An IP Core for Embedded Java Systems

Uhrig, Sascha; Mische, Jörg; Ungerer, Theo

doi:10.1007/978-3-540-73625-7_28

Cited by 18 publications

(20 citation statements)

References 4 publications

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“…A method cache is also integrated in the embedded Java processor SHAP [23] and considered in jamuth [32] as a time-predictable caching solution. 1 With a method cache, only invoke and return bytecodes can result in a cache miss.…”

Section: Methods Cachementioning

confidence: 99%

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Cross‐profiling for Java processors

et al. 2009

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Performance evaluation of embedded software is essential in an early development phase so as to ensure that the software will run on the embedded device's limited computing resources. Prevailing approaches either require the deployment of the software on the embedded target, which can be tedious and may be impossible in an early development phase, or rely on simulation, which can be very slow. In this paper, we introduce a customizable cross-profiling framework for embedded Java processors, including processors featuring a method cache. The developer profiles the embedded software in the host environment, completely decoupled from the target system, on any standard Java Virtual Machine, but the generated profiles represent the execution time metric of the target system. Our cross-profiling framework is based on bytecode instrumentation. We identify several pointcuts in the execution of bytecode that need to be instrumented in order to estimate the CPU cycle consumption on the target system. An evaluation using the JOP embedded Java processor as target confirms that our approach reconciles high profile accuracy with moderate overhead. Our cross-profiling framework also enables the rapid evaluation of the performance impact of possible optimizations, such as different caching strategies.

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Section: Methods Cachementioning

confidence: 99%

“…Komodo [19] is a multithreaded Java processor intended as a basis for research on real-time scheduling on a multithreaded microcontroller. The follow-up project, jamuth [32], is a commercial version of Komodo.…”

Section: The Java Processor Jopmentioning

confidence: 99%

Cross‐profiling for Java processors

et al. 2009

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“…The Java processor jamuth is the follow-up project to Komodo [65], and is targeted for commercial embedded applications with Altera FPGAs. jamuth is well integrated in the Alter's System-on-a-Programmable-Chip builder.…”

Section: Komodo and Jamuthmentioning

confidence: 99%

“…Therefore, small methods do not add any additional latency to the invoke or return bytecodes. The method cache is also integrated in the embedded Java processor SHAP [42] and considered for jamuth [65] as a timepredictable caching solution. 1 JOP has it's own notion of real-time threads that are scheduled with a preemptive, priority based scheduler.…”

Section: Java Optimized Processor (Jop)mentioning

confidence: 99%

“…Based on CLDC, the real-time specification for Java (RTSJ) [8] defines a new memory model and strengthens the scheduling guarantees to enable Java for real-time systems. Safety-critical Java (SCJ) [30] defines a subset of RTSJ for safety-critical [31,63] Xilinx FPGA 15600 LC 14 KB 30 2002 FemtoJava [6] Xilinx FPGA 2700 LC 0.5 KB 56 2003 JOP [46,50] Altera, Xilinx FPGA 3000 LC 4 KB 100 2003 jamuth [65] Altera FPGA 33 2007 BlueJEP [15] Xilinx FPGA 6900 LC 0 KB 85 2007 SHAP [72,73] Altera, Xilinx systems. Most Java processors base the Java library on CLDC or a subset of it.…”

Section: Introductionmentioning

confidence: 99%

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