alltoallvo.java

MPI for java for Distributed Programming

package mpi.ccl_ObjSer;
/*
 MPI-Java version :
    Sang Lim ([e-mail])
    Northeast Parallel Architectures Center at Syracuse University
    12/3/98
*/

import mpi.*;

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

  public alltoallvO() {
  }

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

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

    if(tasks > 8) {
      if(myself == 0) 
        System.out.println("alltoallvO must run with fewer than 8 tasks!");
      MPI.Finalize();
      return;
    }


    int root,i=0,j,k,stride=15;
    int out[][]    = new int[tasks*stride][MAXLEN];
    int in[][]     = new int[tasks*stride][MAXLEN];
    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++)
        for(k = 0; k< MAXLEN; k++){
          out[i+j*stride][k] = i + myself * stride;
          in[i+j*stride][k] = 0;
        }
       

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

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