, SCHED_BATCH, SCHED_IDLE and chrt tool. For accuracy ! :)

这篇关于如何提高pthreads中的线程优先级?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！