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JavaMPI and mpiJava: A Comprehensive Java API for High-Performance Computing with MPI

This document reviews mpiJava, a Java API for MPI that provides a robust interface consistent with MPI 1.1 and based on the MPI 2 C++ standard. Developed in late 1997, it features good performance for large data transfers and includes a comprehensive test suite adapted from IBM's MPI suite. The implementation through JNI allows tight integration with native MPI libraries. The API supports object-oriented programming paradigms to facilitate the development of high-performance distributed applications in Java.

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JavaMPI and mpiJava: A Comprehensive Java API for High-Performance Computing with MPI

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  1. mpiJava Mark.Baker@Computer.Org

  2. Related projects • mpiJava (Syracuse) • JavaMPI (Getov et al, Westminster) • JMPI (MPI Software Technology) • MPIJ (Judd et al, Brigham Young) • jmpi (Dincer et al)

  3. The mpiJava wrapper • Implements a Java API for MPI suggested in late ‘97. • Good Performance on large data transfers • Tied to native mpi C implementation

  4. mpiJava features. • Fully featured Java interface to MPI 1.1 • Object-oriented API based on MPI 2 standard C++ interface • Initial implementation through JNI to native MPI • Comprehensive test suite translated from IBM MPI suite

  5. MPIprog.java Import mpi.*; JNI C Interface Native Library (MPI) mpiJava - Software Layers

  6. Class hierarchy

  7. Minimal mpiJava program import mpi.* class Hello { static public void main(String[] args) { MPI.Init(args) ; int myrank = MPI.COMM_WORLD.Rank() ; if(myrank == 0) { char[] message = “Hello, there”.toCharArray() ; MPI.COMM_WORLD.Send(message, 0, message.length, MPI.CHAR, 1, 99) ; } else { char[] message = new char [20] ; MPI.COMM_WORLD.Recv(message, 0, 20, MPI.CHAR, 0, 99) ; System.out.println(“received:” + new String(message) + “:”) ; } MPI.Finalize() ; } }

  8. mpiJava performance

  9. MPI datatypes • Send and receive members of Comm: void send(Object buf, int offset, int count, Datatype type, int dst, int tag) ; Status recv(Object buf, int offset, int count, Datatype type, int src, int tag) ; • buf must be an array. offset is the element where message starts. Datatype class describes type of elements.

  10. Basic Datatypes

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