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//******************************************************************************
//
// File: Program1Clu.java
// Package: ---
// Unit: Class Program1Clu
//
// 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.
//
//******************************************************************************
import edu.rit.pj.Comm;
/**
* Class Program1Clu is the cluster parallel version of the first program
* illustrating parallel computing.
* <P>
* Usage: java -Dpj.np=<I>K</I> Program1Clu <I>x1</I> [ <I>x2</I> . . . ]
* <BR><I>K</I> = Number of parallel processes
* <BR><I>x1</I> = Number to be tested for primality
*
* @author Alan Kaminsky
* @version 05-Aug-2008
*/
public class Program1Clu
{
// Prevent construction.
private Program1Clu()
{
}
// Global variables.
static Comm world;
static int size;
static int rank;
static long x;
static long t1, t2, t3;
// Exported operations.
/**
* Main program.
*/
public static void main
(String[] args)
throws Exception
{
t1 = System.currentTimeMillis();
Comm.init (args);
world = Comm.world();
size = world.size();
rank = world.rank();
x = Long.parseLong (args[rank]);
t2 = System.currentTimeMillis();
isPrime (x);
t3 = System.currentTimeMillis();
System.out.println
("rank = "+rank+" call start = "+(t2-t1)+" msec");
System.out.println
("rank = "+rank+" call finish = "+(t3-t1)+" msec");
}
// Hidden operations.
/**
* Subroutine for one computation. Returns true if x is prime, false
* otherwise.
*/
private static boolean isPrime
(long x)
{
if (x % 2 == 0) return false;
long p = 3;
long psqr = p*p;
while (psqr <= x)
{
if (x % p == 0) return false;
p += 2;
psqr = p*p;
}
return true;
}
}
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