js/tests/js1_5/Array/regress-101964.js

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  38
  39 /*
  40  * Date: 27 September 2001
  41  *
  42  * SUMMARY: Performance: truncating even very large arrays should be fast!
  43  * See http://bugzilla.mozilla.org/show_bug.cgi?id=101964
  44  *
  45  * Adjust this testcase if necessary. The FAST constant defines
  46  * an upper bound in milliseconds for any truncation to take.
  47  */
  48 //-----------------------------------------------------------------------------
  49 var gTestfile = 'regress-101964.js';
  50 var UBound = 0;
  51 var BUGNUMBER = 101964;
  52 var summary = 'Performance: truncating even very large arrays should be fast!';
  53 var BIG = 10000000;
  54 var LITTLE = 10;
  55 var FAST = 50; // array truncation should be 50 ms or less to pass the test
  56 var MSG_FAST = 'Truncation took less than ' + FAST + ' ms';
  57 var MSG_SLOW = 'Truncation took ';
  58 var MSG_MS = ' ms';
  59 var status = '';
  60 var statusitems = [];
  61 var actual = '';
  62 var actualvalues = [];
  63 var expect= '';
  64 var expectedvalues = [];
  65
  66
  67
  68 status = inSection(1);
  69 var arr = Array(BIG);
  70 var start = new Date();
  71 arr.length = LITTLE;
  72 actual = elapsedTime(start);
  73 expect = FAST;
  74 addThis();
  75
  76
  77
  78 //-----------------------------------------------------------------------------
  79 test();
  80 //-----------------------------------------------------------------------------
  81
  82
  83
  84 function elapsedTime(startTime)
  85 {
  86   return new Date() - startTime;
  87 }
  88
  89
  90 function addThis()
  91 {
  92   statusitems[UBound] = status;
  93   actualvalues[UBound] = isThisFast(actual);
  94   expectedvalues[UBound] = isThisFast(expect);
  95   UBound++;
  96 }
  97
  98
  99 function isThisFast(ms)
 100 {
 101   if (ms <= FAST)
 102     return MSG_FAST;
 103   return MSG_SLOW + ms + MSG_MS;
 104 }
 105
 106
 107 function test()
 108 {
 109   enterFunc ('test');
 110   printBugNumber(BUGNUMBER);
 111   printStatus (summary);
 112
 113   for (var i=0; i<UBound; i++)
 114   {
 115     reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
 116   }
 117
 118   exitFunc ('test');
 119 }