Date: Thursday 12 March 2015
Time: 11:00 - 12:30
Location / Room: Stendhal
Chair:
Benny Akesson, Czech Technical University in Prague, CZ
Co-Chair:
Rodolfo Pellizzoni, University of Waterloo, CA
Introducing modern architectures, such as multicore platforms, in real-time systems is challenging. The papers in this session make a contribution in this direction by discussing new scheduling techniques for parallel real-time tasks, multicore architectures, and mixed-criticality systems.
| Time | Label | Presentation Title Authors |
|---|---|---|
| 11:00 | 10.3.1 | THE FEDERATED SCHEDULING OF CONSTRAINED-DEADLINE SPORADIC DAG TASK SYSTEMS Speaker: Sanjoy Baruah, The University of North Carolina at Chapel Hill, US Abstract In the federated approach to multiprocessor scheduling, a task is either restricted to execute upon a single processor (as in partitioned scheduling), or has exclusive access to any processor upon which it may execute. Earlier studies concerning the federated scheduling of task systems represented using the sporadic DAG model were restricted to implicit-deadline task systems; the research reported here extends this study to the consideration of task systems represented using the more general {em constrained/}-deadline sporadic DAG model. Download Paper (PDF; Only available from the DATE venue WiFi) |
| 11:30 | 10.3.2 | RUN AND BE SAFE: MIXED-CRITICALITY SCHEDULING WITH TEMPORARY PROCESSOR SPEEDUP Speakers: Pengcheng Huang, Pratyush Kumar, Georgia Giannopoulou and Lothar Thiele, Swiss Federal Institute of Technology in Zurich (ETHZ), CH Abstract Mixed-Criticality systems are arising due to the push from several major industries including avionics and automotive, where functionalities with different safety criticality levels are integrated into a modern computing platform to reduce size, weight and energy. The state-of-the-art research has focused on protecting critical tasks under the threat of task overrun, which is achieved by killing less critical tasks or degrading their services to free system resources to guarantee critical tasks. We take in this paper a different approach to protecting critical tasks by embracing rich features of modern computing platforms. In particular, we explore dynamic processor speedup to aid the scheduling of mixed-criticality systems. We show that speedup in situation of overrun can not only help to protect the timeliness of critical tasks, but also to improve the degraded services for less critical tasks. Furthermore, we show that speedup is even more attractive as it can help the system to recover faster to normal operation. Thus, speedup could only be temporarily required and incur low cost. The proposed techniques are validated by both theoretical analysis and experimental results with an industrial flight management system and extensive simulations. Download Paper (PDF; Only available from the DATE venue WiFi) |
| 12:00 | 10.3.3 | MULTI-CORE FIXED-PRIORITY SCHEDULING OF REAL-TIME TASKS WITH STATISTICAL DEADLINE GUARANTEE Speakers: Tianyi Wang1, Linwei Niu2, Shaolei Ren1 and Gang Quan1 1Florida International University, US; 2West Virginia State University, US Abstract The rising performance variance of IC chips and increased resource sharing in multi-core platforms have significantly degraded the predictability of real-time systems. The traditional deterministic approaches can be extremely pessimistic, if not feasible at all. In this paper, we adopt a probabilistic approach for fixed-priority preemptive scheduling of real-time tasks on multi-core platforms with statistical deadline miss ratio guarantee. Rather than a single-valued worst-case execution time (WCET), we formulate the task execution time as a probabilistic distribution. We develop a novel algorithm to partition real-time tasks on multiple homogenous cores, which takes not only task execution time distributions but their period relationships into considerations. Our extensive experimental results show that our proposed methods can greatly improve the schedulability of real-time tasks when compared with the traditional bin packing approaches. Download Paper (PDF; Only available from the DATE venue WiFi) |
| 12:30 | End of session Lunch Break, Keynote lecture from 1320 - 1350 (Room Oisans) in Les Écrins Coffee Break in Exhibition AreaOn all conference days (Tuesday to Thursday), coffee and tea will be served during the coffee breaks at the below-mentioned times in the exhibition area. Lunch BreakOn Tuesday and Wednesday, lunch boxes will be served in front of the session room Salle Oisans and in the exhibition area for fully registered delegates (a voucher will be given upon registration on-site). On Thursday, lunch will be served in Room Les Ecrins (for fully registered conference delegates only). Tuesday, March 10, 2015Coffee Break 10:30 - 11:30 Lunch Break 13:00 - 14:30; Keynote session from 13:20 - 14:20 (Room Oisans) sponsored by Mentor Graphics Coffee Break 16:00 - 17:00 Wednesday, March 11, 2015Coffee Break 10:00 - 11:00 Lunch Break 12:30 - 14:30, Keynote lectures from 12:50 - 14:20 (Room Oisans) Coffee Break 16:00 - 17:00 Thursday, March 12, 2015Coffee Break 10:00 - 11:00 Lunch Break 12:30 - 14:00, Keynote lecture from 13:20 - 13:50 Coffee Break 15:30 - 16:00 |