Type of Document	Dissertation
Author	Lim, Sang Boem
URN	etd-09222003-190515
Title	Platforms For HPJAVA: Runtime Support For Scalable Programming In JAVA
Degree	Doctor of Philosophy
Department	Computer Science, Department of
Advisory Committee	Advisor Name Title Gordon Erlebacher Committee Chair DanielG . Schwartz Committee Member Geoffrey C. Fox Committee Member Larry Dennis Committee Member Robert A. van Engelen Committee Member
Keywords	Development Of Scientific Software JAVA Network-Aware Programming Language
Date of Defense	2003-08-02
Availability	unrestricted
Abstract The dissertation research is concerned with enabling parallel, high-performance computation —in particular development of scientific software in the network-aware programming language, Java. Traditionally, this kind of computing was done in Fortran. Arguably, Fortran is becoming a marginalized language, with limited economic incentive for vendors to produce modern development environments, optimizing compilers for new hardware, or other kinds of associated software expected of by today’s programmers. Hence, Java looks like a very promising alternative for the future. The dissertation will discuss in detail a particular environment called HPJava. HPJava is the environment for parallel programming—especially data-parallel scientific programming– in Java. Our HPJava is based around a small set of language extensions designed to support parallel computation with distributed arrays, plus a set of communication libraries. In particular the dissertation work will concentrate on issues related to the development of effcient run time support software for parallel languages extending an underlying object oriented language. Two characteristic run-time communication libraries of HPJava are developed as an application level library and device level library. A high-level communication API, Adlib, is developed as an application level communication library suitable for our HPJava. This communication library supports collective operations on distributed arrays. We include Java Object as one of the Adlib communication data types. So we fully support communication of intrinsic Java types, including primitive types, and Java object types. The Adlib library is developed on top of low-level communication library called mpjdev, designed to interface efficiently to the Java execution environment (virtual machine). The mpjdev API is a device level underlying communication library for HPJava. This library is developed to perform actual communication between processes. The mpjdev API is developed with HPJava in mind, but it is a standalone library and could be used by other systems. This can be implementing portably on network platforms and effciently on parallel hardware. The dissertation describes the novel issues in the interface and implementation of these libraries on different platforms, and gives comprehensive benchmark results on a parallel platform. All software developed in this project is available for free download from www.hpjava.org.
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