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Topic: Earliest deadline first scheduling

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	Earliest Deadline First - Unofficial BOINC Wiki
		Earliest Deadline First Work Scheduler mode is used to ensure that Deadlines for work are met.
		That each CPU is assigned the Work Unit with the earliest deadline that is not already being processed by another CPU.
		Earliest Deadline First mode is deprecated in BOINC Versions 5.6.0 and later.
	www.boinc-wiki.info /index.php?title=Earliest_Deadline_First (77 words)

	Earliest deadline first scheduling - Biocrawler (Site not responding. Last check: 2007-11-06)
		Earliest deadline first scheduling is a dynamic scheduling principle used in real-time operating systems.
		Compared to static scheduling techniques like rate-monotonic scheduling, earliest deadline first will generally perform better, utilizing up to 100% of CPU time (when scheduling processor allocation time).
		Because deadlines are dynamic, when the system is overloaded the process that misses its deadline will be 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.
	www.biocrawler.com /encyclopedia/Earliest_deadline_first_scheduling (200 words)

	Using earliest-deadline-first scheduling because computer is overcommitted.
		The scheduler says the computer is over-committed, so it is using earliest-deadline-first scheduling, and indeed it has only run P@H WUs for the last 40 hours.
		PP@H normally has 7 day deadlines, so a 3.5 day queue will always be in EDF mode when PP@H workunits are on the host.
		Because of dail-up issues EDF is entered when a deadline is less that 2*queue length away.
	setiathome.ssl.berkeley.edu /forum_thread.php?id=18287 (451 words)

	Earliest deadline first scheduling - Glasgledius (Site not responding. Last check: 2007-11-06)
		Earliest deadline first scheduling is a dynamic scheduling principle found in real-time operating systems.
		It will adress processes in a priority queue and run them to the end, and on the end of each execution of a process, the queue will be searched for the process closest to it's deadline.
		Compared to static scheduling, like rate-monotonic scheduling, earliest dealine first will generally perform better, utilizing up to 100% of the CPU time.
	www.glasglow.com /E2/ea/Earliest_deadline_first_scheduling.html (104 words)

	[No title]
		For example, for a service call, the first end in end-to-end is the first instruction starting the invocation of a CORBA service The second end is the last instruction that establishes the result of the invocation in the invoker.
		Fixed Priority Scheduling priority scheduling in which the priorities are changeable by the application but not by the scheduler (except for priority inheritance).
		Dynamic Priority Scheduling priority scheudling in which both the application and the scheduler can change the prioritite based upon performance realted attributes, for example, based upon deadlines as used in earliest deadline first scheduling (EDF).
	www.omg.org /docs/realtime/97-05-02.doc (797 words)

	Embedded.com - Deadline Scheduling
		The scheduler controls the order of the queues, and it may reshuffle them on any significant event: passage of time, completion of a task, change of a lock's state, or appearance of a new runnable task.
		Scheduling tasks based on slack time requires cost metrics for scheduling, but it works as well as EDF, degrades a little more gracefully under overload, and extends relatively well to scheduling multiple processors.
		Systems that are designed for a deadline scheduler make strenuous efforts to reduce the number of non-schedulable entities and the amount of CPU time that they need.
	www.embedded.com /story/OEG20010304S0004 (3689 words)

	D. Kalinsky Associates - Whitepaper "New Directions in RTOS Kernels"
		Deadline schedulers are of interest in DSP and multi-media applications where crisp timing and consistency of
		deadline, it may as a result cause one or more higher priority tasks to miss their deadlines.
		But deadline scheduling is not the only future alternative to today’s priority-based preemptive scheduling.
	www.kalinskyassociates.com /Wpaper7.html (2539 words)

	Encyclopedie :: Earliest deadline first scheduling (Site not responding. Last check: 2007-11-06)
		Earliest deadline first scheduling is een dynamisch scheduling principe gebruikt in real-time besturingssystemen.
		Vergeleken met statische scheduling technieken zoals rate-monotonic scheduling zal earliest deadline first beter presteren en tot 100% van de beschikbare CPU tijd gebruiken (wanneer het processor tijd uitdeelt).
		In 2001, when he was principal at Harriton Highnoticed that students were receiving their schedules on the first day of school.
	encyclopedie.ws /Earliest_deadline_first_scheduling (336 words)

	Q-MARS: Q-EDF Overview (Site not responding. Last check: 2007-11-06)
		In real-time system research area, the EDF (Earliest Deadline First) scheduling algorithm has been long studied, and is known to offer high levels of schedulable utilization; however, it requires an infinite granularity of priorities.
		Uniform partition is the optimal partition for uniform deadlines.
		Given first two moments of the incoming tasks, deadline range and mean deadline, uniform partition is the optimal partition for the worst case of unknown deadline distributions
	www.cs.cmu.edu /People/rtml/muri/qedf.htm (332 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		Scheduling and Admission Testing for Jitter Constrained Periodic Threads Andreas Mauthe and Geoff Coulson Distributed Multimedia Research Group, Department of Computing, Lancaster University, Lancaster LA1 4YR, UK telephone: +44 (0)1524 65201 e-mail: [andreas, geoff]@comp.lancs.ac.uk KEYWORDS: Admission Testing, CPU-Scheduling ABSTRACT We present new admission tests for periodic real-time threads with explicitly stated deadlines.
		In standard earliest-deadline-first scheduling, the deadline of a periodic thread is conventionally the end of the current period.
		In the extreme case, the deadline may be specified as identical to the execution time, which results in perfectly isochronous periodic threads.
	hulk.bu.edu /nossdav95/papers/mauthe_coulson.txt (196 words)

	Abstract: Admissibility Tests for Interrupted Earliest Deadline First Scheduling with Priority Inheritance (Site not responding. Last check: 2007-11-06)
		Admissibility Tests for Interrupted Earliest Deadline First Scheduling with Priority Inheritance
		In this paper we provide a formal analysis to extend Liu’s earliest deadline first schedulability test to include clocked, interspaced sporadic, and general real-time interrupts.
		We then further extend the test to include priority inheritance and critical sections, both with and without enforcement mechanisms.
	www.employees.org /~ssommer/TR9710abs.html (67 words)

	Tirgul 13 -solution
		First come, first served (FCFS) is a simple non-preemptive scheduling algorithm that is only suitable for non-interactive batch systems.
		The earliest deadline first scheduling strategy is used for real time systems, where TT and RT are irrelevant.
		Priority scheduling using multi-level queues is another preemptive scheduling strategy that can be used in both interactive and non-interactive batch systems.
	www.cs.bgu.ac.il /~os032/tirgul14/Tirgul_14_-solution.html (1487 words)

	Dynamic Window-Constrained Scheduling
		Enabling the compilation of the DWCS scheduler allows an entry in the /proc filesystem to be configured, showing the current state of DWCS scheduled processes.
		To guarantee a feasible schedule, whereby all process' window-constraints are met as long as the total minimum utilization is less than 100%, original service constraints must be converted to their canonical form.
		Observe that a process with an original window-constraint of 0/0 actually forces the scheduler to treat it as a deadline-constrained process, whose deadline is calculated from the current time and the request period.
	www.cs.bu.edu /fac/richwest/dwcs.html (4166 words)

	Solutions to Hw #2
		Q3a) Under the assumptions that there exits a schedule such that all jobs can be completed within the deadline, the ‘earliest deadline first’ scheduling algorithm provides an optimal schedule.
		According to this scheduling algorithm, of all the processes available for scheduling presently, one with the earliest deadline is selected to be executed if it can finish within the deadline.
		Proof: Any optimal schedule can be converted into an EDS schedule by switching jobs with smaller deadline with that with greater deadline several number of times (bubble sort) as shown in lemma 2.
	www.cs.cornell.edu /Courses/cs414/2000FA/sol2.htm (1141 words)

	Unit 1 Section 1 COMP617
		Deadline: Instant of time in which a job's execution is required to be completed.
		The Scheduler will allocate each block to the processor such that the deadlines and periods of all processes are met.
		Job scheduling and the allocation of resources are based on a set of scheduling algorithms and access control protocols.
	ccism.pc.athabascau.ca /html/courses/comp617/CourseSample/unit01/section1.htm (1253 words)

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	e-broadcastnewsasia.blogspot.com /2006_07_01_e-broadcastnewsasia_archive.html (5143 words)

	Embedded.com - Scheduling Sporadic Events
		Static-priority preemptive schedulers require that an engineer assign unique priorities to individual threads to inform the scheduler which thread to run when multiple threads are ready.
		The scheduler thereby forces the thread's processor utilization to conform to the designers' expectations and to the assumptions of optimal rate monotonic static-priority preemptive scheduling.
		The scheduler deducts three units from the budget and schedules a three unit replenishment to occur twelve units after the thread unblocked.
	www.embedded.com /story/OEG20021125S0043 (3015 words)

	Digital works - TechPage
		In case there are collisions, we schedule such that the average response becomes high, by scheduling the task that has the most waiting time.
		On blocking the HRT task could nominate a temporary deadline, which will be obeyed by the kernel once as soon as the task awakes, after which the kernel will start to use the older deadline.
		And the scheduling algorithm is the highest priority first scheduling.
	www.digitalworks.iwarp.com /lattur.htm (5599 words)

	Earliest deadline first scheduling (Site not responding. Last check: 2007-11-06)
		always choose the ready process with the earliest deadline (cf.
		deadline at any given time is the display time of the next video frame
		only applicable where it is meaningful to assign deadlines to processes - e.g.
	www.comp.lancs.ac.uk /computing/users/geoff/210/os/tsld160.htm (54 words)

	The Real-Time Threads Package (Site not responding. Last check: 2007-11-06)
		Schedulable threads (i.e., threads whose starting time has passed) are scheduled on a highest priority first basis.
		Schedulable threads of equal priority use an earliest deadline first (EDF) scheduling policy.
		Alternate scheduling policies, such as time slicing, can be implemented at the application level using the scheduling mechanisms provided by RT Threads.
	www.cs.ubc.ca /labs/dsg/rtthreads/rtthreads.html (169 words)

	earliest deadline first scheduling
		Please post the messages in front of the "earliest deadline first" message as well, as that will tell which project it will go into EDF mode for.
		First solution is to reduce your queue size so that only one task from another project will download at a time.
		Also since the CPDN project is not terribly concerned about deadlines you can just let it run as is until a fix for the scheduler is released.
	boinc.berkeley.edu /dev/forum_thread.php?id=750 (925 words)

	[Abstract] Scheduling Non-Real-Time Traffic in Earliest-Deadline-First Packet Scheduler
		In this paper, we study a packet scheduling scheme which services a mix of non real-time and real-time traffic under EDF scheduling algo rithm using slack time.
		The time complexity for calculation of slack time and deadline as signment to the non-real-time packets is O(1) and thus the scheduling of non-real-time traffic can be performed at a low cost.
		We also presented an admission control algorithm which guarantees the schedulability of the real-time flows while providing the non-real-time flows with fast response time.
	www.actapress.com /Abstract.aspx?paperId=16709 (166 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		Given the arrival curve (i.e., envelope) and delay requirement of a flow, the corresponding service curve is calculated and the SCED (Service Curve-based Earliest Deadline first) scheduling algorithm is used to ensure that the flow receives the service as promised by the service curve.
		The deadline of a packet is the time at which the packet would be served if the flow receives service according to the service curve.
		The deadlines can be calculated and assigned to packets at the first network element, and a distributed network-wide earliest deadline first policy can be used to schedule packets at all network elements.
	www.cs.berkeley.edu /~kwei/readings/QoS/summaries/service_curve.doc (367 words)

	The Earliest Deadline First Scheduling with Active Buffer Management for Real-Time Traffic in the Internet
		A two-level hierarchical scheduling framework is deployed for the separation of the QoS metrics.
		Due to the desirable property of minimizing the maximum packet lateness, the Earliest Deadline First (EDF) scheduling is adopted to provide the in-class scheduling for the time-sensitive traffic.
		We propose to employ an EDF scheduler combined with an active buffer management scheme (CHOKe) to improve the fairness of resource allocation and to maintain a good delay performance for all real-time applications.
	ihome.ust.hk /~heixj/publication/icn01 (159 words)

	Bibliography (Site not responding. Last check: 2007-11-06)
		Hei and D. Tsang, ``The earliest deadline first scheduling with active buffer management for real-time traffic in the Internet,'' in Proceedings of the First International Conference on Networking-Part 1.Springer-Verlag, 2001, pp.
		Andrews, ``Probabilistic end-to-end delay bounds for earliest deadline first scheduling,'' in Proceedings of INFOCOM, vol.
		Sivaraman and F. Chiussi, ``End-to-end statistical delay guarantees using earliest deadline first (EDF) packet scheduling,'' in Proceedings of GLOBECOM, vol.
	www.ee.ust.hk /~heixj/research/edf.htm (1064 words)

	CSIRO ICT Centre
		Conducted Ph.D. research in the analysis and implementation of packet scheduling mechanisms for high-speed switch-routers.
		Sivaraman and F. Chiussi, "Statistical Analysis of Delay Bound Violations at an Earliest Deadline First (EDF) Scheduler", Perf.
		Sivaraman and F. Chiussi, "End-to-End Statistical Delay Guarantees using Earliest Delay First (EDF) Packet Scheduling", IEEE GLOBECOM 1999, Rio de Janeiro, Brazil, Aug 1999.
	www.ict.csiro.au /staff/Vijay.Sivaraman (517 words)

	Using earliest-deadline-first scheduling because computer is overcommitted. - Unofficial BOINC Wiki
		Until all of these conditions are false Work Units will be processed in Earliest Deadline First order and will not switch.
		The CPU Scheduler is running the Work Unit with the earliest Deadline instead of the Work Unit with the highest Short Term Debt.
		Because we are obviously overcommitted, in that we have a Result past it's Deadline, we should not fetch any more work for now.
	boinc-wiki.ath.cx /index.php?title=Using_earliest-deadline-first_scheduling_because_computer_is_overcommitted. (214 words)

	Earliest deadline first scheduling - Definition up Erdmond.Com (Site not responding. Last check: 2007-11-06)
		is a dynamic scheduling principle used in real-time_operating_systems.
		On the end of each execution of a process, it is enqueued at the end, and the queue will be searched for the process closest to its deadline.
		Compared to static scheduling techniques like rate-monotonic_scheduling, earliest deadline first will generally perform better, utilizing up to 100% of CPU time.
	www.erdmond.com /Earliest_deadline_first_scheduling.html (139 words)

	Earliest Deadline First Dispatching
		{AI95-00357-01} The deadline of a task is an indication of the urgency of the task; it represents a point on an ideal physical time line.
		A pragma is defined to assign an initial deadline to a task.
		The task at the head of a queue is the one with the earliest deadline.
	www.adaic.org /standards/05aarm/html/AA-D-2-6.html (1322 words)

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