I have the following two programs: long startTime = System.currentTimeMillis(); for (int i = 0; i < N; i++); long endTime = System.currentTimeMillis(); System.out.println("Elapsed time: " + (endTime - startTime) + " msecs"); and long startTime = System.currentTimeMillis(); for (long i = 0; i < N; i++); long endTime = System.currentTi...
I have created two very simple heroku apps to test out the service, but it's often taking several seconds to load the page when I first visit them: Cropify - Basic Sinatra App (on github) Textile2HTML - Even more basic Sinatra App (on github) All I did was create a simple sinatra app and deploy it. I haven't done anything to mess wi...
Hi Folks, I have a serious performance problem. I have a database with (related to this problem), 2 tables. 1 Table contains strings with some global information. The second table contains the string stripped down to each individual word. So the string is like indexed in the second table, word by word. The validity of the data in the...
I am testing out Google App Engine as a free Content Delivery Network and it feels like it's taking a long time to serve up my content. I read somewhere that GAE gzips all of your content by default, that's the primary reason I'd like to give it a shot. Why does this gae page take a say a half a second to download, while your typical s...
Hi All, In regards to the order of execution of statements in SQL, is there any difference between the following performance wise? SELECT * FROM Persons WHERE UserType = 'Manager' AND LastName IN ('Hansen','Pettersen') And: SELECT * FROM Persons WHERE LastName IN ('Hansen','Pettersen') AND UserType = 'Manager' If there is any diff...
So, there have been several posts here about importing and saving data from an external data source into Core Data. Apple documents a reasonable pattern for this: "import and save on background thread, merge saved objects to main thread." All fine and good. I have a related but different problem: the user is modifying data in the UI and...
I was trying to integrate django-voting into my project following the RedditStyleVoting instruction. In my urls.py, i did something like this: url(r'^sections/(?P<object_id>\d+)/(?P<direction>up|down|clear)vote/?$', vote_on_object, dict( model=Section, template_object_name='section', template_name='s...
OK I think I get http://stackoverflow.com/questions/1991126/difference-jquery-extend-and-jquery-fn-extend in that the general extend can extend any object, and that fn.extend is for plugin functions that can be invoked straight off the jquery object with some internal jquery voodoo. So it appears one would invoke them differently. ...
This is a noob question from someone who hasn't written a parser/lexer ever before. I'm writing a tokenizer/parser for CSS in PHP (please don't repeat with 'OMG, why in PHP?'). The syntax is written down by the W3C neatly here (CSS2.1) and here (CSS3, draft). It's a list of 21 possible tokens, that all (but two) cannot be represented a...
Hi, I'm trying to develop a small application that test how many requests per second can my service support but I think I'm doing something wrong. The service is in an early development stage, but I'd like to have this test handy in order to check in time to time I'm not doing something that decrease the performance. The problem is that...
i have a form, which you can pretend is laid out like Windows Explorer: panel on the left splitter client panel +------------+#+-----------------------+ | |#| | | |#| | | |#| | | |#| | | Left |#| ...
Hi, I am working on a project, involving large amount of data from the delicious website.The data available is at files are "Date,UserId,Url,Tags" (for each bookmark). I normalized my database to a 3NF, and because of the nature of the queries that we wanted to use In combination I came down to 6 tables....The design looks fine, however,...
What is the rationale behind the advocated use of the for i in xrange(...)-style looping constructs in Python? For simple integer looping, the difference in overheads is substantial. I conducted a simple test using two pieces of code: File idiomatic.py: #!/usr/bin/env python M = 10000 N = 10000 if __name__ == "__main__": x, y = 0...
Hey guys, I managed to put my new app on an adhoc distribution but I just noticed that I only have 3GS's ... It is working quite good on the 3GS (could be a bit faster but that's fine) ... but do you think I should test it on the 3G ? I know there has been a lot of improvements between 3G and 3GS but would that infer on my uitablevie...
Hello all, I'm currently facing some performance issues, when using several custom layers as sublayers inside my view. After creating my new layer programmatically, I add it as sublayer, like: [self.view.layer addSublayer:myNewSublayer]; This works just fine. However, when doing this over and over my app starts to slow down more an...
Hi all. When I went to University, teachers used to say that in good structured application you have presentation layer, business layer and data layer. This is what I heard for more than 5 years. When I started working I discovered that this is true but sometimes is better to have more than just three layers. Two or three days ago I dis...
I have a table that contains about 49403459 records. I want to query the table on a date range. say 04/10/2010 to 04/10/2010. However, the dates are stored in the table as format 10-APR-10 10.15.06.000000 AM (time stamp). As a result when I do SELECT bunch,of,stuff,create_date FROM myTable WHERE TO_CHAR (create_date,'MM/DD/YYYY)' >= ...
One of the exercises in TC++PL asks: Write a function that either returns a value or that throws that value based on an argument. Measure the difference in run-time between the two ways. Great pity he never explaines how to measure such things. I'm not sure if I'm suppose to write simple "time start, time end" counter, or are the...
I made a nice UIView subclass which paints all its stuff in -drawRect:, because people said that's good. That view is a subview of another. This another view is beeing animated with Core Animation: It's scaled down, rotated and moved. However, I encountered this: -drawRect seems to get called trillion of times during animation, and perfo...
So I was watching a talk by Google's Marissa Mayer about speeding up Google's pages. They found that a shopping cart icon increased load time by 2%, and users then searched 2% less. They managed to replace the icon with an HTML table. Here is my attempt at drawing a shopping cart: (live example page) <html> <head> <style> ...