Data Portal @ linkeddatafragments.org

Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Earliest_deadline_first_scheduling> ?p ?o. }

• Earliest_deadline_first_scheduling abstract "Earliest deadline first (EDF) or least time to go is a dynamic scheduling algorithm used in real-time operating systems to place processes in a priority queue. Whenever a scheduling event occurs (task finishes, new task released, etc.) the queue will be searched for the process closest to its deadline. This process is the next to be scheduled for execution.EDF is an optimal scheduling algorithm on preemptive uniprocessors, in the following sense: if a collection of independent jobs, each characterized by an arrival time, an execution requirement and a deadline, can be scheduled (by any algorithm) in a way that ensures all the jobs complete by their deadline, the EDF will schedule this collection of jobs so they all complete by their deadline. With scheduling periodic processes that have deadlines equal to their periods, EDF has a utilization bound of 100%. Thus, the schedulability test for EDF is:where the are the worst-case computation-times of the processes and the are their respective inter-arrival periods (assumed to be equal to the relative deadlines).That is, EDF can guarantee that all deadlines are met provided that the total CPU utilization is not more than 100%. Compared to fixed priority scheduling techniques like rate-monotonic scheduling, EDF can guarantee all the deadlines in the system at higher loading. However, when the system is overloaded, the set of processes that will miss deadlines is largely unpredictable (it will be a function of the exact deadlines and time at which the overload occurs.) This is a considerable disadvantage to a real time systems designer. The algorithm is also difficult to implement in hardware and there is a tricky issue of representing deadlines in different ranges (deadlines must be rounded to finite amounts, typically a few bytes at most). If a modular arithmetic is used to calculate future deadlines relative to now, the field storing a future relative deadline must accommodate at least the value of the (("duration" {of the longest expected time to completion} * 2) + "now"). Therefore EDF is not commonly found in industrial real-time computer systems.Instead, most real-time computer systems use fixed priority scheduling (usually rate-monotonic scheduling). With fixed priorities, it is easy to predict that overload conditions will cause the low-priority processes to miss deadlines, while the highest-priority process will still meet its deadline.There is a significant body of research dealing with EDF scheduling in real-time computing; it is possible to calculate worst case response times of processes in EDF, to deal with other types of processes than periodic processes and to use servers to regulate overloads.".
• Earliest_deadline_first_scheduling thumbnail EDF_Example_Timing_Diagram.png?width=300.
• Earliest_deadline_first_scheduling wikiPageExternalLink plan_9.
• Earliest_deadline_first_scheduling wikiPageExternalLink 398470.
• Earliest_deadline_first_scheduling wikiPageExternalLink xm(1).
• Earliest_deadline_first_scheduling wikiPageExternalLink marte.unican.es.
• Earliest_deadline_first_scheduling wikiPageExternalLink citation.cfm?id=78285.
• Earliest_deadline_first_scheduling wikiPageExternalLink L_OSPERT09-HMPR.
• Earliest_deadline_first_scheduling wikiPageExternalLink shark.sssup.it.
• Earliest_deadline_first_scheduling wikiPageExternalLink ?p=3.
• Earliest_deadline_first_scheduling wikiPageExternalLink 254.
• Earliest_deadline_first_scheduling wikiPageExternalLink www.irmosproject.eu.
• Earliest_deadline_first_scheduling wikiPageExternalLink Reneging.pdf.
• Earliest_deadline_first_scheduling wikiPageID "33719526".
• Earliest_deadline_first_scheduling wikiPageRevisionID "603719309".
• Earliest_deadline_first_scheduling hasPhotoCollection Earliest_deadline_first_scheduling.
• Earliest_deadline_first_scheduling subject Category:Real-time_computing.
• Earliest_deadline_first_scheduling subject Category:Scheduling_algorithms.
• Earliest_deadline_first_scheduling type Abstraction100002137.
• Earliest_deadline_first_scheduling type Act100030358.
• Earliest_deadline_first_scheduling type Activity100407535.
• Earliest_deadline_first_scheduling type Algorithm105847438.
• Earliest_deadline_first_scheduling type Event100029378.
• Earliest_deadline_first_scheduling type Procedure101023820.
• Earliest_deadline_first_scheduling type PsychologicalFeature100023100.
• Earliest_deadline_first_scheduling type Rule105846932.
• Earliest_deadline_first_scheduling type SchedulingAlgorithms.
• Earliest_deadline_first_scheduling type YagoPermanentlyLocatedEntity.
• Earliest_deadline_first_scheduling comment "Earliest deadline first (EDF) or least time to go is a dynamic scheduling algorithm used in real-time operating systems to place processes in a priority queue. Whenever a scheduling event occurs (task finishes, new task released, etc.) the queue will be searched for the process closest to its deadline.".
• Earliest_deadline_first_scheduling label "Algorytm EDF".
• Earliest_deadline_first_scheduling label "Earliest Deadline First".
• Earliest_deadline_first_scheduling label "Earliest Deadline First".
• Earliest_deadline_first_scheduling label "Earliest deadline first scheduling".
• Earliest_deadline_first_scheduling label "Earliest deadline first scheduling".
• Earliest_deadline_first_scheduling label "Earliest deadline first scheduling".
• Earliest_deadline_first_scheduling sameAs Earliest_deadline_first.
• Earliest_deadline_first_scheduling sameAs Earliest_Deadline_First.
• Earliest_deadline_first_scheduling sameAs Earliest_deadline_first_scheduling.
• Earliest_deadline_first_scheduling sameAs Earliest_Deadline_First.
• Earliest_deadline_first_scheduling sameAs 최단_마감_우선_스케줄링.
• Earliest_deadline_first_scheduling sameAs Earliest_deadline_first_scheduling.
• Earliest_deadline_first_scheduling sameAs Algorytm_EDF.
• Earliest_deadline_first_scheduling sameAs m.01jgdc.
• Earliest_deadline_first_scheduling sameAs Q666365.
• Earliest_deadline_first_scheduling sameAs Q666365.
• Earliest_deadline_first_scheduling sameAs Earliest_deadline_first_scheduling.
• Earliest_deadline_first_scheduling wasDerivedFrom Earliest_deadline_first_scheduling?oldid=603719309.
• Earliest_deadline_first_scheduling depiction EDF_Example_Timing_Diagram.png.
• Earliest_deadline_first_scheduling isPrimaryTopicOf Earliest_deadline_first_scheduling.