PerformanceTests/DOM/resources/dom-perf/accessors.js

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// Accessors - measure access get/set properties on various objects.

// Accessors are generally pretty quick.  We loop on each accessor
// many times in order to crank up the time of the microbenchmark
// so that measurements are more substantial.  Values were chosen
// to make Firefox3 performance land in the 100-300ms range.
var kBigCount = 1500000;
var kLittleCount = 300000;
var kTinyCount = 30000;
var kVeryTinyCount = 5000;

var Accessors = {};

Accessors.WindowGet = function() {
    var nLoops = kLittleCount;
    for (var loop = 0; loop < nLoops; loop++)
        window.length;
}

Accessors.WindowSet = function() {
    var nLoops = kBigCount;
    for (var loop = 0; loop < kLittleCount; loop++)
        window.name = "title";
}

Accessors.RootGet = function() {
    var nLoops = kLittleCount;
    for (var loop = 0; loop < nLoops; loop++)
        length;
}

Accessors.RootSet = function() {
    var nLoops = kLittleCount;
    for (var loop = 0; loop < nLoops; loop++)
        title = "name";
}

Accessors.DocumentGet = function() {
    var nLoops = kLittleCount;
    for (var loop = 0; loop < nLoops; loop++)
        document.nodeType;
}

Accessors.DocumentSet = function() {
    var nLoops = kVeryTinyCount;
    for (var loop = 0; loop < nLoops; loop++)
        document.title = "name";
}

Accessors.DOMObjectSetup = function() {
    var o1 = document.createElement("span");
    var o2 = document.createElement("span");
    o1.appendChild(o2);
    this.suite.benchmarkContent.appendChild(o1);
    return o1;
}

Accessors.DOMObjectGet = function(o1) {
    var nLoops = kLittleCount;
    for (var loop = 0; loop < nLoops; loop++)
        o1.nodeType;
}

Accessors.DOMObjectSet = function(o1) {
    var nLoops = kLittleCount;
    var title = "title";
    for (var loop = 0; loop < nLoops; loop++)
        o1.title = title;
}

Accessors.ObjectGet = function(o1) {
    var nLoops = kBigCount;
    for (var loop = 0; loop < nLoops; loop++)
        o1.nodeType;
}

Accessors.NodeListSetup = function() {
    var o1 = document.createElement("span");
    var o2 = document.createElement("span");
    o1.appendChild(o2);
    this.suite.benchmarkContent.appendChild(o1);
    return o1.childNodes;
}

Accessors.NodeListGet = function(o1) {
    var nLoops = kLittleCount;
    for (var loop = 0; loop < nLoops; loop++)
        o1.length;
}

Accessors.CSSSetup = function() {
    var span = document.createElement("span");
    span.appendChild(document.createTextNode("test"));
    span.style.fontWeight = "bold";
    this.suite.benchmarkContent.appendChild(span);
    return span;
}
  

Accessors.CSSGet = function(span) {
    var nLoops = kLittleCount;
    for (var loop = 0; loop < nLoops; loop++)
        span.style.fontWeight;
}

Accessors.CSSSet = function(span) {
    var nLoops = kTinyCount;
    for (var loop = 0; loop < nLoops; loop++)
        span.style.fontWeight = "bold";
}

var AccessorsTest = new BenchmarkSuite('Accessors', [
    new Benchmark("CSS Style Get", Accessors.CSSGet, Accessors.CSSSetup),
    new Benchmark("CSS Style Set", Accessors.CSSSet, Accessors.CSSSetup),
    new Benchmark("Document Get NodeType", Accessors.DocumentGet),
    new Benchmark("Document Set Title", Accessors.DocumentSet),
    new Benchmark("Nodelist Get Length", Accessors.NodeListGet, Accessors.NodeListSetup),
    new Benchmark("Span Get NodeType", Accessors.DOMObjectGet, Accessors.DOMObjectSetup),
    new Benchmark("Span Set Title", Accessors.DOMObjectSet, Accessors.DOMObjectSetup),
    new Benchmark("Root Get Length", Accessors.RootGet),
    new Benchmark("Root Set Title", Accessors.RootSet),
    new Benchmark("Window Get Length", Accessors.WindowGet),
    new Benchmark("Window Set Name", Accessors.WindowSet)
]);