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Procrastination scheduling in fixed priority real-time systems

Ravindra Jejurikar, Rajesh Gupta
2004 SIGPLAN notices  
We propose algorithms to compute the maximum procrastination intervals for tasks scheduled by either the fixed priority or the dual priority scheduling policy.  ...  We show that dual priority scheduling always guarantees longer shutdown intervals than fixed priority scheduling.  ...  [20] address procrastination scheduling in periodic real-time systems and have proposed Leakage Control EDF (LC-EDF) and Leakage Control Dual Priority (LC-DP) scheduling algorithms.  ... 
doi:10.1145/998300.997173 fatcat:dylzghxpxvevddkgzov2t4imwm

Procrastination scheduling in fixed priority real-time systems

Ravindra Jejurikar, Rajesh Gupta
2004 Proceedings of the 2004 ACM SIGPLAN/SIGBED conference on Languages, compilers, and tools - LCTES '04  
We propose algorithms to compute the maximum procrastination intervals for tasks scheduled by either the fixed priority or the dual priority scheduling policy.  ...  We show that dual priority scheduling always guarantees longer shutdown intervals than fixed priority scheduling.  ...  [20] address procrastination scheduling in periodic real-time systems and have proposed Leakage Control EDF (LC-EDF) and Leakage Control Dual Priority (LC-DP) scheduling algorithms.  ... 
doi:10.1145/997163.997173 dblp:conf/lctrts/JejurikarG04 fatcat:dms25hwcmjdgfkzw2hdkb37i4e

Procrastination Scheduling for Fixed-Priority Tasks with Preemption Thresholds [chapter]

XiaoChuan He, Yan Jia
2008 Lecture Notes in Computer Science  
This paper targets energy-efficient fixed-priority with preemption threshold scheduling for periodic real-time tasks on a uniprocessor DVS system with non-negligible leakage power consumption.  ...  Dynamic Voltage Scaling (DVS), which adjusts the clock speed and supply voltage dynamically, is an effective technique in reducing the energy consumption of embedded real-time systems.  ...  System Model Task Model This study deals with the fixed priority preemptive scheduling of tasks in a real-time systems with hard constraints, i.e., systems in which the respect of time constraints is  ... 
doi:10.1007/978-3-540-88140-7_23 fatcat:hyypwcblungl3pv3ujekoruzgy

A Practical Framework to Study Low-Power Scheduling Algorithms on Real-Time and Embedded Systems

Jian Lin, Albert Cheng, Wei Song
2014 Journal of Low Power Electronics and Applications  
Real-time scheduling is one of the fields that has attracted extensive attention to design low-power, embedded/real-time systems.  ...  In this paper, we firstly review the fundamental advances in the research of energy-efficient, real-time scheduling.  ...  Acknowledgments This work was supported in part by the National Science Foundation under Award No. 0720856. Conflicts of Interest The authors declare no conflict of interest.  ... 
doi:10.3390/jlpea4020090 fatcat:ztn4bws26vd5lh2mvvypg2pnsq

Periodic charging scheme for fixed-priority real-time systems with renewable energy

Mario Bambagini, Hakan Aydin
2014 Proceedings of the 9th IEEE International Symposium on Industrial Embedded Systems (SIES 2014)  
This paper presents a proactive and highly predictable framework, called Periodic Charging Scheme (PCS), for fixed-priority real-time systems with renewable energy.  ...  However, the variable nature of the energy supply rate due to the environmental conditions creates serious challenges for embedded real-time systems targeting predictability.  ...  CONCLUSIONS In this paper, we addressed the energy management problem for fixed-priority real-time systems with renewable energy.  ... 
doi:10.1109/sies.2014.6871179 dblp:conf/sies/BambaginiA14 fatcat:occsqhy6knax3fatwfqyq6z24m

Adaptive power management for real-time event streams

Kai Huang, Luca Santinelli, Jian-Jia Chen, Lothar Thiele, Giorgio C. Buttazzo
2010 2010 15th Asia and South Pacific Design Automation Conference (ASP-DAC)  
Considering two different preemptive scheduling, i.e., earliest deadline first and fixed priority, we propose new method to adaptively control the power mode of the device according to historical arrivals  ...  Our method can not only tackle arbitrary event arrivals but also provide hard real-time guarantees with respect to both timing and backlog constraints.  ...  for all streams in Sunder the fixed-priority scheduling, if the device provides again full service after r" time unit.  ... 
doi:10.1109/aspdac.2010.5419928 dblp:conf/aspdac/HuangSCTB10 fatcat:g372igdlcne7nepgxojjste7dq

Enhanced Race-To-Halt: A Leakage-Aware Energy Management Approach for Dynamic Priority Systems

Muhammad Ali Awan, Stefan M. Petters
2011 2011 23rd Euromicro Conference on Real-Time Systems  
The recent technology trends have equipped the modern embedded processors with the several sleep states and reduced their overhead (energy/time) of the sleep transition.  ...  The state-of-the-art research on static power reduction at system level is based on assumptions that cannot easily be integrated into practical systems.  ...  [3] addressed the procrastination scheduling for periodic hard real-time systems and proposed Leakage Control EDF (LC-EDF) and Leakage Control Dual Priority (LC-DP) algorithms.  ... 
doi:10.1109/ecrts.2011.17 dblp:conf/ecrts/AwanP11 fatcat:5tkqmhf37rblthz4pmrueuq4li

Task-Dependent Processor Shutdown for Hard Real-Time Systems [chapter]

Henrik Lipskoch, Frank Slomka
2009 IFIP Advances in Information and Communication Technology  
In a hard real-time environment, one has to prove the real-time feasibility and thereby to guarantee that energy saving methods do not violate real-time constraints.  ...  The point in time when to initiate communication can be chosen manually (sporadic) as well as periodically. In either case the system has to function properly to provide reliable data.  ...  Test on Real-Time Feasibility As motivated in the introductory section, we do not want to limit us to periodic only task systems.  ... 
doi:10.1007/978-3-642-04284-3_12 fatcat:2j4olblkdveynlwhzltwcmkfbu

Productivity for Librarians: How to Get More Done In Less Time

Lisa Demczuk
2014 Journal of the Canadian Health Libraries Association  
The results assist in setting up a productive schedule of time and activities.  ...  The real value of the book is its practicality; useful tips and strategies are provided that can be used immediately as well as integrated more thoughtfully in the longer term.  ...  While a quick and easy read, Productivity for Librarians: How to Get More Done in Less Time does not promise a simple fix to productivity and workÁlife balance.  ... 
doi:10.5596/c11-063 fatcat:5lkp7q5icvc35btdxvgbk3fshq

A Blocking-Aware Scheduling for Real-Time Task Synchronization Using a Leakage-Controlled Method

Mu-Yen Chen, Da-Ren Chen, Shu-Ming Hsieh
2014 International Journal of Distributed Sensor Networks  
Due to the importance of power dissipation in the wireless sensor networks and embedded systems, real-time scheduling has been studied in terms of various optimization problems.  ...  Real-time tasks that synchronize to enforce mutually exclusive access to the shared resources could be blocked by lower priority tasks.  ...  (ii) P-PCP: all tasks are scheduled using procrastination technique under fixed priority [5] .  ... 
doi:10.1155/2014/428230 fatcat:nqjfoqw2kfabnndp7rqwmlfqoy

Race-to-halt energy saving strategies

Muhammad Ali Awan, Stefan M. Petters
2014 Journal of systems architecture  
We propose a set of leakage-aware energy management approaches that reduce the energy consumption of embedded real-time systems while respecting the real-time constraints.  ...  Energy consumption is one of the major issues for modern embedded systems.  ...  [7] addressed the leakage-aware scheduling for periodic hard real-time systems.  ... 
doi:10.1016/j.sysarc.2014.10.001 fatcat:kmyqpxufxrbmto3ajc2geerciq

DVSleak

Yifan Zhu, Frank Mueller
2007 Proceedings of the 2007 ACM SIGPLAN/SIGBED conference on Languages, compilers, and tools - LCTES '07  
We develop a novel combined leakage and DVS scheduling algorithm for real-time systems, DVSleak, based on earliestdeadline-first scheduling (EDF).  ...  This makes DVSleak the best combined DVS/leakage regulation approach for real-time systems that we know of.  ...  Their approach is based on fixed-priority scheduling while ours is based on dynamic priority EDF scheduling.  ... 
doi:10.1145/1254766.1254772 dblp:conf/lctrts/ZhuM07 fatcat:xzpcnqbj35ajjeeszhstlbf4te

Fixed-priority scheduling to reduce both the dynamic and leakage energy on variable voltage processors

Gang Quan, Linwei Niu, Bren Mochocki, Xiaobo S. Hu
2009 International Journal of Embedded Systems  
In this paper, we propose a DVS scheduling technique for fixed-priority hard realtime systems that can judiciously merge the short, scattered idle intervals into longer ones to reduce the shut-down overhead  ...  With ever-scaling VLSI technology, the leakage is becoming an increasingly serious concern when addressing the power consumption problem for next-generation real-time embedded systems.  ...  Quan's work is supported in part by the National Science Foundation under the CAREER Award CNS-0545913.  ... 
doi:10.1504/ijes.2009.027937 fatcat:jdkqpbvoi5cy3exofqptssljla

DVSleak

Yifan Zhu, Frank Mueller
2007 SIGPLAN notices  
We develop a novel combined leakage and DVS scheduling algorithm for real-time systems, DVSleak, based on earliestdeadline-first scheduling (EDF).  ...  This makes DVSleak the best combined DVS/leakage regulation approach for real-time systems that we know of.  ...  Their approach is based on fixed-priority scheduling while ours is based on dynamic priority EDF scheduling.  ... 
doi:10.1145/1273444.1254772 fatcat:7janzocg3zcvhovmr47pyj4phq

Online intra-task device scheduling for hard real-time systems

Muhammad Ali Awan, Stefan M. Petters
2012 7th IEEE International Symposium on Industrial Embedded Systems (SIES'12)  
While I/O device scheduling has been studied in the past for real-time systems, the use of energy resources by these scheduling algorithms may be improved.  ...  We propose an intra-task device scheduling algorithm for real time systems that allows to shut-down devices while ensuring system schedulability.  ...  Our algorithm explores online intra-task device scheduling in a hard-real time systems setting, based on a sporadic task model.  ... 
doi:10.1109/sies.2012.6356569 dblp:conf/sies/AwanP12 fatcat:d5jo5uzmnbfgtil5d3j42kbloy
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