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by Paul A. Gray, Vaidy S. Sunderam, Vladimir S. Getov
In First UK Workshop: Java for High Performance Network Computing
http://www.mathcs.emory.edu/icet/sp.ps
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Abstract:
Much of the portability characteristics associated with Java-based programs is attributable to the bytecode representation of Java executables. This aspect of portability and its associated benefits to high-performance computing has been a subject of strong research and debate. In addition, there have been several very successful efforts aimed at extending Java's usefulness as a high-performance programming language by wrapping codes written in other languages such as C or Fortran (native codes) using Java's JNI specification. A mutual aspect of these complementary disciplines which has been overlooked to a large extent is the portability of native codes which have been JNI-wrapped. This paper addresses this aspect of native-code portability by examining the composition of JNI-wrapped programs and the implications this executable form has on portability. Although not entirely platform independent, JNI-wrapped native codes exhibit a significant degree of portability. This portability enables robust, high-performance components to distributed applications written in Java. Two examples presented within the scope of this paper illustrate the portability of Java/JNI programs using the soft-installation mechanism of the IceT framework; one written to take advantage of JNI-wrapped MPI and one written to use a C-based communication library based upon the efficient multi-cast communication package, CCTL. 1
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