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//******************************************************************************
//
// File: Test20.java
// Package: edu.rit.pj.test
// Unit: Class edu.rit.pj.test.Test20
//
// 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.pj.Comm;
import edu.rit.pj.LongForLoop;
import edu.rit.pj.ParallelRegion;
import edu.rit.pj.ParallelTeam;
import edu.rit.pj.reduction.IntegerOp;
import edu.rit.pj.replica.ReplicatedInteger;
import edu.rit.util.LongRange;
import edu.rit.util.Random;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.util.Map;
/**
* Class Test20 is a hybrid parallel unit test program for class {@linkplain
* edu.rit.pj.replica.ReplicatedInteger}. The program runs on a number of
* processors in the cluster with a number of threads in each process. The
* program generates a sequence of random integers. Each random integer updates
* a ReplicatedInteger variable using minimum as the reduction operator; thus,
* the variable always holds the smallest random integer. Once all processes
* have finished, each process prints the value of its variable.
* <P>
* Usage: java -Dpj.np=<I>np</I> -Dpj.nt=<I>nt</I> edu.rit.pj.test.Test20
* <I>seed</I> <I>N</I>
* <BR><I>np</I> = Number of processes
* <BR><I>nt</I> = Number of CPUs per process
* <BR><I>seed</I> = Random seed
* <BR><I>N</I> = Number of random integers
*
* @author Alan Kaminsky
* @version 12-Sep-2008
*/
public class Test20
{
// Prevent construction.
private Test20()
{
}
// Global variables.
// World communicator.
static Comm world;
static int size;
static int rank;
// Command line arguments.
static long seed;
static long N;
// Replicated, shared reduction variable.
static ReplicatedInteger littlest;
// Range of iterations for this process.
static LongRange range;
// 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 != 2) usage();
seed = Long.parseLong (args[0]);
N = Long.parseLong (args[1]);
// Set up replicated, shared reduction variable.
littlest = new ReplicatedInteger
(/*op */ IntegerOp.MINIMUM,
/*initialValue*/ Integer.MAX_VALUE,
/*tag */ 1);
// Partition computation among processes.
range = new LongRange (0, N-1) .subrange (size, rank);
// Perform computation in parallel threads.
new ParallelTeam().execute (new ParallelRegion()
{
public void run() throws Exception
{
execute (range.lb(), range.ub(), new LongForLoop()
{
Random prng = Random.getInstance (seed);
public void run (long first, long last) throws Exception
{
prng.setSeed (seed);
prng.skip (first);
for (long i = first; i <= last; ++ i)
{
littlest.reduce (prng.nextInt (Integer.MAX_VALUE));
}
}
});
}
});
// Wait until all processes have finished.
world.barrier();
// Wait two more seconds to let any in-progress updates finish.
Thread.sleep (2000L);
// Print replicated, shared reduction variable.
System.out.println ("littlest = "+littlest+" ("+rank+")");
}
// Hidden operations.
/**
* Print a usage message and exit.
*/
private static void usage()
{
System.err.println ("Usage: java -Dpj.np=<np> -Dpj.nt=<nt> edu.rit.pj.test.Test20 <seed> <N>");
System.err.println ("<np> = Number of processes");
System.err.println ("<nt> = Number of CPUs per process");
System.err.println ("<seed> = Random seed");
System.err.println ("<N> = Number of random integers");
System.exit (1);
}
}
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