Real-time event-handling and scheduling on a multithreaded Java microcontroller

Our aim is to investigate the suitability of hardware multithreading for real-time event handling in combination with appropriate real-time scheduling techniques. We designed and evaluated a multithreaded microcontroller based on a Java processor core. Java threads are used as Interrupt Service Thre...

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Vydáno v:Microprocessors and microsystems Ročník 27; číslo 1; s. 19 - 31
Hlavní autoři: Kreuzinger, J, Brinkschulte, U, Pfeffer, M, Uhrig, S, Ungerer, Th
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier B.V 01.02.2003
Témata:
Java processor
Multithreaded microcontroller
Multithreaded processor
Real-time event handling
Real-time scheduling
Multithreaded processor
Real-time scheduling
Real-time event handling
Java processor
Multithreaded microcontroller
ISSN:0141-9331, 1872-9436
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Shrnutí:Our aim is to investigate the suitability of hardware multithreading for real-time event handling in combination with appropriate real-time scheduling techniques. We designed and evaluated a multithreaded microcontroller based on a Java processor core. Java threads are used as Interrupt Service Threads (ISTs) instead of the Interrupt Service Routines (ISRs) of conventional processors. Our proposed Komodo microcontroller supports multiple ISTs with zero-cycle context switching overhead. A so-called priority manager implements several real-time scheduling algorithms in hardware. We show the feasibility of a hardware real-time scheduler integrated deeply into the processor pipeline with a VHDL design and its synthesis. Evaluations with a software simulator and real-time applications as benchmarks show that hardware multithreading reaches a 1.2–1.4 performance increase for hard real-time applications (multithreading without latency utilization) and a 2.0–2.6 speedup by latency utilization for programs without hard real-time requirements. With respect to real-time scheduling on a multithreaded microcontroller, the Least Laxity First (LLF) scheme outperforms the Fixed Priority Preemptive (FPP), Earliest Deadline First (EDF), and Guaranteed Percentage (GP) schemes, but suffers from the highest implementation costs.
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ISSN:0141-9331
1872-9436
DOI:10.1016/S0141-9331(02)00082-0