1 // Copyright 2007 The Android Open Source Project 2 3 /** 4 * Array write speed test. 5 */ 6 public 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 report(long start, long end)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 writeArray(int val)22 static void writeArray(int val) { 23 for (int i = STORAGE_SIZE-1; i >= 0; i--) 24 mStorage[i] = val; 25 } 26 writeTest()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 copyTest()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 main(String[] args)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