New Restructuring and Optimization Techniques for Java Virtual Machine

• Main Authors: Fuh-Gwo Chen, 陳富國
• Other Authors: Ting-Wei Hou
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/30739223448346314719

博士 === 國立成功大學 === 工程科學系碩博士班 === 96 === The dissertation focuses on accelerating, memory-saving, and restructuring techniques for application virtual machines using Java virtual machine (JVM) as an example. Our JVM, Gabi (the assonance of ‘café’ in Taiwanese), and later called ES-JVM, where ES-JVM is both the JVM for Embedded System and the JVM developed by Department of Engineering Science, National Cheng Kung University, was developed from scratch as a foundation of later works. A distributed version of ES-JVM was integrated into the distributed-shared memory system, Teamster (developed by department of EE, NCKU), where the multiplication of 512x512 matrices was accelerated by a factor of 3.83 on a four-node cluster. An anomaly was found that using GCC source-code-level register allocation to assign important variables of a program to hard registers would not improve performance. A new restructuring technique, instruction-coated translation, was developed to improve the cohesion of a directly threaded interpreter from communication cohesion to functional cohesion. A new technique, called Shortcode threading, was developed to have a comparable speedup to a directly threading with less memory space: one half in a 32-bit addressing machine and one quarter in a 64-bit addressing machine, respectively.