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1. An On-Line Optimal Algorithm for Scheduling Soft Aperiodic Tasks in Hard Real-Time Systems
- theory.snu.ac.kr
- An On-Line Optimal Algorithm for Scheduling Soft Aperiodic Tasks in Hard Real-Time Systems.
- Abstract This paper addresses the problem of jointly scheduling both hard deadline periodic tasks and soft deadline aperiodic tasks in dynamic-priority preemptive systems. ... In this paper, we present a new on-line algorithm that assigns a deadline to soft aperiodic tasks to achieve the minimum response times without missing any deadline of tasks. In contrast to other algorithms, our algorithm does not require any off-line calculation for scheduling aperiodic tasks. ...
2. math/0203252 What is Aperiodic Order?
- arxiv.org
- From: Uwe Grimm view email Date: Sun, 24 Mar 2002 14:54:02 GMT (572kb) What is Aperiodic Order?.
- Moody (Edmonton) Comments: 27 pages, many colour pictures Subj-class: History and Overview; Metric Geometry Journal-ref: Based on this manuscript, an article entitled "Die verborgene Ordnung der Quasikristalle" (in German) was published in: Spektrum der Wissenschaft (February 2002) 64-74 The theory of aperiodic order is concerned with the development of ideas stimulated by the discovery of quasicrystals. We give a gentle introduction to some mathematical aspects of aperiodic order, aimed at a more general audience. ...
3. Handling Aperiodic Tasks
- data.uta.edu
- Handling Aperiodic Tasks.
- Aperiodic tasks are in stark contrast to strictly periodic tasks come in three flavors: .
- A given real-time system can comprise of both periodic and aperiodic tasks. We will now look at how we can handle aperiodic tasks and how we may analyze them for schedulability. ...
- There are four main approaches to handling aperiodic tasks: .
- Use an Interrupt Handler: When an aperiodic task needs service, it uses an interrupt, which is serviced at the hardware (highest) priority level. ...
- Bounded: Treat the aperiodic task as a periodic task with the highest priority and period equal to minimum interarrival time. ...
- Bursty: Treat the aperiodic task as a periodic task with highest priority and its period and computation time are derived as follows: If the task can arrive a maximum of x times in any B time units, then we treat it as a task with period B and computation time requirement (x * c) where c is its computation requirement for one instance. ...
- Service at specified s/w priority: When an aperiodic task needs service, it uses a software interrupt which is serviced in its priority order. ...
- Each aperiodic task is split into two subtasks. ...
- A polling task runs periodically at a specific s/w priority level to service the aperiodic task (there is one polling task for each aperiodic task). ...
- Bounded: When polling is used, the worst-case response time for an aperiodic task occurs when the task arrives just after the polling task has checked for the task arrival. ... Therefore, the following relationship between the polling period (Tpoll), its deadline (Dpoll) and the deadline (D) of the aperiodic task must be satisfied: D - Tpoll >= Dpoll.
- In other words, the deadline of the polling task must be equal to (or less than) the deadline of the aperiodic task minus the wasted polling period. ...
- Bursty: Treat the aperiodic task as a periodic task with its period and computation time derived as follows: If the task can arrive a maximum of x times in any B time units, then we treat it as a task with period B (equal to deadline) and computation time requirement (x * c) where c is its computation requirement for one instance. ...
- Sporadic server: Similar to option 2, however a sporadic server algorithm is used to restrict the aperiodic service with predictable schedulability consequences to lower priority tasks. ...
4. Summer School in Aperiodic Order
- www.pims.math.ca
- Summer School in Aperiodic Order.
- Aperiodic Order:.
- Mathematically speaking the term `aperiodic order' is used to describe various geometric objects (such as certain tilings or tessellations of Euclidean space) which are non-periodic and yet display a remarkable degree of regularity. ...
- The objects of the mathematics of aperiodic order have become the models for these `quasi-crystals' and reciprocally their physics has continued to stimulate directions for research. ...
- Although less than fifty years old, the mathematics of aperiodic order has grown rapidly and is now an area of considerable activity. One of its most remarkable characteristics is the diversity of ideas that are involved: harmonic analysis, dynamical systems, ergodic theory, topology, substitution systems, discrete geometry, and operator algebras have all interacted with the subject and reciprocally examples from aperiodic order have provided unexpected insights in these subjects. ...
- Due to the newness of the subject and the fluidity of the ideas around it there is no single source that serves as an introduction to the mathematics of aperiodic order and its many facets. ...
5. A Synthetic Utilization Bound for Aperiodic Tasks with Resource Requirements
- csdl.computer.org
- 141 A Synthetic Utilization Bound for Aperiodic Tasks with Resource Requirements .
- Utilization bounds for schedulability of aperiodic tasks are new in real-time scheduling literature. All aperiodic bounds known to date apply only to independent tasks. ... First, they derive the first aperiodic utilization bound that considers a task model with resource requirements. ... Simulation results demonstrating the applicability of aperiodic utilization bounds are presented. Index Terms- Real-time scheduling, schedulability analysis, utilization bounds, aperiodic tasks .
6. (IUCr) Commission on Aperiodic Crystals
- www.ru.iucr.org
- Commission on Aperiodic Crystals.
- The Commission on Aperiodic Crystals of the IUCr has organized an Open Commission Meeting (OCM) at the International Conference of the IUCr in Geneva on Wednesday 7 August 2002. ...
7. Re: Aperiodic and periodic task
- www.rtems.com
- --> Date Prev Date Next Thread Prev Thread Next Date Index Thread Index Re: Aperiodic and periodic task.
- Subject: Re: Aperiodic and periodic task .
- > I wanna know scheduling concept of RTEMS running aperiodic and periodic task(rate monotonic). ...
- Aperiodic and periodic task .
- Prev by Date: Aperiodic and periodic task .
- Previous by thread: Aperiodic and periodic task .
8. Minimizing Aperiodic Response Times in a Firm Real-Time Environment
- wotan.liu.edu
- The Digital Librarian's Digital Library searchDOCIS Documents in Computing and Information Science Home >> Journals and Conference Proceedings >> IEEE Transactions on Software Engineering  Minimizing Aperiodic Response Times in a Firm Real-Time Environment Giorgio C. ...
9. Aperiodic monoid - explanation-Guide.info - for information, definition, meaning, reference - free encyclopedia, glossary of terms
- explanation-guide.info
- Search thousands of articles ► Friday, 25th March 2005 UTC Top > Meaning > Aperiodic monoid Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0-9 | By subject Aperiodic monoid: Meaning (information, definition, explanation, facts).
- In mathematics, an aperiodic monoid is a finite monoid M such that for every x ∈ M, there exists an integer n with .
- Remember what Aperiodic monoid means: .
- Search for Aperiodic monoid information on: amazon. ...
- info/meaning/Aperiodic-monoid. ...
- info/meaning/Aperiodic-monoid. html">Aperiodic monoid</a> .
10. RTSS 2000 WIP Paper: A Schedulable Utilization Bound for Aperiodic Tasks
- www.cse.ucsc.edu
- A Schedulable Utilization Bound for Aperiodic Tasks.
- To the author's knowledge, this is the first time a utilization bound is derived for the aperiodic task model. ... Our result provides theoretical grounds for guaranteeing deadlines of individual aperiodic requests by observing only the aggregate utilization conditions. ...
11. Scheduling Sporadic and Aperiodic Events in a Hard Real-Time System
- www.sei.cmu.edu
- Scheduling Sporadic and Aperiodic Events in a Hard Real-Time System.
- A real-time system consists of both aperiodic and periodic tasks. ... Aperiodic tasks have irregular arrival times and either soft or hard deadlines. In this paper, we present a new algorithm, the Sporadic Server algorithm, that greatly improves response times for soft-deadline aperiodic tasks and can guarantee hard deadlines for both periodic and aperiodic tasks. The operation of the Sporadic Server algorithm, its performance, and schedulability analysis are discussed and compared with previous, published aperiodic service algorithms. ...
12. 90.04 Aperiodic Behavior in the Dwarf Cepheid RY Leporis
- www.aas.org
- 04 Aperiodic Behavior in the Dwarf Cepheid RY Leporis.
- We were surprised to find that observations from the first quarter of 2000 show aperiodic variations quite inconsistent with previous observations. ...
- It is concluded that apart from occasional epochs of aperiodic behavior, RY Lep appears to have a normal temperature, radius, and luminosity for a dwarf Cepheid with a period of 0. ...
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