timing

So here is my timings: >>> import timeit >>> timeit.timeit(lambda: set(l)) 0.7210583936611334 >>> timeit.timeit(lambda: {*l}) 0.5386332845236943 Why is that, my opinion would be equal but it's not. So unpacking is fast from this example, right? For the same reason [] is faster than list() ; the interpreter includes dedicated support for syntax based operations that uses specialized code paths, while constructor calls involve: Loading the constructor from built-in scope (requires a pair of dict lookups, one in global scope, then another in built-in scope when it fails) Requires dispatch through

I have this code snippet that I use everywhere in my programs (C++ and OpenCV). It is for timing some operations: double t; // Some code... t = (double)getTickCount(); Object1.LotOfComputing(); t = 1000*((double)getTickCount() - t)/getTickFrequency(); cout << "Time for LotOfComputing =" << t << " milliseconds."<< endl; cout << "=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=" << endl; This is how the OpenCV doc recommend to time a function/portion of code and it seems to works for me after using it for some weeks. The times I measure are ranging from about 1ms to 700ms, and I round them to the millisecond.

I have found some code on measuring execution time here http://www.dreamincode.net/forums/index.php?showtopic=24685 However, it does not seem to work for calls to system(). I imagine this is because the execution jumps out of the current process. clock_t begin=clock(); system(something); clock_t end=clock(); cout<<"Execution time: "<<diffclock(end,begin)<<" s."<<endl; Then double diffclock(clock_t clock1,clock_t clock2) { double diffticks=clock1-clock2; double diffms=(diffticks)/(CLOCKS_PER_SEC); return diffms; } However this always returns 0 seconds... Is there another method that will work?

I think my program is skipping result of JSON call. Is it possible to make a closure function here or make the program wait for JSON call to return? function username_not_duplicate(username) { var function_name = "get_username"; var parameters = [username]; var url = "/get_functions.php?function_name=" + function_name + "&parameters=" + parameters; $.getJSON(url, function(user_name) { if (user_name == true) { return true; } }); return false; } Drew Wills The $.getJSON() API call is asynchronous. You can make it synchronous by using $.ajax() this way: function username_not_duplicate(username) {

I'm using the Firebug net panel to see response times. On the net panel's status bar, the summary is displayed as follows: 10 requests 90KB 10.22s (onload 6.57s) What does that onload time mean? Does it mean that once the content was received from the server, it took another 6.57 seconds for the page to become usable (i.e. for the onready event to finish)? Note: The site I'm testing is VERY heavy with Qooxdoo components and oodles of JavaScript. Martin Algesten You page initialization order is: head scripts body scripts onload later things So 'onload' is the time until the onload event is

Assumptions: rAF now time is calculated at the time the set of callbacks are all triggered. Therefore any blocking that happens before the first callback of that frame is called doesn't affect the rAF now and it's accurate--at least for that first callback. Any performance.now() measurements made before a rAF set is triggered should be earlier than rAF now . Test: Record before (a baseline time before anything happens). Set the next rAF. Compare rAF now and actual performance.now() to before to see how different they are. Expected results: var before = performance.now(), frames = ["with

Is it possible, using jQuery, to fire off an event to set a div tag's text after n. seconds? Thanks! George var doIt = function() { $("div.my").text("My message"); } setTimeout(doIt, 3000); if you're using jQuery 1.4, you can always do: $(function() { $('#divId').delay(3000).text('New Text'); }); I've been using the following jQuery plugins below for this. Delay can be used with chained functions, notNow can't. Delay http://plugins.jquery.com/project/delay $('#animate-this').fadeIn().delay(500).fadeOut(); notNow http://plugins.jquery.com/project/notNow $.notNow(2000, function() { alert(