Tecnicas de otimização para o interpretador da K virtual machine

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

Mobile and customizable devices are increasingly becoming important items in our lives. Cellular phones, personal organizers, service terminaIs have many characteristics in com- mon such as limited functionality, size and cost restrictions and specially are an expanding market. To attend this demanding market, Sun Microsystems Inc. extended the scope of the Java technology, introducing the Java 2 Platform Micro Edition (J2ME). Considering the limitations on this kind of device, performance improvements on the J2ME platform are essential to its development and general acceptance. Several optimization proposals can be found in the technicalliterature focused on J2SE (Java 2 Standard Edition) and J2EE (Java 2 Enterprise Edition) platforms, but almost none aims at the needs of the J2ME platform. The goal of this dissertation is to apply two optimization techniques to the KVM s interpreter. The first technique is based on reducing the number of memory accesses and resulted in a general performance increase from 0.14% to 5.66% and up to 37% for some benchmark programs. The increase on the source code size was only 0.62%, when compared to the original executable size. The second technique is based on reducing some steps of the bytecode interpretation cycle and its general results varied from a per-formance overhead of 0.90% to a performance increase of 5.32%, and up to 18% speedup for some of the benchmark programs. The increase in the source code size varied from 0.0052% to 0.0142%, when compared to the original executable size

ASSUNTO(S)

interpretadores (programas de computador) java (linguagem de programação de computador)

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