Brian O’Nolan

Generalized Foreground-Background (FB), also known as Least Attained Service (LAS) is a scheduling policy.^[1] It consists in scheduling the process that has received the least service so far. Similarly to SRPT, the aim of FB is to improve the performance of a system, specifically mean response time. While SRPT is optimal it is more difficult to apply in practice as it requires accurate estimations of the service time of each request. In contrast, FB does not require estimations of service times, making it more practical but also less performing than SRPT.

References

^ Nuyens, Misja; Wierman, Adam (2008). "The Foreground-Background queue: a survey" (PDF). Performance Evaluation. 65 (3–4): 286–307. doi:10.1016/j.peva.2007.06.028. S2CID 2814864. Retrieved 7 August 2017.

[1] Nuyens, Misja; Wierman, Adam (2008). "The Foreground-Background queue: a survey" (PDF). Performance Evaluation. 65 (3–4): 286–307. doi:10.1016/j.peva.2007.06.028. S2CID 2814864. Retrieved 7 August 2017.

[1]

Processor scheduling
Algorithms	Deadline-monotonic Earliest deadline Earliest eligible virtual deadline first Fair-share Fixed-priority pre-emptive Foreground-background Gang Generalized foreground-background Highest response ratio next Lottery Multilevel feedback queue Process Contention Scope Proportional share Rate-monotonic Round-robin Shortest job next Shortest remaining time Statistical time-division multiplexing Stride Two-level Windows NT YDS algorithm
Linux	Brain Fuck Completely Fair O(1) O(n) SCHED DEADLINE SCHED FIFO SCHED NORMAL
Other	Processor affinity Starvation

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Brian O’Nolan

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