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- Two-level_scheduling abstract "Two-level scheduling is a computer science term to describe a method to more efficiently perform process scheduling that involves swapped out processes. Consider this problem: A system contains 50 running processes all with equal priority. However, the system's memory can only hold 10 processes in memory simultaneously. Therefore, there will always be 40 processes swapped out written on virtual memory on the hard disk. The time taken to swap out and swap in a process is 50 ms respectively. With straightforward Round-robin scheduling, every time a context switch occurs, a process would need to be swapped in (because only the 10 least recently used processes are swapped in). Choosing randomly among the processes would diminish the probability to 80% (40/50). If that occurs, then obviously a process also need to be swapped out. Swapping in and out of is costly, and the scheduler would waste much of its time doing unneeded swaps.That is where two-level scheduling enters the picture. It uses two different schedulers, one lower-level scheduler which can only select among those processes in memory to run. That scheduler could be a Round-robin scheduler. The other scheduler is the higher-level scheduler whose only concern is to swap in and swap out processes from memory. It does its scheduling much less often than the lower-level scheduler since swapping takes so much time. Thus, the higher-level scheduler selects among those processes in memory that have run for a long time and swaps them out. They are replaced with processes on disk that have not run for a long time. Exactly how it selects processes is up to the implementation of the higher-level scheduler. A compromise has to be made involving the following variables: Response time: A process should not be swapped out for too long. Then some other process (or the user) will have to wait needlessly long. If this variable is not considered resource starvation may occur and a process may not complete at all. Size of the process: Larger processes must be subject to fewer swaps than smaller ones because they take longer time to swap. Because they are larger, fewer processes can share the memory with the process. Priority: The higher the priority of the process, the longer it should stay in memory so that it completes faster.".
- Two-level_scheduling wikiPageID "1068363".
- Two-level_scheduling wikiPageLength "2661".
- Two-level_scheduling wikiPageOutDegree "13".
- Two-level_scheduling wikiPageRevisionID "658409243".
- Two-level_scheduling wikiPageWikiLink Albert_Woodhull.
- Two-level_scheduling wikiPageWikiLink Andrew_S._Tanenbaum.
- Two-level_scheduling wikiPageWikiLink Category:Processor_scheduling_algorithms.
- Two-level_scheduling wikiPageWikiLink Computer_data_storage.
- Two-level_scheduling wikiPageWikiLink Computer_science.
- Two-level_scheduling wikiPageWikiLink Computer_storage.
- Two-level_scheduling wikiPageWikiLink Context_switch.
- Two-level_scheduling wikiPageWikiLink Process_(computing).
- Two-level_scheduling wikiPageWikiLink Resource_starvation.
- Two-level_scheduling wikiPageWikiLink Response_time_(technology).
- Two-level_scheduling wikiPageWikiLink Round-robin_scheduling.
- Two-level_scheduling wikiPageWikiLink Scheduling_(computing).
- Two-level_scheduling wikiPageWikiLink Starvation_(computer_science).
- Two-level_scheduling wikiPageWikiLink Swapped_out.
- Two-level_scheduling wikiPageWikiLink Virtual_memory.
- Two-level_scheduling hasPhotoCollection Two-level_scheduling.
- Two-level_scheduling wikiPageUsesTemplate Template:Comp-sci-stub.
- Two-level_scheduling subject Category:Processor_scheduling_algorithms.
- Two-level_scheduling hypernym Term.
- Two-level_scheduling type Algorithm.
- Two-level_scheduling comment "Two-level scheduling is a computer science term to describe a method to more efficiently perform process scheduling that involves swapped out processes. Consider this problem: A system contains 50 running processes all with equal priority. However, the system's memory can only hold 10 processes in memory simultaneously. Therefore, there will always be 40 processes swapped out written on virtual memory on the hard disk. The time taken to swap out and swap in a process is 50 ms respectively.".
- Two-level_scheduling label "Two-level scheduling".
- Two-level_scheduling sameAs m.0435bs.
- Two-level_scheduling sameAs Q7858726.
- Two-level_scheduling sameAs Q7858726.
- Two-level_scheduling wasDerivedFrom Two-level_scheduling?oldid=658409243.
- Two-level_scheduling isPrimaryTopicOf Two-level_scheduling.