Abstract
This paper deals with the scheduling analysis of hard real-time streaming applications. These applications are mapped onto a heterogeneous multiprocessor system-on-chip (MPSoC), where we must jointly meet the timing requirements of several jobs. Each job is independently activated and processes streams at its own rate. The dynamic starting and stopping of jobs necessitates the usage of self-timed schedules (STSs). By modeling job implementations using multirate data flow (MRDF) graph semantics, real-time analysis can be performed. Traditionally, temporal analysis of STSs for MRDF graphs only aims at evaluating the average throughput. It does not cope well with latency, and it does not take into account the temporal behavior during the initial transient phase. In this paper, we establish an important property of STSs: the initiation times of actors in an STS are bounded by the initiation times of the same actors in any static periodic schedule of the same job; based on this property, we show how to guarantee strictly periodic behavior of a task within a self-timed implementation; then, we provide useful bounds on maximum latency for jobs with periodic, sporadic, and bursty sources, as well as a technique to check latency requirements. We present two case studies that exemplify the application of these techniques: a simplified channel equalizer and a wireless LAN receiver.
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References
Buttazzo GC: Hard Real-Time Computing Systems. Kluwer Academic Publishers, Boston, Mass, USA; 1997.
Moonen AJM, van den Berg R, Bekooij MJG, Bhullar H, van Meerbergen J: A multi-core architecture for in-car digital entertainment. Proceedings of Global Signal Processing Conference & Expos for the Industry, October 2005, Santa Clara, Calif, USA
Goossens K, Dielissen J, Rǎdulescu A: Æthereal network on chip: concepts, architectures, and implementations. IEEE Design and Test of Computers 2005,22(5):414-421. 10.1109/MDT.2005.99
Hansson A, Goossens K, Rǎdulescu A: A unified approach to constrained mapping and routing on network-on-chip architectures. Proceedings of International Conference on Hardware/Software Codesign and System Synthesis (CODES+ISSS '05), September 2005, Jersey City, NJ, USA 75–80.
Moreira OM, Mol JD, Bekooij MJG, van Meerbergen J: Multiprocessor resource allocation for hard-real-time streaming with a dynamic job-mix. Proceedings of IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS '05), March 2005, Francisco, Calif, USA 332–341.
Moreira OM, Bekooij MJG, Mol JD: Online resource mangement in a multiprocessor with a network-on-chip. Proceedings of the 22nd Annual ACM Symposium on Applied Computing (SAC '07), March 2007, Seoul, Korea
Lee EA, Messerschmitt DG: Synchronous data flow. Proceedings of the IEEE 1987,75(9):1235-1245.
Sriram S, Bhattacharyya SS: Embedded Multiprocessors: Scheduling and Synchronization. Marcel Dekker, New York, NY, USA; 2000.
Bambha N, Kianzad V, Khandelia M, Bhattacharyya SS: Intermediate representations for design automation of multiprocessor DSP systems. Design Automation for Embedded Systems 2002,7(4):307-323. 10.1023/A:1020307222052
Goddard S, Jeffay K: Managing latency and buffer requirements in processing graph chains. The Computer Journal 2001,44(6):486-503. 10.1093/comjnl/44.6.486
Jersak M, Richter K, Ernst R: Performance analysis of complex embedded systems. International Journal of Embedded Systems 2005,1(1-2):33-49.
Reiter R: Scheduling parallel computations. Journal of the ACM 1968,15(4):590-599. 10.1145/321479.321485
Lee EA, Messerschmitt DG: Static scheduling of synchronous data flow programs for digital signal processing. IEEE Transactions on Computers 1987,36(1):24-35.
Dasdan A: Experimental analysis of the fastest optimum cycle ratio and mean algorithms. ACM Transactions on Design Automation of Electronic Systems 2004,9(4):385-418. 10.1145/1027084.1027085
Poplavko P, Basten T, Bekooij MJG, van Meerbergen J, Mesman B: Task-level timing models for guaranteed performance in multiprocessor networks-on-chip. Proceedings of International Conference on Compilers, Architecture, and Synthesis for Embedded Systems (CASES '03), October-November 2003, San Jose, Calif, USA 63–72.
Baccelli F, Cohen G, Olsder G, Quadrat J-P: Synchronization and Linearity. John Wiley & Sons, New York, NY, USA; 1992.
Govindarajan R, Gao GR: A novel framework for multi-rate scheduling in DSP applications. Proceedings of International Conference on Application-Specific Array Processors, October 1993, Venice, Italy 77–88.
Ghamarian AH, Geilen MCW, Stuijk S, et al.: Throughput analysis of synchronous data flow graphs. Proceedings of the 6th International Conference on Application of Concurrency to System Design (ACSD '06), June 2006, Turku, Finland 25–36.
Corman TH, Leiserson CE, Rivest RL, Stein C: Introduction to Algorithms. McGraw-Hill, New York, NY, USA; 2001.
Moonen AJM, Bekooij MJG, van Meerbergen J: Timing analysis model for network based multiprocessor systems. Proceedings of the 15th Annual Workshop of Circuits, System and Signal Processing (ProRISC '04), November 2004, Veldhoven, The Netherlands 91–99.
Bekooij MJG, Hoes R, Moreira OM, et al.: Dataflow analysis for real-time embedded multiprocessor system design. In Dynamic and Robust Streaming in and between Connected Consumer Electronic Devices. Volume 3. Springer, New York, NY, USA; 2005:81-108. 10.1007/1-4020-3454-7_4
Govindarajan R, Gao GR, Desai P: Minimizing memory requirements in rate-optimal schedules. Proceedings of International Conference on Application Specific Array Processors, August 1994, San Francisco, Calif, USA 75–86.
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Moreira, O.M., Bekooij, M.J.G. Self-Timed Scheduling Analysis for Real-Time Applications. EURASIP J. Adv. Signal Process. 2007, 083710 (2007). https://doi.org/10.1155/2007/83710
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DOI: https://doi.org/10.1155/2007/83710