alltoallv.java

MPI for java for Distributed Programming

package mpi.ccl;
/*
 MPI-Java version :
    Sang Lim ([e-mail])
    Northeast Parallel Architectures Center at Syracuse University
    12/2/98
*/

import mpi.*;

public class alltoallv {
  static public void main(String[] args) throws MPIException {
  }

  public alltoallv() {
  }

  public alltoallv(String[] args) throws Exception {
    
    final int MAXLEN = 10;

    int myself,tasks;
    MPI.Init(args);
    myself = MPI.COMM_WORLD.Rank();
    tasks = MPI.COMM_WORLD.Size();

    int root,i=0,j,k,stride=15;
    int out[]    = new int[tasks*stride];
    int in[]     = new int[tasks*stride];
    int sdis[]   = new int[tasks];
    int scount[] = new int[tasks];
    int rdis[]   = new int[tasks];
    int rcount[] = new int[tasks];
    int ans [] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44};
    
    for(i = 0; i < tasks;i++){
       sdis[i] = i*stride;
       scount[i] = 15;
       rdis[i] = i*15;
       rcount[i] = 15;
    }

    if(myself == 0)
       for(i = 0; i < tasks;i++)
          scount[i] = 10;
    
    rcount[0] = 10;
    for(j=0;j<tasks;j++)
       for (i = 0;i < stride;i++){
          out[i+j*stride] = i + myself * stride;
          in[i+j*stride] = 0;
       }

    MPI.COMM_WORLD.Alltoallv(out,0,scount,sdis,MPI.INT,in,0,
		    rcount,rdis,MPI.INT);

/*
     for(i=0; i<tasks*stride; i++)
       if (ans[i]!=in[i])
         System.out.println("recived data : "+in[i]+"at ["+i+
	                    "]  should be : "+ans[i]+" on proc. : "+
			    myself);
*/
    MPI.COMM_WORLD.Barrier();

    if(myself == 0)  {
      System.out.println("Alltoallv TEST COMPLETE");
    }

    MPI.Finalize();
  }
}