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Real-time scheduling on multithreaded processors

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6 Author(s)
Kreuzinger, J. ; Inst. for Comput. Design, Karlsruhe Univ., Germany ; Schulz, A. ; Pfeffer, M. ; Ungerer, T.
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This paper investigates real-time scheduling algorithms on upcoming multithreaded processors. As evaluation testbed we introduce a multithreaded processor kernel which is specifically designed as core processor of a micro-controller or system-on-a-chip. Handling of external real-time events is performed through multithreading. Real-time threads are used as interrupt service threads (ISTs) instead of interrupt service routines (ISRs). Our proposed micro-controller supports multiple ISTs with zero-cycle context switching overhead. We investigate the behavior of fixed priority preemptive, earliest deadline first, least laxity first and guaranteed percentage scheduling with respect to multithreaded processors. Our finding is that the strategies GP and LLF result in a good blending of instructions of different threads thus enabling a multithreaded processor to utilize latencies best. Assuming a zero-cycle context switch LLF performs best, however implementation cost context, are prohibitive

Published in:

Real-Time Computing Systems and Applications, 2000. Proceedings. Seventh International Conference on

Date of Conference:

2000

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