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