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//******************************************************************************
//
// File: Test15.java
// Package: edu.rit.pj.test
// Unit: Class edu.rit.pj.test.Test15
//
// This Java source file is copyright (C) 2008 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
// software; you can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// PJ is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.pj.test;
import edu.rit.mp.IntegerBuf;
import edu.rit.pj.Comm;
import edu.rit.util.Range;
/**
* Class Test15 is a unit test main program for the all-gather collective
* communication operation in class {@linkplain edu.rit.pj.Comm}. The program
* runs on a number of processors in the cluster. Each process sets up an array
* of data and fills in one slice; the processes all-gather the array slices
* together; and each process prints its final array.
* <P>
* Usage: java -Dpj.np=<I>K</I> edu.rit.pj.test.Test15 <I>N</I>
* <BR><I>K</I> = Number of parallel processes
* <BR><I>N</I> = Array length
*
* @author Alan Kaminsky
* @version 18-Mar-2008
*/
public class Test15
{
// Prevent construction.
private Test15()
{
}
// Global variables.
// World communicator.
static Comm world;
static int size;
static int rank;
// Command line arguments.
static int N;
// Array.
static int[] data;
// Communication buffers.
static IntegerBuf[] buf;
// Main program.
/**
* Unit test main program.
*/
public static void main
(String[] args)
throws Exception
{
// Initialize middleware.
Comm.init (args);
world = Comm.world();
size = world.size();
rank = world.rank();
// Parse command line arguments.
if (args.length != 1) usage();
N = Integer.parseInt (args[0]);
// Set up array.
data = new int [N];
for (int i = 0; i < N; ++ i)
{
data[i] = 100 * rank + i;
}
// Print array before all-gather.
System.out.print (rank);
System.out.print (" before:");
for (int i = 0; i < N; ++ i)
{
System.out.print (' ');
System.out.print (data[i]);
}
System.out.println();
// Set up communication buffers.
buf =
IntegerBuf.sliceBuffers
(data,
new Range (0, N-1) .subranges (size));
// All-gather.
world.allGather (buf[rank], buf);
// Print array after all-gather.
System.out.print (rank);
System.out.print (" after:");
for (int i = 0; i < N; ++ i)
{
System.out.print (' ');
System.out.print (data[i]);
}
System.out.println();
}
/**
* Print a usage message and exit.
*/
private static void usage()
{
System.err.println ("Usage: java -Dpj.np=<K> edu.rit.pj.test.Test15 <N>");
System.err.println ("<K> = Number of parallel processes");
System.err.println ("<N> = Array length");
System.exit (1);
}
}
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