Processor scheduling algorithms

Gang scheduling

In computer science, gang scheduling is a scheduling algorithm for parallel systems that schedules related threads or processes to run simultaneously on different processors. Usually these will be threads all belonging to the same process, but they may also be from different processes, where the processes could have a producer-consumer relationship or come from the same MPI program. Gang scheduling is used to ensure that if two or more threads or processes communicate with each other, they will all be ready to communicate at the same time. If they were not gang-scheduled, then one could wait to send or receive a message to another while it is sleeping, and vice versa. When processors are over-subscribed and gang scheduling is not used within a group of processes or threads which communicate with each other, each communication event could suffer the overhead of a context switch. Gang scheduling is based on a data structure called the Ousterhout matrix. In this matrix each row represents a time slice, and each column a processor. The threads or processes of each job are packed into a single row of the matrix. During execution, coordinated context switching is performed across all nodes to switch from the processes in one row to those in the next row. Gang scheduling is stricter than coscheduling. It requires all threads of the same process to run concurrently, while coscheduling allows for fragments, which are sets of threads that do not run concurrently with the rest of the gang. Gang scheduling was implemented and used in production mode on several parallel machines, most notably the Connection Machine CM-5. (Wikipedia).

Video thumbnail

Introduction to Scheduling

This lesson introduces the topic of scheduling and define basic scheduling vocabulary. Site: http://mathispower4u.com

From playlist Scheduling

Video thumbnail

Scheduling: The List Processing Algorithm Part 1

This lesson explains and provides an example of the list processing algorithm to make a schedule given a priority list. Site: http://mathispower4u.com

From playlist Scheduling

Video thumbnail

Process Scheduling

An animation showing the main features of a process scheduling system including the ready queue, blocked queue, high level scheduler and low level scheduler. It explains the principle of a round robin scheduling algorithm.

From playlist Operating Systems

Video thumbnail

Into to the Mathematics of Scheduling

Terminology explained includes preference schedule, digraphs, tasks, arcs, processors, and timelines.

From playlist Discrete Math

Video thumbnail

Time Management Tutorial - Tips on scheduling meetings

Learn tips and best practices for scheduling a meeting. Explore more Time Management courses and advance your skills on LinkedIn Learning: https://www.linkedin.com/learning/topics/time-management-3?trk=sme-youtube_M140599-20-03_learning&src=yt-other This is an excerpt from "Time Managemen

From playlist Time Management

Video thumbnail

Scheduling: The List Processing Algorithm Part 2

This lesson explains and provides an example of the list processing algorithm to create a digraph and make a schedule. Site: http://mathispower4u.com

From playlist Scheduling

Video thumbnail

Queue Introduction

Related videos: Queue intro: https://youtu.be/KxzhEQ-zpDc Queue implementation: https://youtu.be/EoisnPvUkOA Queue code: https://youtu.be/HV-hpvuGaC4 Data Structures Source Code: https://github.com/williamfiset/algorithms My website: http://www.williamfiset.com

From playlist Queue data structure playlist

Video thumbnail

Scheduling: The Critical Path Algorithm Version 1 (Part 1)

This lesson explains how to create a priority list using version 1 of the critical path algorithm. Site: http://mathispower4u.com

From playlist Scheduling

Video thumbnail

Stanford Seminar - Instruction execution on the Mill CPU

"Instruction execution on the Mill CPU" -Ivan Godard, Out-of-the-Box Computing Colloquium on Computer Systems Seminar Series (EE380) presents the current research in design, implementation, analysis, and use of computer systems. Topics range from integrated circuits to operating systems

From playlist Engineering

Video thumbnail

Scheduling: The Decreasing Time Algorithm

This lesson explains how to use the decreasing time algorithm to create a priority list and then a schedule. Site: http://mathispower4u.com

From playlist Scheduling

Video thumbnail

America’s Most Daring Heists: Inside the FBI Files | Real Stories True Crime Marathon

4 back-to-back episodes of FBI Files. Season 4 Episode 6: In Arizona, a shipment of money vanished without a trace, along with the two men hired to guard it. Agents didn't know if the guards were willing participants or victims of an ambush. When the vehicle was recovered -- but with hundr

From playlist True Crime Stories

Video thumbnail

Policing London - The Fall of Jonathan Wild - Extra History - #2

Watch this video ad-free on Nebula: https://nebula.tv/videos/extra-history-policing-london-the-fall-of-jonathan-wild-extra-history-2 Jonathan Wild had the whole crime system figured out. A man of justice by day, and leader of a criminal empire by night. But that is when Jack Sheppard came

From playlist Extra History: Policing London

Video thumbnail

Cocaine Queens (Full Episode) | Trafficked with Mariana Van Zeller

Mariana investigates a new breed of narco starting to gain power in cocaine trafficking networks of Colombia and Brazil: las jefas, lady bosses. ➡ Subscribe: http://bit.ly/NatGeoSubscribe ➡ Get more Nat Geo Full Episodes: https://youtube.com/playlist?list=PLivjPDlt6ApSiD2mk9Ngp-5dZ9CDDn7

From playlist Full Episodes | National Geographic

Video thumbnail

The Kefauver Committee and Organized Crime

In 1950, freshman U.S. Senator Estes Kefauver took the stage against organized crime, at the head of a special committee. The Kefauver hearings, as they became known, were held in major cities across the country. The ones that were televised live became a sensation, and were how much of th

From playlist Extraordinary people and personalities

Video thumbnail

The Grimey Gangs of Manchester: From Victorian Era to Today (True Crime Documentary) | Real Stories

Gary and Martin Kemp visit Manchester to investigate a Victorian gang called the Scuttlers. They also look at the Gooches, who were active until only a few years ago. This documentary series explores the history of British gangsters, from their early criminal origins to today's modern und

From playlist Gangs of Britain

Video thumbnail

The Gang of Six in Control Theory | Control Systems in Practice

Check out the other videos in the series: Part 1 - What Does a Control Engineer Do? https://youtu.be/ApMz1-MK9IQ Part 2 - What Is Gain Scheduling? https://youtu.be/YiUjAV1bhKs Part 3 - What Is Feedforward Control? https://youtu.be/FW_ay7K4jPE Part 4 - Why Time Delay Matters https://youtu.b

From playlist Control Systems in Practice

Video thumbnail

America’s Dumbest Heist | Real Stories True Crime Documentary

Expanded two-hour true crime story about the 1997 Loomis-Fargo armored car heist in North Carolina and the serio-comic fate of its bumbling underdog perpetrators who fell victim to avarice, mutual betrayals, and false romantic promises. Facebook - https://www.facebook.com/RealStoriesChann

From playlist Crime Documentaries

Video thumbnail

What If The Moon Disappeared?

Without the moon, how would Earth's environment be affected? Would we survive? Learn more at HowStuffWorks.com: http://science.howstuffworks.com/no-moon.htm Share on Facebook: http://goo.gl/4yhFKp Share on Twitter: http://goo.gl/w1HQqE Subscribe: http://goo.gl/ZYI7Gt Visit our site: http

From playlist Stuff About Space

Video thumbnail

Gangs Of Britain: Liverpool (Gang Culture Documentary) | Real Stories

A historical look at Britain's most notorious gangs; this time in Liverpool, with a focus on the infamous Cornerman. Want to watch more full-length Documentaries? Click here: http://bit.ly/1GOzpIu Follow us on Twitter for more - https://twitter.com/realstoriesdocs Instagram - @realstori

From playlist Crime Documentaries

Video thumbnail

What is Job Scheduling | Error Hamdling Concept | Data Warehousing Tutorial | Edureka

***** Data Warehousing & BI Training: https://www.edureka.co/data-warehousing-and-bi ***** The allocation of system resources to various tasks, known as job scheduling, is a major assignment of the operating system. The system maintains prioritized queues of jobs waiting for CPU time and

From playlist Data Warehousing Tutorial Videos

Related pages

Algorithm | Coscheduling | Starvation (computer science)