Language Selection

English French German Italian Portuguese Spanish

Linux: CFS And Nice

Filed under
Linux

The recently merged Completely Fair Scheduler changes how the Linux kernel handles scheduling priorities set with the nice command. Ingo Molnar explained that each level of nice adds or substracts 10% of CPU utilization, "the '10% effect' is relative and cumulative: from _any_ nice level, if you go up 1 level, it's -10% CPU usage, if you go down 1 level it's +10% CPU usage." Ingo noted that with the earlier scheduler the nice level was tied to the HZ, offering three examples in which HZ is set to 100, 250, and 300, "a nice +19 task (the most commonly used nice level in practice) gets 9.1%, 3.9%, 3.1% of CPU time on the old scheduler, depending on the value of HZ. This is quite inconsistent and illogical. This HZ dependency of nice levels existed for many years, and the new scheduler solves that inconsistency - every nice level will get the same amount of time, regardless of HZ."

More Here.




More in Tux Machines

Mozilla involves the community in its “open-source” rebrand

Mozilla is bending the terms of the rebrand with a “branding without walls” open-source initiative. Read more

RPi 3 add-on loads up on sensors, wireless radios

Matrix Labs’s FPGA-driven “Matrix Creator” IoT daughter board for the Raspberry Pi 3 is loaded with sensors, 802.15.4 radios, and a mic array. The disc-shaped Matrix Creator add-on for the Raspberry Pi is based on AdMobilize’s successfully Kickstartered Matrix home automation and surveillance hub. AdMobilize spun off Matrix Labs, which has now built this cheaper, board-level version of the product. Read more

Canonical Releases Snapcraft 2.12 Snaps Creator with New Parts Ecosystem, More

Today, June 29, 2016, Canonical has had the great pleasure of announcing the release of the highly anticipated Snapcraft 2.12 Snappy creator tool for the Ubuntu Linux operating system. Read more

AMDGPU-PRO Driver 16.30 Officially Released with Support for Ubuntu 16.04 LTS

Today, June 29, 2016, AMD released the final version of the AMDGPU-Pro 16.30 graphics driver for GNU/Linux operating systems, bringing support for new technologies like the Vulkan API. Read more