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- Anticipatory_scheduling abstract "Anticipatory scheduling is an algorithm for scheduling hard disk input/output (I/O scheduling). It seeks to increase the efficiency of disk utilization by "anticipating" future synchronous read operations."Deceptive idleness" is a situation where a process appears to be finished reading from the disk when it is actually processing data in preparation of the next read operation. This will cause a normal work-conserving I/O scheduler to switch to servicing I/O from an unrelated process. This situation is detrimental to the throughput of synchronous reads, as it degenerates into a seeking workload.Anticipatory scheduling overcomes deceptive idleness by pausing for a short time (a few milliseconds) after a read operation in anticipation of another close-by read requests.Anticipatory scheduling yields significant improvements in disk utilization for some workloads. In some situations the Apache web server may achieve up to 71% more throughput from using anticipatory scheduling.The Linux anticipatory scheduler may reduce performance on disks using Tagged Command Queuing (TCQ), high performance disks, and hardware RAID arrays. An anticipatory scheduler (AS) was the default Linux kernel scheduler between 2.6.0 and 2.6.18, by which time it was replaced by the CFQ scheduler.As of kernel version 2.6.33, the Anticipatory scheduler (AS) has been removed from the Linux kernel. The reason being that while useful, the scheduler's effects could be achieved through tuned use of other schedulers (mostly CFQ, which can also be configured to idle with the slice_idle tunable). Since the anticipatory scheduler added maintenance overhead while not improving the workload coverage of the Linux kernel, it was deemed redundant.".
- Anticipatory_scheduling wikiPageID "6138605".
- Anticipatory_scheduling wikiPageLength "3957".
- Anticipatory_scheduling wikiPageOutDegree "20".
- Anticipatory_scheduling wikiPageRevisionID "638089716".
- Anticipatory_scheduling wikiPageWikiLink Algorithm.
- Anticipatory_scheduling wikiPageWikiLink Apache_HTTP_Server.
- Anticipatory_scheduling wikiPageWikiLink Apache_web_server.
- Anticipatory_scheduling wikiPageWikiLink CFQ.
- Anticipatory_scheduling wikiPageWikiLink Category:Disk_scheduling_algorithms.
- Anticipatory_scheduling wikiPageWikiLink Category:Linux_kernel_features.
- Anticipatory_scheduling wikiPageWikiLink Category:Operating_system_kernels.
- Anticipatory_scheduling wikiPageWikiLink Deadline_scheduler.
- Anticipatory_scheduling wikiPageWikiLink Hard_disk.
- Anticipatory_scheduling wikiPageWikiLink Hard_disk_drive.
- Anticipatory_scheduling wikiPageWikiLink O_scheduling.
- Anticipatory_scheduling wikiPageWikiLink output.
- Anticipatory_scheduling wikiPageWikiLink Linux.
- Anticipatory_scheduling wikiPageWikiLink Linux_kernel.
- Anticipatory_scheduling wikiPageWikiLink Native_Command_Queuing.
- Anticipatory_scheduling wikiPageWikiLink Noop_scheduler.
- Anticipatory_scheduling wikiPageWikiLink Process_(computing).
- Anticipatory_scheduling wikiPageWikiLink RAID.
- Anticipatory_scheduling wikiPageWikiLink Scheduling_(computing).
- Anticipatory_scheduling wikiPageWikiLink Tagged_Command_Queuing.
- Anticipatory_scheduling wikiPageWikiLink Work-conserving.
- Anticipatory_scheduling wikiPageWikiLinkText "Anticipatory scheduler".
- Anticipatory_scheduling wikiPageWikiLinkText "Anticipatory scheduling".
- Anticipatory_scheduling wikiPageWikiLinkText "anticipatory scheduler".
- Anticipatory_scheduling wikiPageWikiLinkText "anticipatory".
- Anticipatory_scheduling hasPhotoCollection Anticipatory_scheduling.
- Anticipatory_scheduling wikiPageUsesTemplate Template:Linux-stub.
- Anticipatory_scheduling wikiPageUsesTemplate Template:Portal.
- Anticipatory_scheduling wikiPageUsesTemplate Template:Reflist.
- Anticipatory_scheduling subject Category:Disk_scheduling_algorithms.
- Anticipatory_scheduling subject Category:Linux_kernel_features.
- Anticipatory_scheduling subject Category:Operating_system_kernels.
- Anticipatory_scheduling hypernym Algorithm.
- Anticipatory_scheduling type Software.
- Anticipatory_scheduling type Algorithm.
- Anticipatory_scheduling type Kernel.
- Anticipatory_scheduling comment "Anticipatory scheduling is an algorithm for scheduling hard disk input/output (I/O scheduling). It seeks to increase the efficiency of disk utilization by "anticipating" future synchronous read operations."Deceptive idleness" is a situation where a process appears to be finished reading from the disk when it is actually processing data in preparation of the next read operation. This will cause a normal work-conserving I/O scheduler to switch to servicing I/O from an unrelated process.".
- Anticipatory_scheduling label "Anticipatory scheduling".
- Anticipatory_scheduling sameAs Anticipatory_scheduling.
- Anticipatory_scheduling sameAs m.0fs4xv.
- Anticipatory_scheduling sameAs Q549863.
- Anticipatory_scheduling sameAs Q549863.
- Anticipatory_scheduling wasDerivedFrom Anticipatory_scheduling?oldid=638089716.
- Anticipatory_scheduling isPrimaryTopicOf Anticipatory_scheduling.