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package mpi.dtyp;
import mpi.*;
import java.util.Arrays;
/**
* This example application, is to check and demonstrat the functonality of
* contiguous datatypes. I'm writing an MPJ program by coverting a C program by
* Forest Hoffman at following URL
* http://www.linux-mag.com/2003-04/extreme_01.html
*/
public class Contiguous {
public static int NUM_PARAMS = 12;
public static void main(String args[]) throws Exception {
try {
Contiguous c = new Contiguous(args);
}
catch (Exception e) {
}
}
public Contiguous() {
}
public Contiguous(String[] args) throws Exception {
MPI.Init(args);
int i, rank, size;
double[] params = new double[NUM_PARAMS];
double[] rparams = new double[NUM_PARAMS];
rank = MPI.COMM_WORLD.Rank();
size = MPI.COMM_WORLD.Size();
Datatype parameterType;
/* only the first process reads the parameters */
if (rank == 0) {
for (i = 0; i < NUM_PARAMS; i++) {
params[i] = (double) (i * i);
}
}
parameterType = Datatype.Contiguous(NUM_PARAMS, MPI.DOUBLE);
parameterType.Commit(); // this is doing nothing at the moment.
if (rank == 1) {
MPI.COMM_WORLD.Recv(rparams, 0, 1, parameterType, 0, 10);
System.out.println("recv completed");
for (int j = 0; j < rparams.length; j++) {
System.out.print("rparams[" + j + "]=" + rparams[j] + "\t");
}
/*
* work out what would be test ? if (Arrays.equals(source,dest)) {
* System.out.println("PASS"); }else { System.out.println("\n****");
* System.out.println("FAIL"); System.out.println("****"); }
*/
} else if (rank == 0) {
MPI.COMM_WORLD.Send(params, 0, 1, parameterType, 1, 10);
System.out.println("Send Completed");
}
MPI.COMM_WORLD.Barrier();
MPI.Finalize();
}
}
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