NDLI: Superblock compilation and other optimization techniques for a Java-based DBT machine emulator

Content Provider	ACM Digital Library
Author	Spallek, Rainer G. Kaufmann, Marco
Abstract	Superblock compilation techniques such as control flow graph (CFG) or trace compilation have become a widely adopted approach to increase the performance of dynamically compiling virtual machines even further. While this was shown to be successful for many conventional virtual machines, it did not result in a higher performance for Java-based DBT machine emulators so far. These emulators dynamically translate application binaries of a target machine into Java bytecode, which is then eventually compiled into the native code of the emulating host by the Java Virtual Machine (JVM). Successful superblock compilation techniques for this class of emulators must consider the special requirements that result from the two-stage translation as well as the characteristics of the JVM, such as the inability of most Java JIT compilers to handle large bytecode methods efficiently. In this paper, we present a superblock compilation approach for a Java-based DBT machine emulator that generates a performance increase of up to 90 percent and of 32 percent on average. The key idea of our design is to provide a large scope over the control flow of target applications across basic block boundaries for the JVM, while still keeping small bytecode methods for the execution units. In addition, we also present two further optimizations -- interpreter context elimination and program counter elimination -- which increase the emulation performance by 16 percent again. In total, the optimization techniques discussed in this paper provide an average performance gain of 48 percent for the surveyed emulator.
Starting Page	33
Ending Page	40
Page Count	8
File Format	PDF
ISSN	03621340 15581160
DOI	10.1145/2517326.2451521
Journal	ACM SIGPLAN Notices (SIGP)
Volume Number	48
Issue Number	7
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1983-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Java Emulation Superblock Virtualization Optimization
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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