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Episode 526

Completely Fair Scheduler
Thu, 2018-Oct-11 01:38 UTC
Length - 2:28

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Welcome to popular Wiki of the Day where we read the summary of a popular Wikipedia page every day.

With 346,554 views on Wednesday, 10 October 2018 our article of the day is Completely Fair Scheduler.

The Completely Fair Scheduler (CFS) is a process scheduler which was merged into the 2.6.23 (October 2007) release of the Linux kernel and is the default scheduler. It handles CPU resource allocation for executing processes, and aims to maximize overall CPU utilization while also maximizing interactive performance.

Con Kolivas's work with scheduling, most significantly his implementation of "fair scheduling" named Rotating Staircase Deadline, inspired Ingo Molnár to develop his CFS, as a replacement for the earlier O(1) scheduler, crediting Kolivas in his announcement.In contrast to the previous O(1) scheduler used in older Linux 2.6 kernels, the CFS scheduler implementation is not based on run queues. Instead, a red–black tree implements a "timeline" of future task execution. Additionally, the scheduler uses nanosecond granularity accounting, the atomic units by which an individual process' share of the CPU was allocated (thus making redundant the previous notion of timeslices). This precise knowledge also means that no specific heuristics are required to determine the interactivity of a process, for example.Like the old O(1) scheduler, CFS uses a concept called "sleeper fairness", which considers sleeping or waiting tasks equivalent to those on the runqueue. This means that interactive tasks which spend most of their time waiting for user input or other events get a comparable share of CPU time when they need it.

This recording reflects the Wikipedia text as of 01:38 UTC on Thursday, 11 October 2018.

For the full current version of the article, go to http://en.wikipedia.org/wiki/Completely_Fair_Scheduler.

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