Real Java for real time - gain and pain

Nilsson, Anders; Ekman, Torbjörn; Nilsson, Klas

doi:10.1145/581630.581680

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…A slight variation on this strategy is to compile Java source code (not byte code) into C and then use the C compiler for the platform to compile and link the Java functionality together with legacy C code. This is done by e.g [14] and [21]. The former demonstrates how generated C source can by integrated with a hard real-time garbage collector, thus maintaining one of the most important benefits of Java, namely garbage collection, while still gaining the efficiency of a compiled language.…”

Section: Related Workmentioning

confidence: 99%

The Java legacy interface

Korsholm

Jean²

2007

Proceedings of the 5th International Workshop on Java Technologies for Real-Time and Embedded Systems - JTRES '07

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The Java Legacy Interface is designed to use Java for encapsulating native legacy code on small embedded platforms. We discuss why existing technologies for encapsulating legacy code (JNI) is not sufficient for an important range of small embedded platforms, and we show how the Java Legacy Interface offers this previously missing functionality.We describe an implementation of the Java Legacy Interface for a particular virtual machine, and how we have used this virtual machine to integrate Java with an existing, commercial, soft real-time, C/C++ legacy platform.

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Section: Related Workmentioning

confidence: 99%

The Java legacy interface

Korsholm

Jean²

2007

Proceedings of the 5th International Workshop on Java Technologies for Real-Time and Embedded Systems - JTRES '07

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“…In the worst case, r n = G n , which corresponds to equality in (15). Applying this to Equation (16) gives…”

Section: Lemma 3 Let H Be the Heapsize And Lmax Be The Maximum Amounmentioning

confidence: 99%

Time-triggered garbage collection

Robertz

Henriksson

2003

SIGPLAN Not.

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The advent of Java and similar languages on the real-time system scene necessitates the development of efficient strategies for scheduling the work of a garbage collector in a non-intrusive way. We propose a scheduling strategy, timetriggered garbage collection, based on assigning the collector a deadline for when it must complete its current cycle.We show that a time-triggered GC with fixed deadline can have equal or better real-time performance than an allocation-triggered GC, which is the standard approach to real-time GC. Also, by using a deadline-based approach, the GC scheduling and, consequently, real-time performance, is independent of a complex and error-prone GC work metric.Time-triggered GC allows a more high-level view on GC scheduling; we look at the GC cycle level rather than at the individual work increments. This makes it possible to schedule GC as any other thread. It is also suitable for making the GC auto-tuning by dynamically adjusting its deadline as necessary.We have implemented our approach in a run-time system for Java and present experimental data to support the practical feasibility of the approach.

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“…This approach leverages existing, mature compiler technology ensuring that high-quality low-level code is generated, as shown by Nilsson, Nilsson and Ekman [23,24]. Here, the primary focus is on threads and real-time garbage collection, which is supported by a run-time system that takes up only 10KB of ROM and 1KB of RAM on an Atmel-based system with 128KB of ROM and 64KB of RAM (leaving 118KB of ROM and 63KB of RAM for the application).…”

Section: Related Workmentioning

confidence: 99%

Compiling java for low-end embedded systems

Schultz

Burgaard²,

Christensen³

et al. 2003

SIGPLAN Not.

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The production of embedded systems is continuously increasing, but developing reusable software for such systems is notoriously difficult, in particular in the case of low-end embedded systems based on 16-bit or 8-bit processors. We have developed a compilation system for executing Java byte code on low-end embedded systems, and we demonstrate how this system permits object-oriented programming techniques to be used on devices with only a few hundred bytes of RAM and a few kilobytes of ROM.We analyze the execution overheads of using object-oriented programming on low-end embedded systems. Based on the conclusion that memory consumption is the major obstacle, we show how the configuration features and optimizations integrated into our compiler can be used to significantly reduce memory requirements. In particular, we use a novel approach based on Java interfaces to control integration of Java programs with the hardware, and demonstrate how aggressive whole-program optimization can significantly reduce the size of the compiled program.

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Real Java for real time - gain and pain

Cited by 11 publications

References 12 publications

The Java legacy interface

The Java legacy interface

Time-triggered garbage collection

Compiling java for low-end embedded systems

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