/*
* Aleph Toolkit
*
* Copyright 1999, Brown University, Providence, RI.
*
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose other than its incorporation into a commercial
* product is hereby granted without fee, provided that the above copyright
* notice appear in all copies and that both that copyright notice and this
* permission notice appear in supporting documentation, and that the name of
* Brown University not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior permission.
*
* BROWN UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ANY
* PARTICULAR PURPOSE. IN NO EVENT SHALL BROWN UNIVERSITY BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE
*/
package aleph.examples;
import aleph.Aleph;
import aleph.AlephException;
import aleph.GlobalObject;
import aleph.Join;
import aleph.PE;
import aleph.RemoteThread;
import java.io.Serializable;
import java.util.Iterator;
/**
* This example stresses Aleph's ability to manage enormous global objects.
* @author Maurice Herlihy
* @date August 1997
**/
public class BigCounter implements Serializable{
public long[] value;
public BigCounter() {
value = new long[aleph.comm.udp.Constants.MAX_DATA_SIZE]; // requires multiple datagram packets
value[0] = 0;
}
public static void main(String[] args) {
int count = 1;
try {
if ( args.length > 0)
count = Integer.parseInt(args[0]);
} catch (NumberFormatException e) {
Aleph.error("usage: BigCounter <#increments>");
Aleph.exit();
}
GlobalObject global = new GlobalObject( new BigCounter() );
UserThread fork = new UserThread(count, global);
Join join = new Join();
long start = System.currentTimeMillis();
for (Iterator e = PE.allPEs(); e.hasNext(); )
fork.start((PE) e.next(), join);
join.waitFor();
BigCounter counter = (BigCounter) global.open("r");
System.out.println("Final value is " + counter.value[0]);
System.out.println("Elapsed time: " +
((double) (System.currentTimeMillis() - start)) / 1000.0
+ " seconds");
}
static class UserThread extends RemoteThread {
GlobalObject global;
int count;
UserThread(int count, GlobalObject global) {
this.count = count;
this.global = global;
}
public void run() {
try{
for (int i = 0; i < count; i++) {
BigCounter counter = (BigCounter) global.open("w");
counter.value[0]++;
global.release();
}
} catch (AlephException e) {}
}
}
}