mpiJava Implementations

To ``port'' mpiJava, it is necessary to have a native MPI library, a version of the Java Development Toolkit (JDK) and a C compiler. mpiJava consists of two main parts: the MPI Java classes and the C stubs that binds the MPI Java classes to the underlying native MPI implementation. We create these C stubs using JNI--the means by which Java can call and pass parameters to and from a native API, see the next section for details. Figure 4.3 provides a simple schematic view of the software layers involved.

Figure 4.3: Software Layers

To port mpiJava onto a new platform, generally two steps are needed.

• Create a native library out of the compiled JNI C stubs.

• Compile MPI Java in class libraries - ensuring that the correctly named stub library is loaded by the Java System.loadLibrary("mpijava") call in the main source file MPI.java.