The article discusses the application of HPJava language for parallel computing and various rules about use of distributed arrays in HPJava programes. We illustrated how to build a Beowulf system under Linux and HPJava and use matrix multiplication parallel algorithm module design to test this Beowulf system.

Application of HPJava in parallel computing

/pdf/a-high-level-spmd-programming-model-hpspmd-and-its-java-2ej15h6qmw.pdf

A High Level SPMD Programming Model: HPspmd and its Java Language Binding

/pdf/platforms-for-hpjava-runtime-support-for-scalable-44lgm8ywr4.pdf

Platforms for hpjava: runtime support for scalable

We present designs for Java interfaces to High Performance Computing softwares, and research implementation issues associated with their development. We investigate various issues and options for parallel programming in Java—data parallelism and message passing libraries. We discuss motivations for introducing HPJava, an HPspmd programming model. 
As part of the larger environment of HPJava, we have designed and developed mpiJava, an object-oriented Java interface to MPI. This has been implemented by “native methods” wrappers around some pre-existing MPI implementation. We describe the design of the mpiJava API and the issues associated with its development. We present and then discuss performance measurements made of communications bandwidth and latency to compare mpiJava with C and Fortran bindings of MPI. We discuss adoption of the Java object serialization model in mpiJava for marshalling general communication data in MPI-like APIs. This approach is compared with a Java transcription of the standard MPI derived datatype mechanism. We evaluate overheads introduced by object serialization in mpiJava, then present optimized methods that reduce serialization overheads. We present graphical mpiJava Potts model simulation and evaluate the performance of Ising model simulation using Metropolis and Swendsen-Wang cluster algorithms. Benchmark results are compared with native parallel and sequential codes. 
We have publically released mpiJava on a Web site. This includes complete source, makefiles, configuration scripts, compiled libraries for WMPI, test codes (based on the IBM MPI test suite), example applications, javadoc documentation, and installation and usage notes.

Object-based message passing in high performance computing using java

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 efficient 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 efficiently 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.

Platforms for hpjava: runtime support for scalable programming in java

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Application of HPJava in parallel computing

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A High Level SPMD Programming Model: HPspmd and its Java Language Binding

Platforms for hpjava: runtime support for scalable

Object-based message passing in high performance computing using java

Platforms for hpjava: runtime support for scalable programming in java

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