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
#	User	Rev	Content
1	dl	1.1
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			}