CODEWITHSUNDEEP
javascriptactionscript-3
1.21 gigawatts
1.21 gigawatts

Reputation: 17796

How to determine time it takes to call a function x number of times

I'm working on function that determines the time it takes to run another function so I can see how long my code takes to run.

Here is the code: 

public function profileCall(repeatCount:int, method:Function, ...args):String {
    var time:int = getTimer(); // returns time in milliseconds since app start
    var average:Number;

    for (var i:int; i < repeatCount; i++) {
        method.apply(null, args);
    }

    time = getTimer()-time;
    average = repeatCount>0? time/repeatCount:0;

    return average;
}

var result:String = profileCall(myCode, 1000);
trace("Time taken: " + result); // Time taken: .01

I thought it was working but then I noticed in one test if I run it 100 times it says 0.1. If I run it 1000 it says .01, at 10000 it says .001.

Is it getting more accurate or is there a miscalculation? I know on multiple calls the CPU will cache calls and that can decrease execution time but the numbers don't look right. Forgive me if this is a basic question, it has been a long day.

Note: The language does not matter.

Upvotes: 0

Views: 130

Answers (1)

Organis
Organis

Reputation: 7316

You're doing it right, however... AS3 is not that slow so in most cases

var aTime:int = getTimer();

// ... do something

trace(getTimer() - aTime);

will take 0 to 1 milliseconds due to low precision of this operation. In order to evaluate the performance of certain code block you might need to run it in a loop of 1 000 000 or even 10 000 000 iterations and measure the whole execution time.

Upvotes: 1

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