| Summary: | 碩士 === 國立交通大學 === 資訊工程系所 === 93 === Multimedia Home Platform (MHP) is the open middleware system for interactive
television and related interactive home entertainment designed by the Digital Video
Broadcasting (DVB) project. They use Java as the common programming language and
embed the Java Virtual Machine (VM) that provides a stable and cross-platform java
runtime environment in the system software layer. A hardware/software co-design approach
makes Java VM more flexible and powerful, but it still suffers from the inefficiency of java
system. Typical dynamic code optimization can save method lookup and constant pool
searching time using the runtime information known in the first time we execute it.
However, in such kind of embedded system, it is very expensive due to the overhead of
external memory modification. In this thesis, we propose a new hardware/software
co-design dynamic code optimization schema for this kind of approach that can
significantly improve the efficiency of Java program execution. By analyzing the execution
frequency of Java code segment, we can dynamically decide if the dynamic code
optimization is needed. This approach can also cut down the power consumption with less
microcode execution cycles and less external memory access. We implement this
architecture on Java Optimized Processor (JOP) and simulate on Xilinx Spartan-3
developing board. Experiment Result shows that this proposed dynamic code optimization
schema for Java VM hardware/software co-design of DVB-MHP terminal has 13.8%
average speedup, 10.4% less microcode execution cycles and 11.1% less external memory
access than the original system.
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