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• Today’s Performance Tip: Views are for Convenience, Not Performance!

  - by Jonathan Kehayias

  I tweeted this last week on twitter and got a lot of retweets so I thought that I’d blog the story behind the tweet. Most vendor databases have views in them, and when people want to retrieve data from a database, it seems like the most common first stop they make are the vendor supplied Views.  This post is in no way a bash against the usage or creation of Views in a SQL Server Database, I have created them before to simplify code and compartmentalize commonly required queries so that there...(read more)

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• Announcing SO-Aware Test Workbench

  - by gsusx

  Yesterday was a big day for Tellago Studios . After a few months hands down working, we announced the release of the SO-Aware Test Workbench tool which brings sophisticated performance testing and test visualization capabilities to theWCF world. This work has been the result of the feedback received by many of our SO-Aware and Tellago customers in terms of how to improve the WCF testing. More importantly, with the SO-Aware Test Workbench we are trying to address what has been one of the biggest challenges...(read more)

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• Git branching and tagging best practices

  - by Code-Guru

  I am currently learning to use Git by reading Pro Git. Right now I'm learning about branching and tags. My question is when should I use a branch and when should I use a tag? For example, say I create a branch for version 1.1 of a project. When I finish and release this version, should I leave the branch to mark the release version? Or should I add a tag? If I add a tag, should I delete the version branch (assuming that it is merged into master or some other branch)?

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• Why are invariants important in Computer Science

  - by Antony Thomas

  I understand 'invariant' in its literal sense. I also recognize them when I type code. But I don't think I understand the importance of this term in the context of computer science. Whenever I read conversations\white papers about language design from famous programmers\computer scientists, the term 'invariant' keeps popping up as a jargon; and that is the part I don't understand. What is so special about it?

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• Haskell vs Erlang for web services

  - by Zachary K

  I am looking to start an experimental project using a functional language and am trying to decide beween Erlang and Haskell, and both have some points that I really like. I like Haskell's strong type system and purity. I have a feeling it will make it easier to write really reliable code. And I think that the power of haskell will make some of what I want to do much easier. On the minus side I get the feeling that some of the Frameworks for doing web stuff on Haskell such as Yesod are not as advanced as their Erlang counter parts. I rather like the Erlang approach to threads and to fault tollerence. I have a feeling that the scalability of Erlang could be a major plus. Which leeds to to my question, what has people's exerience been in implementing web application backends in both Haskell and Erlang. Are there packages for Haskell to provide some of the lightweight threads and actors that one has in Erlang?

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• Coding in large chunks ... Code verification skills

  - by Andrew

  As a follow up to my prev question: What is the best aproach for coding in a slow compilation environment To recap: I am stuck with a large software system with which a TDD ideology of "test often" does not work. And to make it even worse the features like pre-compiled headers/multi-threaded compilation/incremental linking, etc is not available to me - hence I think that the best way out would be to add the extensive logging into the system and to start "coding in large chunks", which I understand as code for a two-three hours first (as opposed to 15-20 mins in TDD) - thoroughly eyeball the code for a 15 minutes and only after all that do the compilation and run the tests. As I have been doing TDD for a quite a while, my code eyeballing / code verification skills got rusty (you don't really need this that much if you can quickly verify what you've done in 5 seconds by running a test or two) - so I am after a recommendations on how to learn these source code verification/error spotting skills again. I know I was able to do that easily some 5-10 years ago when I din't have much support from the compiler/unit testing tools I had until recently, thus there should be a way to get back to the basics.

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• In GLSL is it possible to offset vertices based on height map colour?

  - by Rob

  I am attempting to generate some terrain based upon a heightmap. I have generated a 32 x 32 grid and a corresponding height map - In my vertex shader I am trying to offset the position of the Y axis based upon the colour of the heightmap, white vertices being higher than black ones. //Vertex Shader Code #version 330 uniform mat4 modelMatrix; uniform mat4 viewMatrix; uniform mat4 projectionMatrix; uniform sampler2D heightmap; layout (location=0) in vec4 vertexPos; layout (location=1) in vec4 vertexColour; layout (location=3) in vec2 vertexTextureCoord; layout (location=4) in float offset; out vec4 fragCol; out vec4 fragPos; out vec2 fragTex; void main() { // Retreive the current pixel's colour vec4 hmColour = texture(heightmap,vertexTextureCoord); // Offset the y position by the value of current texel's colour value ? vec4 offset = vec4(vertexPos.x , vertexPos.y + hmColour.r, vertexPos.z , 1.0); // Final Position gl_Position = projectionMatrix * viewMatrix * modelMatrix * offset; // Data sent to Fragment Shader. fragCol = vertexColour; fragPos = vertexPos; fragTex = vertexTextureCoord; } However the code I have produced only creates a grid with none of the y vertices higher than any others. This is the C++ code that generates the grid and texture co-orientates which I believe to be correct as the texture is mapped to the grid, hence the white blob in the middle. The grid-lines are generated in the fragment shader, sorry for any confusion. I have tried multiplying the r value of hmColour by 1000 unfortunately that had no effect. The only other problem it could be is that the texture coordinate data is incorrect ? for (int z = 0; z < MAP_Z ; z++) { for(int x = 0; x < MAP_X ; x++) { //Generate Vertex Buffer vertexData[iVertex++] = float (x) * MAP_X; vertexData[iVertex++] = 0; vertexData[iVertex++] = -(float) (z) * MAP_Z; //Colour Buffer NOT NEEDED colourData[iColour++] = 255.0f; // R colourData[iColour++] = 1.0f; // G colourData[iColour++] = 0.0f; // B //Texture Buffer textureData[iTexture++] = (float ) x * (1.0f / MAP_X); textureData[iTexture++] = (float ) z * (1.0f / MAP_Z); } } The heightmap texture I am trying to use appears like so (without grid-lines). This is the corresponding fragment shader // Fragment Shader Code #version 330 uniform sampler2D hmTexture; layout (location=0) out vec4 fragColour; in vec2 fragTex; in vec4 pos; void main(void) { vec2 line = fragTex * 32; // Without Gridlines fragColour = texture(hmTexture,fragTex); // With grid lines // + mix(vec4(0.0, 0.0, 1.0, 0.0), vec4(1.0, 1.0, 1.0, 1.0), // smoothstep(0.05,fract(line.y), 0.99) * smoothstep(0.05,fract(line.x),0.99)); }

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• Selecting the (right?) technology and environment

  - by Tor

  We are two developers on the edge of starting new web product development. We are both fans of lean start-up approach and would like to practice continuous deployment. Here comes the dilemma - we are both coming from a C# / Windows background and we need to decide between: Stick to .NET and Windows, we will not waste time on learning new technologies and put all our effort in the development. Switch to Ruby on Rails and Linux which has a good reputation of fast ramp up and vast open source support. The negative side is that we will need to put a lot of effort in learning Ruby, Rails and Linux... What would you do? What other considerations should we take?

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• How to evaluate the quality of Rails code?

  - by Fortuity

  In a code review, what do you look for to assess a developer's expertise? Given an opportunity to look at a developer's work on a real-world project, what tell-tale signs are a tip-off to carelessness or lack of experience? Conversely, where do you look in the code to find evidence of a developer's skill or knowledge of best practices? For example, if I'm looking at a typical Rails app, I would be happy to see the developer is using RSpec (showing a commitment to using test-driven development and knowledge that RSpec is currently more popular than the default TestUnit). But in examining the specs for a Rails model, I see that the developer is testing associations, which might indicate a lack of real understanding of Rails testing requirements (since such tests are redundant given that they only test what's already implemented and tested in ActiveRecord). More generally, I might look to see if developers are writing their own implementations versus using widely available gems or if they are cleaning up code versus leaving lots of commented-out "leftovers." What helps you determine the skill of a Rails developer? What's your code quality checklist?

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• WikiPlex v1.3 Released

  - by mhawley

  [In addition to blogging, I am also using Twitter. Follow me: @matthawley] It's been a many months since the last release of WikiPlex, but its only because there hasn't been a lot of churn recently.  I've very happy where WikiPlex is at, and it continues to be a very… (read more)

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• Code Reuse and Abstraction in FP vs OOP

  - by Electric Coffee

  I've been told that code reuse and abstraction in OOP is far more difficult to do than it is in FP, and that all the claims that have been made about Object Orientedness (for lack of a better term) being great at reusing code have been flat out lies So I was wondering if anyone here could tell me why that is, and perhaps show me some code to back up these claims, I'm not saying I don't believe you Functional programmers, it's just that I've been "indoctrinated" to think Object Orientedly, and thus can't (yet) think Functionally enough to see it myself To quote Jimmy Hoffa (from an answer to one of my previous questions): The cake is a lie, code reuse in OO is far more difficult than in FP. For all that OO has claimed code reuse over the years, I have seen it follow through a minimum of times. (feel free to just say I must be doing it wrong, I'm comfortable with how well I write OO code having had to design and maintain OO systems for years, I know the quality of my own results) That quote is the basis of my question, I want to see if there's anything to the claim or not

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• COLUMNS_UPDATED() for audit triggers

  - by Piotr Rodak

  In SQL Server 2005, triggers are pretty much the only option if you want to audit changes to a table. There are many ways you can decide to store the change information. You may decide to store every changed row as a whole, either in a history table or as xml in audit table. The former case requires having a history table with exactly same schema as the audited table, the latter makes data retrieval and management of the table a bit tricky. Both approaches also suffer from the tendency to consume...(read more)

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• Purely technical reasons for PHP as a first choice?

  - by JoelFan

  I know this may come off as a flame-y / troll-y, but I hope you will take my word for it that it's not my intention. I am just trying to understand the PHP phenomenon. After looking at the many technical issues with the language design of PHP, I am hard pressed to find any redeeming technical advantages where PHP surpasses all other languages. Before coming to the conclusion that there would simply be no reason to choose PHP as a development language on purely technical grounds, I would like to ask, if all non-technical factors were equal (such as what language the developers already know, what languages the hosting provider offers, language of existing code, cost, license, corporate fiat, etc.), would there be any type of new software system that would indicate making PHP a first choice for development? If so, what technical advantage does PHP have over all other languages that would cause you to choose it? EDIT: I am not interested in comparing PHP "out of the box" with other languages "out of the box". If PHP has a certain feature "out of the box" that another language has only after installing some readily available add-on, that is not considered an advantage for PHP for the purposes of this question.

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• How could RDBMSes be considered a fad?

  - by StuperUser

  Completing my Computing A-level in 2003 and getting a degree in Computing in 2007, and learning my trade in a company with a lot of SQL usage, I was brought up on the idea of Relational Databases being used for storage. So, despite being relatively new to development, I was taken-aback to read a comment (on Is LinqPad site quote "Tired of querying in antiquated SQL?" accurate? ) that said: [Some devs] despise [SQL] and think that it and RDBMS are a fad Obviously, a competent dev will use the right tool for the right job and won't create a relational database when e.g. flat file or another solution for storage is appropriate, but RDBMs are useful in a massive number of circumstances, so how could they be considered a fad?

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• Transposition - the success story of VB6 migration

  - by Visual WebGui

  Since all of you VB developers in the present or past would probably find it hard to believe that the old VB code can be migrated and modernized into the latest .NET based HTML5 without having to rewrite the application I am feeling I need to write another post on our migration solution. Hopefully, after reading this and the previous post you will be able to understand the different approach of our solution which already helps organizations around the world move away from the constraints of VB6 and...(read more)

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• Beat detection, weird detection

  - by Quincy

  I made this soundanalyzer class to detect beats in songs : // put it on pastebin for the big size, will put it here if people rather want that. pastebin.com/8PdgZPP3 but for some reason its only detecting beats from 637 sec to around 641(sec) and I have no idea why. I know the beats are being inserted from multiple bands since I am finding duplicates and it seems as its assigning a beat to each instant energy value in between those values. Its modeled after this : http://www.flipcode.com/misc/BeatDetectionAlgorithms.pdf So why won't the beats properly register ?

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• Is Oberon really "a better Pascal"?

  - by Maksee

  Reading Niklaus Wirth, one can notice that despite some popularity of Pascal, he is not glad that Oberon (as a "polished" successor of Pascal and Modula) didn't get much popularity. I never did anything in Oberon, but reading the page Oberon For Pascal Developers I really did not like many of the changes as a Delphi/pascal developer, for example forcing the reserved words to be always uppercase making the language case-sensitive getting rid of enumeration types What do you think about Oberon, is it really "a better Pascal" from your point of view?

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• optimizing graphics for iOS flash game

  - by 1GR3

  Friend of mine and me are working on a flash developed iOS (and later Android) puzzle board game. He's a programmer and I'm a designer/developer so (no surprise) we have a different points of view. anyway, he's method: make small tiles (100x100px) in photoshop join them into the board and then in flash apply effects to the board to avoid repetition (80's not in the good way) my method: precompose the whole board (960x640px+bleed) in photoshop and than mask active and inactive areas in flash what do you think? thank you in advance!

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• What are the major challenges in creating a platform such as StackOverflow?

  - by gablin

  Let us assume you were to create a platform such as StackOverflow. It needs to be functional, fast and scalable, just like SO, in order to be successful. What are the major challenges you would face in such a task? I'm looking for technical challenges rather than problems such as how to advertise it and stuff like that. (I'm not looking for ways of creating a new site to challenge SO; I'm just interested in how difficult it would be to create it if it didn't already exist.)

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• Selling your services when you use uncommon technologies

  - by speeder

  I took a look in Stackoverflow most popular profiles, and then I did the same in several other sites, and then I took a look in job postings in several boards, mostly out of curiosity, because I noticed this: If you work with Java, .NET or other managed languages, or you work with stuff that is popular for web development (Ruby, JavaScript, etc...) you can get lots of points on Stackoverflow, find lots of jobs and clients, find forums, friends, colleagues, etc... But how a programmer of uncommon languages (Lua, pure C, Lisp, D, ADA, Haskell, etc...) find information, sell his services, and so on? EDIT: This also applies to fields: You work with web, corporate software, database, etc... it is great... You dislike those previous 3, noone ever will hire your services...

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• What determines when an application requires mvvm?

  - by loyalpenguin

  I'm developing mobile applications for Windows Phone 7. This application calls some web services and occasionally sends responses out via web services. I recently started looking into MVVM and noticed that, although it is suggested when developing applications in WP7, alot of developers say only to use it if its necessary. Along with that they said that if the application is "small" enough or "simple" enough then it probably isn't worth the time. Hence my question. When should we use MVVM? Is it possible to build larger scale applications without it?

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• Suggestions for implementing a dynamic 2D level

  - by Wouter

  I am working on a game that needs a level that is completely generated. Currently my approach is to draw textures for the levels pixel by pixel during the game (in XNA with SpriteBatch). This is too intensive unfortunately. The game has frame drops even when I only draw 1 level texture each draw cycle. Here is an example of the current prototype. It is a simple sidescroller with the avatar swimming through a cave. The shape of this cave will alter throughout the level (textures and physics collision shapes). You can clearly see the boundaries of the level tiles in the screenshot below. These are generated just before they move into camera view. For inspiration I looked at PixelJunk Shooter 2. These levels are obviously not generated, but some of the levels have movement. How do you guys think they implemented it? My guess is that the level and other objects in the game are actually flat 3d models, but I am not sure..

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• Networking gampeplay - Sending controller inputs vs. sending game actions

  - by liortal

  I'm reading about techniques for implementing game networking. Some of the resources i've read state that it is a common practice (at least for some games) to send the actual controller input across the network, to be fed into the remote game's loop for processing. This seems a bit odd to me and i'd like to know what are the benefits of using such a method? To me, it seems that controller input is merely a way to gather data to be fed into the game, which in turn determines how to translate these into specific game actions. Why would i want to send the control data and not the game actions themselves?

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• Logging library for (c++) games

  - by Klaim

  I know a lot of logging libraries but didn't test a lot of them. (GoogleLog, Pantheios, the coming boost::log library...) In games, especially in remote multiplayer and multithreaded games, logging is vital to debugging, even if you remove all logs in the end. Let's say I'm making a PC game (not console) that needs logs (multiplayer and multithreaded and/or multiprocess) and I have good reasons for looking for a library for logging (like, I don't have time or I'm not confident in my ability to write one correctly for my case). Assuming that I need : performance ease of use (allow streaming or formating or something like that) reliable (don't leak or crash!) cross-platform (at least Windows, MacOSX, Linux/Ubuntu) Wich logging library would you recommand? Currently, I think that boost::log is the most flexible one (you can even log to remotely!), but have not good performance update: is for high performance, but isn't released yet. Pantheios is often cited but I don't have comparison points on performance and usage. I've used my own lib for a long time but I know it don't manage multithreading so it's a big problem, even if it's fast enough. Google Log seems interesting, I just need to test it but if you already have compared those libs and more, your advice might be of good use. Games are often performance demanding while complex to debug so it would be good to know logging libraries that, in our specific case, have clear advantages.

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• Is there a language where collections can be used as objects without altering the behavior?

  - by Dokkat

  Is there a language where collections can be used as objects without altering the behavior? As an example, first, imagine those functions work: function capitalize(str) //suppose this *modifies* a string object capitalizing it function greet(person): print("Hello, " + person) capitalize("pedro") >> "Pedro" greet("Pedro") >> "Hello, Pedro" Now, suppose we define a standard collection with some strings: people = ["ed","steve","john"] Then, this will call toUpper() on each object on that list people.toUpper() >> ["Ed","Steve","John"] And this will call greet once for EACH people on the list, instead of sending the list as argument greet(people) >> "Hello, Ed" >> "Hello, Steve" >> "Hello, John"

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