Abstract

Compilers are tools that generate efficient mappings from programs to machines A Java "Just In Time" runs as part of an application, and as such, it must be fast and efficient in its use of memory. To achieve good performance and further optimize code generation, the present invention introduces a method for optimizing Java performance using precompiled code. The method of the present invention first monitors the performance of program code during program execution. Then a list of program functions for possible native code compilation is created. The list may be created based upon static and dynamic analysis of the computer program. A plurality of program functions from said list of program functions is selected for optimization and native compilation. The selected program functions are precompiled into native program functions. The present invention also allows the precompiled native code reverted so that a user could explore the performance tuning until satisfactory.

Other References

• Bothner, "A Gcc-basedJava Implementation", IEEE 1997, pp. 174-178.
• Cierniak et al., "Briki: An Optimizing Java compiler", Compcon Proceedings,IEEE, 1997, pp. 179-184.
• Hsieh et al., "Java Bytecode to Native Code Translation: The Caffeine Prototype and Preliminary Results", IEEE, 1996, pp. 90-97.
• Hsieh et al., "Optimizing NET Compilers for Improved Java Performance", IEEE 1997, pp. 67-75.
• James Gosling, et al., The Java Language Specification, Published by Addison-Wesley, 1996, pp. 29-49
• Tim Lindholm, et al., The Java Virtual Machine Specification, Published by Addison-Wesley, 1997, pp. 57-82
• Alfred V. Aho, et al., Compilers-Principles, Techniques, and Tools, Published by Addsion-Wesley, 1988, pp. 1-24
• Steven S. Muchnick, Advanced Compiler Design & Implementation, Published by Morgan Kaufmann, 1997, pp. 1-18, 319-328
• Douglas Kramer, The Java Platform-A White Paper, Published by Javasoft, 1996, pp. 6-24
• P. Tyma; "Tuning Java Performance", Dr. Dobb's Journal, vol. 21, No. 4, pp. 52-58
• D. Bell; "Make Java Fast: Optimaze", Javaworld (online). Retrieved from : Jun. 22, 1999
• Jansen, et al.; "Security and Dynamic Class Loading in Java: a Formalisation" IEEE/IEE Electronic Library (online)
• Aho, et al.; "Compilers, Principles, Techniques, and Tools", Addison-Wesley Publishing Co., Ch. 9 and 10
• Ciemiek, et al.; "Briki: An Optimizing Java Compiler", IEEE/IEE Electronic Library (Online) Proceedings of IEEE Compcon '97, pp. 179-184
• E. Armstrong, "HotSpot: A New Breed of Virtual Machine", Javaworld (online). Retrieved from on Jun. 22, 1999
• Bacon, et al.; "Compiler Transformations and High-Performance Computing", ACM Computing Surveys, vol. 25, No. 4, 12/94, pp. 345-420
• Bothner, "A Gcc-Based Java Implementation", Cygnus Solutions, IEEE, 1963, pp. 174-17