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  1. /*
  2.  java.exe -Xms1024m A
  3.  
  4.  Jagged unopt time 85.958287 msc
  5.  Jagged opt time 602.58672 msc
  6.  Simple unopt time 69.588572 msc
  7.  Simple opt time 412.327974 msc
  8. */
  9. class A {
  10.  
  11.     private final static int n = 8000;
  12.     private final static int g[][] = new int[n][n];
  13.     private final static int a[] = new int[n*n];
  14.  
  15. public static void main(String[] args) throws Exception {
  16.  
  17.     for(int i=0;i<10;i++) {
  18.       testRun1(args); 
  19.       testRun2(args); 
  20.       testRun3(args); 
  21.       testRun4(args); 
  22.       System.out.println();
  23.       if(i==3) Thread.sleep(1000);
  24.     }
  25. }
  26. public static void testRun1(String[] args) { 
  27.     long st, en;
  28.  
  29.     // one
  30.     st = System.nanoTime();
  31.     for(int i = 0; i < n; i++) {
  32.     for(int j = 0; j < n; j++) {
  33.     g[i][j] = i + j + i*n + j*n;
  34.     }
  35.     }
  36.     en = System.nanoTime();
  37.     System.out.println("Jagged unopt time " + (en - st)/1000000.d + " msc");
  38. }
  39. public static void testRun2(String[] args) {
  40.     long st, en;
  41.  
  42.     // two
  43.     st = System.nanoTime();
  44.     for(int i = 0; i < n; i++) {
  45.     g[i][i] = i + i + i*n + i*n;
  46.     for(int j = 0; j < i; j++) {
  47.     g[j][i] = g[i][j] = i + j + i*n + j*n;
  48.     }
  49.     }
  50.     en = System.nanoTime();
  51.     System.out.println("Jagged opt time " + (en - st)/1000000.d + " msc");
  52.     }
  53.  
  54. public static void testRun3(String[] args) {
  55.     long st, en;
  56.  
  57.     // two
  58.     st = System.nanoTime();
  59.     for(int i = 0; i < n; i++) {
  60.         final int in = i*n;
  61.         for(int j = 0; j < n; j++) {
  62.           final int jn = j*n;
  63.           a[in + j] = in + j + i + jn;
  64.         }
  65.     }
  66.     en = System.nanoTime();
  67.     System.out.println("Simple unopt time " + (en - st)/1000000.d + " msc");
  68.     }
  69.  
  70. public static void testRun4(String[] args) {
  71.     long st, en;
  72.  
  73.     // two
  74.     st = System.nanoTime();
  75.     for(int i = 0; i < n; i++) {
  76.         final int in = i*n;
  77.         a[in + i] = in + i + i + in;
  78.         for(int j = 0; j < i; j++) {
  79.            final int jn = j*n;
  80.            a[jn + i] = a[in + j] = in + i + j + jn;
  81.         }
  82.     }
  83.     en = System.nanoTime();
  84.     System.out.println("Simple opt time " + (en - st)/1000000.d + " msc");
  85.     }
  86. }
Runtime error #stdin #stdout #stderr 0.64s 380160KB
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Standard input is empty
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Standard output is empty
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Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
	at A.<clinit>(Main.java:13)
https://ideone.com/k8h9k0
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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