Exception while calling MPI.Init(args)

Question

I started using MPJExpress recently on windows. Did all the configurations mentioned in the document for windows

Ran this small program :-

import mpi.*;

public class HelloWorld {
    public static void main(String args[]) throws Exception {
        MPI.Init(args);
        int me = MPI.COMM_WORLD.Rank();
        int size = MPI.COMM_WORLD.Size();
        System.out.println("Hi from <" + me + ">");
        MPI.Finalize();
    }
}

And when I run this I get this error :-

Exception in thread "main" mpi.MPIException: Usage: java MPI <myrank> <conf_file> <device_name> conf_file can be, ../conf/xdev.conf <Local>OR http://holly.dsg.port.ac.uk:15000/xdev.conf <Remote>
    at mpi.MPI.Init(MPI.java:232)

there is no xdev.conf file in ../conf/xdev.conf (I also checked previous MPJExpress versions) also http://holly.dsg.port.ac.uk:15000/xdev.conf is not reachable

When I see the code for MPJDev.java I see if

(args.length < 3) {

      throw new MPJDevException("Usage: " + 
        "java MPJDev <myrank> <conf_file> <device_name>"
       +"conf_file can be, ../conf/xdev.conf <Local>"
       +"OR http://holly.dsg.port.ac.uk:15000/xdev.conf <Remote>");

    }

What am I doing wrong, to get the above exception. It looks like args.length is less than 3, so I get the above exception. How can I rectify it ?

No, I run it directly from Eclipse using Run as Java Application. I don't specifically pass any arguments. — aaditya chauhan, Jun 25 '15 at 16:24

score 1 · Accepted Answer · answered Jun 25 '15 at 17:46

1

@aadityachauhan you cannot run MPJ Express applications using Run as Java Application option. For that you need to pass arguments in VM Arguments section. You can look at first half of this Youtube Video Tutorial to run MPJ Express with Eclipse.

answered Jun 25 '15 at 17:46

Aleem

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Exception while calling MPI.Init(args)

1 Answers1