1 /*
2  * Copyright (C) 2007 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 /**
18  * Array write speed test.
19  */
20 public class Main {
21     /** whether to report times */
22     static boolean timing = false;
23 
24     static final int STORAGE_SIZE = 128*1024;
25     static int[] mStorage = new int[STORAGE_SIZE];
26 
report(long start, long end)27     static public void report(long start, long end) {
28         if (! timing) {
29             return;
30         }
31 
32         System.out.println("Finished in " + ((end - start) / 1000000.0)
33             + " msec");
34     }
35 
writeArray(int val)36     static void writeArray(int val) {
37         for (int i = STORAGE_SIZE-1; i >= 0; i--)
38             mStorage[i] = val;
39     }
40 
writeTest()41     static void writeTest() {
42         long start, end;
43 
44         writeArray(0);  // touch all the memory
45 
46         System.out.println("Running writeTest...");
47         start = System.nanoTime();
48         for (int i = 1; i < 20; i++)
49             writeArray(i);
50         end = System.nanoTime();
51 
52         report(start, end);
53     }
54 
copyTest()55     static void copyTest() {
56         long start, end;
57 
58         // touch once
59         System.arraycopy(mStorage, 0, mStorage,
60             STORAGE_SIZE/2, STORAGE_SIZE/2);
61 
62         System.out.println("Running copyTest...");
63         start = System.nanoTime();
64         for (int i = 1; i < 35; i++) {
65             System.arraycopy(mStorage, 0, mStorage,
66                 STORAGE_SIZE/2, STORAGE_SIZE/2);
67         }
68         end = System.nanoTime();
69 
70         report(start, end);
71     }
72 
array_028()73     public static void array_028() {
74         writeTest();
75         copyTest();
76         System.out.println("Done!");
77     }
78 
main(String[] args)79     public static void main(String[] args) {
80         if ((args.length >= 1) && args[0].equals("--timing")) {
81             timing = true;
82         }
83         array_028();
84     }
85 }
86