Main.java revision 2ad60cfc28e14ee8f0bb038720836a4696c478ad 
1// Copyright 2007 The Android Open Source Project
2
3/**
4 * Array write speed test.
5 */
6public class Main {
7    /** whether to report times */
8    static boolean timing = false;
9
10    static final int STORAGE_SIZE = 128*1024;
11    static int[] mStorage = new int[STORAGE_SIZE];
12
13    static public void report(long start, long end) {
14        if (! timing) {
15            return;
16        }
17
18        System.out.println("Finished in " + ((end - start) / 1000000.0)
19            + " msec");
20    }
21
22    static void writeArray(int val) {
23        for (int i = STORAGE_SIZE-1; i >= 0; i--)
24            mStorage[i] = val;
25    }
26
27    static void writeTest() {
28        long start, end;
29
30        writeArray(0);  // touch all the memory
31
32        System.out.println("Running writeTest...");
33        start = System.nanoTime();
34        for (int i = 1; i < 20; i++)
35            writeArray(i);
36        end = System.nanoTime();
37
38        report(start, end);
39    }
40
41    static void copyTest() {
42        long start, end;
43
44        // touch once
45        System.arraycopy(mStorage, 0, mStorage,
46            STORAGE_SIZE/2, STORAGE_SIZE/2);
47
48        System.out.println("Running copyTest...");
49        start = System.nanoTime();
50        for (int i = 1; i < 35; i++) {
51            System.arraycopy(mStorage, 0, mStorage,
52                STORAGE_SIZE/2, STORAGE_SIZE/2);
53        }
54        end = System.nanoTime();
55
56        report(start, end);
57    }
58
59    public static void main(String[] args) {
60        if ((args.length >= 1) && args[0].equals("--timing")) {
61            timing = true;
62        }
63
64        writeTest();
65        copyTest();
66        System.out.println("Done!");
67    }
68}
69
70