Home | History | Annotate | Download | only in Array 
      1 /*
      2 * The contents of this file are subject to the Netscape Public
      3 * License Version 1.1 (the "License"); you may not use this file
      4 * except in compliance with the License. You may obtain a copy of
      5 * the License at http://www.mozilla.org/NPL/
      6 *
      7 * Software distributed under the License is distributed on an "AS
      8 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
      9 * implied. See the License for the specific language governing
     10 * rights and limitations under the License.
     11 *
     12 * The Original Code is mozilla.org code.
     13 *
     14 * The Initial Developer of the Original Code is Netscape
     15 * Communications Corporation.  Portions created by Netscape are
     16 * Copyright (C) 1998 Netscape Communications Corporation.
     17 * All Rights Reserved.
     18 *
     19 * Contributor(s): pschwartau (at) netscape.com
     20 * Date: 27 September 2001
     21 *
     22 * SUMMARY: Performance: truncating even very large arrays should be fast!
     23 * See http://bugzilla.mozilla.org/show_bug.cgi?id=101964
     24 *
     25 * Adjust this testcase if necessary. The FAST constant defines
     26 * an upper bound in milliseconds for any truncation to take.
     27 */
     28 //-----------------------------------------------------------------------------
     29 var UBound = 0;
     30 var bug = 101964;
     31 var summary = 'Performance: truncating even very large arrays should be fast!';
     32 var BIG = 10000000;
     33 var LITTLE = 10;
     34 var FAST = 50; // array truncation should be 50 ms or less to pass the test
     35 var MSG_FAST = 'Truncation took less than ' + FAST + ' ms';
     36 var MSG_SLOW = 'Truncation took ';
     37 var MSG_MS = ' ms';
     38 var status = '';
     39 var statusitems = [];
     40 var actual = '';
     41 var actualvalues = [];
     42 var expect= '';
     43 var expectedvalues = [];
     44 
     45 
     46 
     47 status = inSection(1);
     48 var arr = Array(BIG);
     49 var start = new Date();
     50 arr.length = LITTLE;
     51 actual = elapsedTime(start);
     52 expect = FAST;
     53 addThis();
     54 
     55 
     56 
     57 //-----------------------------------------------------------------------------
     58 test();
     59 //-----------------------------------------------------------------------------
     60 
     61 
     62 
     63 function elapsedTime(startTime)
     64 {
     65   return new Date() - startTime;
     66 }
     67 
     68 
     69 function addThis()
     70 {
     71   statusitems[UBound] = status;
     72   actualvalues[UBound] = isThisFast(actual);
     73   expectedvalues[UBound] = isThisFast(expect);
     74   UBound++;
     75 }
     76 
     77 
     78 function isThisFast(ms)
     79 {
     80   if (ms <= FAST)
     81     return MSG_FAST;
     82   return MSG_SLOW + ms + MSG_MS;
     83 }
     84 
     85 
     86 function test()
     87 {
     88   enterFunc ('test');
     89   printBugNumber (bug);
     90   printStatus (summary);
     91 
     92   for (var i=0; i<UBound; i++)
     93   {
     94     reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
     95   }
     96 
     97   exitFunc ('test');
     98 }
     99