test/loops/Sync100M.java


class Sync100M {
    public static void main(String[] args) throws Exception {
        int x = loop((int)System.nanoTime(), 100000);
        x = loop(x, 100000);
        x = loop(x, 100000);
        long start = System.nanoTime();
        x = loop(x, 100000000);
        if (x == 0) System.out.print(" ");
        long time = System.nanoTime() - start;
        double secs = (double)time / 1000000000.0;
        System.out.println("time: " + secs);
        start = System.nanoTime();
        x = loop(x, 100000000);
        if (x == 0) System.out.print(" ");
        time = System.nanoTime() - start;
        secs = (double)time / 1000000000.0;
        System.out.println("time: " + secs);

    }

    static final Object obj = new Object();
    
    static int loop(int x, int iters) {
        for (int i = iters; i > 0; --i) {
            synchronized(obj) {
                x = x * 134775813 + 1;
            }
        }
        return x;
    }
    
}
Revision:	1.1
Committed:	Mon May 2 19:19:38 2005 UTC (19 years ago) by dl
Branch:	MAIN
Log Message:	Put misc performance tests into CVS
#	Content
1
2	class Sync100M {
3	public static void main(String[] args) throws Exception {
4	int x = loop((int)System.nanoTime(), 100000);
5	x = loop(x, 100000);
6	x = loop(x, 100000);
7	long start = System.nanoTime();
8	x = loop(x, 100000000);
9	if (x == 0) System.out.print(" ");
10	long time = System.nanoTime() - start;
11	double secs = (double)time / 1000000000.0;
12	System.out.println("time: " + secs);
13	start = System.nanoTime();
14	x = loop(x, 100000000);
15	if (x == 0) System.out.print(" ");
16	time = System.nanoTime() - start;
17	secs = (double)time / 1000000000.0;
18	System.out.println("time: " + secs);
19
20	}
21
22	static final Object obj = new Object();
23
24	static int loop(int x, int iters) {
25	for (int i = iters; i > 0; --i) {
26	synchronized(obj) {
27	x = x * 134775813 + 1;
28	}
29	}
30	return x;
31	}
32
33	}