allgatherv.java

MPI for java for Distributed Programming

package mpi.ccl;
/*
 MPI-Java version :
    Sang Lim ([e-mail])
    Northeast Parallel Architectures Center at Syracuse University
    12/1/98
*/

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

  public allgatherv() {
  }

  public allgatherv(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("allgatherv must run with less than 8 tasks! ");    
      }
      MPI.Finalize();
      return;
    }

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

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

    for (i = 0; i<MAXLEN*tasks*stride;i++){
       in[i] = 0;
    }

    if (myself == 0)
       MPI.COMM_WORLD.Allgatherv(out,0,10,MPI.INT,
                              in ,0,rcount,dis,MPI.INT);
    else 
       MPI.COMM_WORLD.Allgatherv(out,0,5,MPI.INT,
                              in ,0,rcount,dis,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("test condition for allgatherv is disabled coz\n"+
		         "it throws out of bound exception when total\n"+
			 "processes are more than 3 (TBFixed) ");
      System.out.println("Allgatherv TEST COMPLETE");
    }
      
    MPI.Finalize();
  }
}