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Benchmarking tool by jemminger
Posted: 10 Nov 05

sick of reinventing the wheel every time i wanted to performance benchmark some functions, i wrote a simple tool to do it for me... it executes your function and outputs the elapsed time in seconds that it took to run.  output is written to a textarea with id "benchmark-output", which is created dynamically if it does not exist.

one thing to keep in mind:  make sure to allow the document to load first before attempting to call benchmark(), since it will attempt to write to document.body


 * @param fn, the function to execute
 * @param args, a single argument or an array
          of arguments expected by param "fn"
 * @param optionalDisplayName, an optional name to
          show in the benchmark output
function benchmark(fn, args, optionalDisplayName) {
    var output = document.getElementById("benchmark-output");

    //  set up the output textarea
    if (!output) {
        var container = document.createElement("div");
        container.setAttribute("id", "benchmark-container");

        var title = document.createElement("div");
        title.setAttribute("id", "benchmark-title");
        title.appendChild( document.createTextNode("benchmark results") );

        output = document.createElement("textarea");
        output.setAttribute("id", "benchmark-output");
        output.style.width = "100%";
        output.style.height = "15em";



    // make sure args is an Array
    if (args && args.constructor != Array) args = [args];
    var iStart = new Date().getTime();
    fn.apply(this, args);
    var iStop = new Date().getTime();

    var name = optionalDisplayName || /(.+)\n/.exec(fn.toString())[1];
    output.value += name + " : " + ((iStop-iStart)/1000) + " sec\n";



//  no args
function foo() {
  // do something

benchmark( foo );

//  with args
function bar1(arg) {
  // do something
function bar2(arg1, arg2, arg3) {
  // do something

benchmark( bar1, "something" );
benchmark( bar2, ["something", "2", "3"] );

//  using optional display name since functions defined
//  like below don't report a name
document.foobar = function(arg) {
  // do something

benchmark( document.foobar, "blah", "foobar()" );


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