Running a simple microbenchmark on both 32-bit and 64-bit versions of JScript 5.8 and 9.0, on 64-bit Windodws 7

chakra.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{16d51579-a30b-4c8b-a276-0ff4dc41e755}\ProgID]
@="Chakra"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{16d51579-a30b-4c8b-a276-0ff4dc41e755}\ProgID]
@="Chakra"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Chakra]
@="JScript Language"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Chakra\CLSID]
@="{16d51579-a30b-4c8b-a276-0ff4dc41e755}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Chakra\OLEScript]

chakra.test.js

WScript.Echo( ScriptEngine() + ": " +
              ScriptEngineMajorVersion() + "." +
              ScriptEngineMinorVersion() + "." +
              ScriptEngineBuildVersion());

function foo(o) {
  var total = 0;
  for (var i = 0; i < 10000000; i++) {
    total += o.x + o.y + o.z;
  }
  return total;
}

function Point(x, y, z) {
  this.x = x;
  this.y = y;
  this.z = z;
}

function main() {
  var counter = 0;
  for (var i = 0; i < 20; i++) {
    var start = new Date();
    var p1 = new Point(2, 5, 11);
    var result = foo(p1);
    var end = new Date();
    WScript.Echo(++counter + ": " + (end - start) + "ms " + result);
  }
}

main();

command_prompt_win7_x64

D:\temp>C:\Windows\syswow64\cscript.exe chakra.test.js
Microsoft (R) Windows Script Host Version 5.8
Copyright (C) Microsoft Corporation 1996-2001. All rights reserved.

JScript: 5.8.16982
1: 10199ms 180000000
2: 10611ms 180000000
3: 10114ms 180000000
4: 9755ms 180000000
5: 11703ms 180000000
6: 9557ms 180000000
7: 7642ms 180000000
8: 9747ms 180000000
9: 10334ms 180000000
10: 10781ms 180000000
11: 11461ms 180000000
12: 9871ms 180000000
13: 8310ms 180000000
14: 10261ms 180000000
15: 12346ms 180000000
16: 9628ms 180000000
17: 8889ms 180000000
18: 10191ms 180000000
19: 11459ms 180000000
20: 10351ms 180000000

D:\temp>C:\Windows\syswow64\cscript.exe chakra.test.js //e:chakra
Microsoft (R) Windows Script Host Version 5.8
Copyright (C) Microsoft Corporation 1996-2001. All rights reserved.

JScript: 9.0.16476
1: 240ms 180000000
2: 219ms 180000000
3: 227ms 180000000
4: 220ms 180000000
5: 221ms 180000000
6: 212ms 180000000
7: 188ms 180000000
8: 192ms 180000000
9: 177ms 180000000
10: 166ms 180000000
11: 165ms 180000000
12: 171ms 180000000
13: 182ms 180000000
14: 177ms 180000000
15: 174ms 180000000
16: 168ms 180000000
17: 173ms 180000000
18: 173ms 180000000
19: 171ms 180000000
20: 163ms 180000000

D:\temp>C:\Windows\system32\cscript.exe chakra.test.js //e:chakra
Microsoft (R) Windows Script Host Version 5.8
Copyright (C) Microsoft Corporation 1996-2001. All rights reserved.

JScript: 9.0.16476
1: 2903ms 180000000
2: 3118ms 180000000
3: 3197ms 180000000
4: 3177ms 180000000
5: 3302ms 180000000
6: 3068ms 180000000
7: 3158ms 180000000
8: 2992ms 180000000
9: 3273ms 180000000
10: 2802ms 180000000
11: 3034ms 180000000
12: 3095ms 180000000
13: 3220ms 180000000
14: 3421ms 180000000
15: 3140ms 180000000
16: 1935ms 180000000
17: 1827ms 180000000
18: 1820ms 180000000
19: 1795ms 180000000
20: 1813ms 180000000

D:\temp>C:\Windows\system32\cscript.exe chakra.test.js
Microsoft (R) Windows Script Host Version 5.8
Copyright (C) Microsoft Corporation 1996-2001. All rights reserved.

JScript: 5.8.16982
1: 12578ms 180000000
2: 12522ms 180000000
3: 10882ms 180000000
4: 13250ms 180000000
5: 14357ms 180000000
6: 13195ms 180000000
7: 13375ms 180000000
8: 10614ms 180000000
9: 9995ms 180000000
10: 13970ms 180000000
11: 11409ms 180000000
12: 13094ms 180000000
13: 13412ms 180000000
14: 13695ms 180000000
15: 12852ms 180000000
16: 14316ms 180000000
17: 11592ms 180000000
18: 8523ms 180000000
19: 8072ms 180000000
20: 7922ms 180000000

D:\temp>