allgathervo.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
    12/1/98
*****************************************************************************/

import mpi.*;
 
public class allgathervO {
  static public void main(String[] args) throws MPIException {
  }

  public allgathervO() {
  }

  public allgathervO(String[] args) throws Exception {
    
    final int MAXLEN = 10;
 
    int root,i,j,k;
    int myself,tasks,stride=15;
 
    MPI.Init(args);
    myself = MPI.COMM_WORLD.Rank();
    tasks = MPI.COMM_WORLD.Size();

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

    int out[][]   = new int[MAXLEN][MAXLEN];
    int in[][]    = new int[MAXLEN*stride*tasks][MAXLEN];
    int dis[]    = new int[MAXLEN];
    int rcount[] = new int[MAXLEN];
    int ans[] = {1,2,3, 4, 5, 6, 7, 8, 9, 10, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,1, 2, 3, 4, 5, 0 ,0, 0, 0, 0,  0, 0, 0, 0, 0};

    for (i = 0; i<MAXLEN;i++)
      for (j = 0; j < MAXLEN; j++){
        dis[i] = i*stride;
        rcount[i] = 5;
        out[j][i] = j+1;
    }
    rcount[0] = 10;

    for (i = 0; i<MAXLEN*tasks*stride;i++)
      for (j = 0; j < MAXLEN; j++)
       in[i][j] = 0;
    
    if (myself == 0)
       MPI.COMM_WORLD.Allgatherv(out,0,10,MPI.OBJECT,
                              in ,0,rcount,dis,MPI.OBJECT);
    else 
       MPI.COMM_WORLD.Allgatherv(out,0,5,MPI.OBJECT,
                              in ,0,rcount,dis,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();
    }
*/
    if(myself == 0)  System.out.println("AllgathervO TEST COMPLETE");
    MPI.Finalize();
  }
}