Linux 内核使用哪些调度算法? [英] What scheduling algorithms does Linux kernel use?

问题描述

Linux 内核使用什么调度算法?

What scheduling algorithms does Linux kernel use?

我在哪里可以获得有关 linux 内核的更多信息?(操作系统第一门课程...学生级别)

Where can I get more info about linux's kernel? (OS first course... student level)

推荐答案

注意: 正如 Abdullah Shahin 所说，这个答案是关于 IO 队列调度程序，而不是进程.

Note: As Abdullah Shahin noted, this answer is about IO queing scheduler, not for processes.

如果您只想检查您的 linux 系统正在使用什么调度程序以及哪些可用，您可以运行以下命令:

If you just want to check what scheduler your linux system is using and which are available you can run the following command:

cat /sys/block/sda/queue/scheduler

[] 之间的那个是它目前正在使用的那个.其他的都可以.改变它:

The one between the [] is the one it's using at the moment. The other ones are available. To change it:

sudo bash -c 'echo deadline > /sys/block/sda/queue/scheduler'

但请小心将其设置回默认值，除非您知道自己在做什么和想要什么.

Be carefull to set it back to default though, unless you know what you are doing and want.

默认(至少在较新的 Ubuntu 发行版中)是 CFQ(完全公平调度):

Default (in newer Ubuntu distros at least) is CFQ (Completely Fair Scheduling):

http://en.wikipedia.org/wiki/CFQ

采访创作者 (Jens Axboe):

Interview with the creator (Jens Axboe):

http://kerneltrap.org/node/7637

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