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Java MPIAny of Message Passing Interface standarts implies procedural techniques of implementation. So, in order to implement it on Java using all its strong abilities and simply interesting features I was forced to represent ideas of classical MPI in accordance with object-oriented methods. Because of Java peculiarities some of MPI chapters are not present in given implementation. "Virtual Topologies" is the one exception. It is not implemented because i have not enough experience in Java for implement it well.

Running programsMessage Passing of Java implementation relies on RMI technology so that policy files are necessary. Command line option for java to attach policy is

-Djava.security.policy=somefilename

If your PC has more then one NIC you should explain to Java what interface program will use:

-Djava.rmi.server.hostname=yourhostname

mpiManagermpiManager is an utility that allows you to start java programs on different hosts simultaneously. This utility consists of two programs: mpiDaemon and mpiLoader. Daemons implements

public interface mpiStubInterface extends Remote {

public int mount (String taskpath)
throws RemoteException;

public void run (int taskhandle,List args)
throws RemoteException;

public boolean isRunning (int taskhandle)
throws RemoteException;

public void stop (int taskhandle)
throws RemoteException;

public void free (int taskhandle)
throws RemoteException;
}that let every Loader manipulate java-executable files remotely. Scheme:

mpiDaemons are started on each node Java program is copied to mpiManager\tasks on each node mpiLoader from one node starts all copies of programs, one for each node

What now?Now planning of testing functionality and performance takes place. Besides, preparing updates for implementation is also in progress.

Tags

java mpi parallelprogramming rmi

In a Nutshell, javampi...

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