Does anyone have experience with using very large heaps 12 gb or higher in Java? Does the GC make the program ununable? What GC params do you use? Which jvm sun or bea would be better suited for this? Which platform linux or windows performs better under such conditions? In the case of windows is there any performance difference to be ...
I am trying to quantify "site slowness". In the olden days you just made sure that your HTML was lightweight, images optimized and servers not overloaded. In high end sites built on top of modern content management systems there are a lot more variables: third party advertising, trackers and various other callouts, the performance of CDN...
For a load test of my application (under Linux), I'm looking for a tool that outputs data on stdout at a specific rate (like 100 bytes/s), so that I can pipe the output to netcat which sends it to my application. Some option for dd would be ideal, but I didn't find anything so far. It doesn't really matter what kind of data is printed (N...
Hi, I'm building a auto updater and I need to know what kind of upload speeds people get on a 56K modem? ...
I have put together a script which is very much like the flickr photostream feature. Two thumbnails next to each other, and when you click the next or prev links the next (or previous) two images slide in. Cool! Currently when the page loads it loads the two images. The first time nxt / prv is used then the next two images or previous t...
I know that in JavaScript, creating a for loop like this: for(int i = 0; i < arr.length; i++) is costly as it computes the array length each time. Is this behavior costly in c# for lists and arrays as well. Or at compile-time is it optimized? Also what about other languages such as Java, how is this handled? ...
I'm working on an ASP.Net application and working to add some Ajax to it to speed up certain areas. The first area that I am concentrating is the attendance area for the teachers to report attendance (and some other data) about the kids. This needs to be fast. I've created a dual-control set up where the user clicks on the icon and via ...
I'm writing a small agent in java that will play a game against other agents. I want to keep a small amount of state (probably approx. 1kb at most) around between runs of the program so that I can try to tweak the performance of the agent based upon past successes. Essentially, I will be reading a small amount of data at the beginning of...
I have to sort a number of integers, which can have values between 30.000.000 and 350.000.000. There will be between 0 and 65.535 integers, with the average count being 20.000. RAM usage is irrelevant and speed only is important. Later on i will also have to split them into groups, with the divide always being set whenever the gap betwe...
This follows on from this question where I was getting a few answers assuming I was using files for storing my HTML templates. Before recently I've always saved 'compiled' templates as html files in a directory (above the root). My templates usually have two types of variable - 'static' variables which are not replaced on every usage bu...
I have this SQL query: SELECT * FROM IMAGES WHERE IMAGENAME in ('IMG1', 'IMG2', 'IMG3', 'IMG4', 'IMG5', 'IMG6') ORDER BY CASE IMAGENAME WHEN 'IMG1' THEN 1 WHEN 'IMG2' THEN 2 WHEN 'IMG3' THEN 3 WHEN 'IMG4' THEN 4 WHEN 'IMG5' THEN 5 WHEN 'IMG6' THEN 6 ELSE 7 END I cannot guarantee that the list of IMAGENAMEs will be in alp...
Compiling a C++ file takes a very long time when compared to C#, Java. It takes significantly longer to compile a C++ file than it would to run a normal size Python script. I'm current using VC++ but it's the same with any compiler. Why is this? The two reasons I could think of were loading header files and running the preprocessor, but...
Hi, I am working with PHP and I am wondering how bad practise it is to combine lots of funtions into a class. I am aware of it's not the purpose of classes, but the reason why I would do this is to provide a namespace. How big impact does it make to initiate let's say 10 classes at the execution of a PHP script isntead of let's say 2 or...
I have a Delphi 2009 program that handles a lot of data and needs to be as fast as possible and not use too much memory. What small simple changes have you made to your Delphi code that had the biggest impact on the performance of you program by noticeably reducing execution time or memory use? Thanks everyone for all your answers. M...
Hi, I have a page generated by php which includes two drop-down lists (SELECTs) which contain a lot of items (about 2,000 each). The page is fine, but when it loads in Firefox, there's a delay during the load, and then it seems to refresh the entire page. If a user tries to click on anything before the "reload" occurs, it has no effect....
I'll say right off the bat that this question is NOT about load times; I know about YSlow, the Firebug profiler, and whatever best practices and tools googlage reveals about page component load times. I am asking what good profiling tools or libraries or add-ons there are for measuring actual execution of Javascript (specifically jQuery...
Would there be difference in speed between if (myInt == CONST_STATE1) and if (myEnum == myENUM.State1) in c#? ...
What is the best way to test the speed of a LAMP based site, without factoring in the user's connection? In other words, I have a CMS and I want to see how long it takes for PHP and MySQL to do all their work. Additionally I do not have shell access to the server, it is in a shared hosting environment. ...
How many monitors improve programming speed? Do you have any experience with programming using 1,2,3,4... monitors? Which configurations increase work speed and are worth trying out? Is it worth using 90 degrees rotated screens? ...
I have a SQL query that takes a very long time to run on MySQL (it takes several minutes). The query is run against a table that has over 100 million rows, so I'm not surprised it's slow. In theory, though, it should be possible to speed it up as I really only want to get back the rows from the large table (let's call it A) that have a r...