ContendedTest.java

/*
 * Copyright (c) 2013,2014 Scott Oaks. All rights reserved.
 */

package net.sdo;

public class ContendedTest extends Thread {
    private static class DataHolder {
        private volatile long l1 = 0;
        private volatile long l2 = 0;
        private volatile long l3 = 0;
        private volatile long l4 = 0;
    }

    private static DataHolder dh = new DataHolder();
    private static long nLoops;

    public ContendedTest(Runnable r) {
        super(r);
    }

    public static void main(String[] args) throws Exception {
        nLoops = Long.parseLong(args[0]);
	int nThreads = Integer.parseInt(args[1]);
        ContendedTest[] tests = new ContendedTest[4];
        tests[0] = new ContendedTest(() -> {
            for (long i = 0; i < nLoops; i++) {
                dh.l1 += i;
            }
        });
        tests[1] = new ContendedTest(() -> {
            for (long i = 0; i < nLoops; i++) {
                dh.l2 += i;
            }
        });
        tests[2] = new ContendedTest(() -> {
            for (long i = 0; i < nLoops; i++) {
                dh.l3 += i;
            }
        });
        tests[3] = new ContendedTest(() -> {
            for (long i = 0; i < nLoops; i++) {
                dh.l4 += i;
            }
        });
        long then = System.currentTimeMillis();
        for (int i = 0; i < nThreads; i++) {
            tests[i].start();
        }
        for (int i = 0; i < nThreads; i++) {
            tests[i].join();
        }
        long now = System.currentTimeMillis();
        System.out.println("Duration: " + (now - then) + " ms");
    }
}