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shortest job next wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 advantages and disadvantages 2 weighted shortest job first 3 see also 4 references toggle the table of contents shortest job next 15 languages العربية català deutsch ελληνικά eesti فارسی français italiano 한국어 монгол português русский türkçe українська 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia scheduling policy shortest job next being executed shortest job next sjn also known as shortest job first sjf or shortest process next spn is a method used by a computer operating system to decide which task to run first when a computer has multiple programs or commands waiting to be processed this scheduling policy chooses the waiting process with the smallest execution time 1 advantages and disadvantages edit sjn is advantageous because of its simplicity and because it minimizes the average amount of time each process has to wait until its execution is complete however it has the potential for process starvation for processes which will require a long time to complete if short processes are continually added highest response ratio next is similar but provides a solution to this problem using a technique called aging 2 another disadvantage of using sjn is that the total execution time of a job must be known before execution while it is impossible to predict execution time perfectly several methods can be used to estimate it such as a weighted average of previous execution times 3 multilevel feedback queue can also be used to approximate sjn without the need for the total execution time oracle 1 sjn can be effectively used with interactive processes which generally follow a pattern of alternating between waiting for a command and executing it if the execution burst of a process is regarded as a separate job the past behaviour can indicate which process to run next based on an estimate of its running time sjn is used in specialized environments where accurate estimates of running time are available sjn is a non preemptive algorithm shortest remaining time is a preemptive variant of sjn weighted shortest job first edit weighted shortest job first wsjf is a modification of the concept used in agile development where jobs get weighted with the cost of delay so that the highest valued jobs get done sooner 4 value flow rate vfr is an alternate more intuitive name given to wsjf which expresses cost of delay and duration using unitless relative points rather than actual units of time or money 5 see also edit shortest remaining time references edit 1 2 arpaci dusseau remzi h arpaci dusseau andrea c 2014 operating systems three easy pieces chapter scheduling introduction pdf arpaci dusseau books tanenbaum a s 2008 modern operating systems 3rd ed pearson education inc p 156 isbn 978 0 13 600663 3 silberschatz a galvin p b gagne g 2005 operating systems concepts 7th ed wiley p 161 isbn 0 471 69466 5 reinertsen donald 2008 principles of product development flow second generation lean product development celeritas publishing p 193 isbn 978 1 935401 00 1 knesek doug value flow rate a better name for a great measure retrieved april 8 2016 v t e queueing theory single queueing nodes d m 1 queue m d 1 queue m d c queue m m 1 queue burke s theorem m m c queue m m queue m g 1 queue pollaczek khinchine formula matrix analytic method m g k queue g m 1 queue g g 1 queue kingman s formula lindley equation fork join queue bulk queue arrival processes poisson point process markovian arrival process rational arrival process queueing networks jackson network traffic equations gordon newell theorem mean value analysis buzen s algorithm kelly network g network bcmp network service policies fifo lifo processor sharing round robin shortest job next shortest remaining time key concepts continuous time markov chain kendall s notation little s law product form solution balance equation quasireversibility flow equivalent server method arrival theorem decomposition method beneš method limit theorems fluid limit mean field theory heavy traffic approximation reflected brownian motion extensions fluid queue layered queueing network polling system adversarial queueing network loss network retrial queue information systems data buffer erlang unit erlang distribution flow control data message queue network congestion network scheduler pipeline software quality of service scheduling computing teletraffic engineering category retrieved from https en wikipedia org w index php title shortest_job_next oldid 1372879145 category processor scheduling algorithms hidden categories articles with short description short description matches wikidata this page was last edited on 2 september 2026 at 19 23 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents shortest job next 15 languages add topic