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• IPC linux huge transaction

  - by poly

  I'm building and application that requires huge transactions/sec of data and I need to use IPC to for the mutithreaded mutliprocceses communication, I know that there are a lot of methods to be used but not sure which one to choose for this application. This is what the application is gonna have, 4 processes, each process has 4 threads, the data chunk that needs to be transferred between two or more threads is around 400KB. I found that fifo is good choice except that it's 64K which is not that big so i'll need to modify and recompile the kernel but not sure if this is the right thing to do? Anyway, I'm open to any suggestions and I'd like to squeeze your experience in this :) and I appreciate it in advance.

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• Tips to Choose the Ideal Domain Name

  The first step of any website creation is purchasing a domain name. Choosing a domain name is not as easy as choosing a theme for your website design. This is because an ideal domain name that is well recognized by search engine will gain more traffic to your website. More traffic means more sales. Then how to make your domain generate more organic traffic to your website? Coming up with a good domain name requires a combination of knowledge, strategy, imagination.

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• Avoiding "double" subscriptions

  - by john smith

  I am working on a website that requires a bit of marketing; let me explain. This website is offering a single, say, iTunes 50$ voucher to a lucky winner. To be entered in the draw, you need to invite (and has to join) at least one friend to the website. Pretty straightforward. Now, of course it would be easy for anyone to just create a fake account and invite that account so, I was thinking of some other way to somehow find out of possible cheating. I was thinking of an IP check on the newly subscribed (invited) user, and if there is the same IP logged in the last 24 hours, and if that's the case, investigate more about it. But I was thinking that maybe there is a more clever way around this issue. Has anyone ever though about this? What other solutions did you try? Thanks in advance.

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• Inexpensive Business Checks

  - by Randy Walker

  One of the most annoying things when setting up a business is paying the outrageous fees for business checks.  When starting out, rather than pay the $150 for the handful of computer printable checks, I had bought software that would create the checks for me.  But if you didn’t know, those little digits at the bottom of a check are magnetically encoded and requires special ink. Fortunately, my current bank has one of the best bill pay websites, so I have exclusively used it.  But since I recently had to open a new bank account, I went off in search of a cheap alternative for business checks.  A bit wary of some of the printers, I opted for TechChecks and was extremely surprised a few days later when my checks arrived in perfect condition.  (I recommend the diamond prismatic red-blue-green checks.  Beautiful and very professional looking.) It was perfect timing as well, since I now have to reorder some checks for another account.

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• TGA loader: reverse height

  - by aVoX

  I wrote a TGA image loader in Java which is working perfectly for files created with GIMP as long as they are saved with the option "origin" set to "Top Left" (Note: Actually TGA files are meant to be stored upside down - "Bottom Left" in GIMP). My problem is that I want my image loader to be capable of reading all different kinds of TGAs, so my question is, how do I flip the image upside down? Note that I store all image data inside a one-dimensional byte array, because OpenGL (glTexImage2D to be specific) requires it that way. Thanks in advance.

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• Should all, none, or some overridden methods call Super?

  - by JoJo

  When designing a class, how do you decide when all overridden methods should call super or when none of the overridden methods should call super? Also, is it considered bad practice if your code logic requires a mixture of supered and non-supered methods like the Javascript example below? ChildClass = new Class.create(ParentClass, { /** * @Override */ initialize: function($super) { $super(); this.foo = 99; }, /** * @Override */ methodOne: function($super) { $super(); this.foo++; }, /** * @Override */ methodTwo: function($super) { this.foo--; } }); After delving into the iPhone and Android SDKs, I noticed that super must be called on every overridden method, or else the program will crash because something wouldn't get initialized. When deriving from a template/delegate, none of the methods are supered (obviously). So what exactly are these "je ne sais quoi" qualities that determine whether a all, none, or some overriden methods should call super?

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• Switching between Discrete and Integrated GPUs

  - by void-pointer

  Hello everyone, I develop CUDA applications on my Alienware M17x portable back-breaker, which has two discrete GTX 285M GPUs and one integrated GeForce 9400M GPU. I can currently switch between them using NVIDIA's software, but I would like the ability to do so within my applications for purposes of benchmarking and general convenience. Apparently this requires the "NDA version" of NVIDIA's Driver API, which I know not how to obtain. Would using this API be the only way to accomplish what I seek, and if so, how would I obtain it? A solution using Windows APIs would also be acceptable, though less preferable to one which would leverage a cross-platform API. I have created a similar thread concerning the matter on NVIDIA's forum, which is down at the time of this writing. Thanks for reading my question; it is much appreciated!

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• Where does the light come from, using Maya/Panda3D?

  - by Aerovistae

  Total noob to Maya. Total noob to Panda3D. Planning on becoming really good at both as soon as I have free time to do so, but right now I have an assignment due in a few hours which requires this: (The part which confuses me is bolded.) Model and texture a vehicle and two different obstacles Build a scene graph in Panda with a plane, the vehicle, several copies of each of the obstacles, and (at least) a direction light Program vehicle movement, constrained to a plane (no terrain) Working headlights Vehicle collides with obstacles How do I attach a light source to a model? I'm assuming this is done in Panda3D but I'm sufficiently new to this that I wouldn't be astonished to hear it's part of the model.

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• When should code favour optimization over readability and ease-of-use?

  - by jmlane

  I am in the process of designing a small library, where one of my design goals is that the API should be as close to the domain language as possible. While working on the design, I've noticed that there are some cases in the code where a more intuitive, readable attribute/method call requires some functionally unnecessary encapsulation. Since the final product will not necessarily require high performance, I am unconcerned about making the decision to favour ease-of-use in my current project over the most efficient implementation of the code in question. I know not to assume readability and ease-of-use are paramount in all expected use-cases, such as when performance is required. I would like to know if there are more general reasons that argue for a design preferring more efficient implementations—even if only marginally so?

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• How can a programmer refine their skills in non-visual ways?

  - by Martin Josefsson

  I feel like when I am not writing, I am reading. When I come home from my programming job I write and read software and about software. The problem is though, both reading and writing requires my eyes to be focused. That doesn't work when I'm biking, cooking shopping for groceries. Sometime I use text-to-speech programs to listen to blogs, but I feel like there could be more. What ways can a software developer learn more without requiring eye focus? How to blind coders learn the craft?

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• How can i fit 2 commands in 1 terminal shortcut

  - by Nicky Bailuc

  10 latest updates and drivers and I need to run a game called unreal tournament, but in terminal it requires 2 commands The first one is to mount into the folder: cd /usr/local/games/ut2004/ and then the second one is to open the actual game: sudo aoss ./ut2004 In one shortcut i can only fit 1 command but both don't fit in is there any way i can turn these 2 commands into one? Perhaps turni9ng on the desktop shortcut already mounted into the folder? Any help would be really appreciated because im getting kinda sick of using the terminal to run it every time.

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• Test Doubles : Do they go in "source packages" or "test packages"?

  - by sbrattla

  I've got a couple of data access objects (DefaultPersonServices.class, DefaultAddressServices.class) which is responsible for various CRUD operations in a database. A few different classes use these services, but as the services requires that a connection is established with a database I can't really use them in unit tests as they take too long. Thus, I'd like to create a test doubles for them and simply do FakePersonServices.class and FakeAddressService.class implementations which I can use throughout testing. Now, this is all good (I assume)...but my question relates to where I put the test doubles. Should I keep them along with the default implementations (aka "real" implementations) or should I keep them in a corresponding test package. The default implementations are found in Source Packages : com.company.data.services. Should I keep the test doubles here too, or should the test doubles rather be in Test Packages : com.company.data.services?

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• I don't have the password to update Ubuntu

  - by Steve

  I have bought a laptop with Ubuntu 12.04, which runs fine but wants to update. I don't have the password and it won't let me update anything. I have downloaded 12.04 in order to re-install it and it tells me it isn't suitable for my processor. The machine is a Dell latitude D505. I tried downloading the i386 version and on booting with the disc, I get: This kernel requires features not present on CPU. pae. Unable to boot. All I'm trying to do is to let software updater do it's stuff but as it asks for a password, I can't proceed. I've tried changing password in root shell but that doesn't work. Any ideas? Nothing seems to be working with this problem, so maybe I'll just wait for the next official release and try again.

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• Why Java as a First Language?

  - by dsimcha

  Why is Java so popular as a first language to teach beginners? To me it seems like a terrible choice: It's statically typed. Static typing isn't useful unless you care a lot about either performance or scaling to large projects. It requires tons of boilerplate to get the simplest code up and running. Try explaining "Hello, world" to someone who's never programmed before. It only handles the middle levels of abstraction well and is single-paradigm, thus leaving out a lot of important concepts. You can't program at a very low level (pointers, manual memory management) or a very high level, (metaprogramming, macros) in it. In general, Java's biggest strength (i.e. the reason people use it despite the shortcomings of the language per se) is its libraries and tool support, which is probably the least important attribute for a beginner language. In fact, while useful in the real world these may negatives from a pedagogical perspective as they can discourage learning to write code from scratch.

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• Cannot authenticate without a password

  - by user70267

  This question has been asked hundreds of times before, but I did not see any relevant answer so I will repost. Sorry if there is any helpful answer, please don't vote down but please link to the question(s) with such answers. The problem can be reproduced as follows: When I remove the password of an administrator account, "Log In without Password", I cannot use that account to authenticate. When I do something that requires authentication, I cannot use an admin without a password to authenticate. If I leave the password box blank without a password while choosing a non-password admin, authentication fails (in terminal or in GUI). How to fix this problem?

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• Looking for the better way to combine deep architecture refactoring with feature based development

  - by voroninp

  Problem statement: Given: TFS as Source Control Heavy desktop client application with tons of legacy code with bad or almost absent architecture design. Clients constantly requiring new features with sound quality, fast delivery and constantly complaining on user unfriendly UI. Problem: Application undoubtedly requires deep refactoring. This process inevitably makes application unstable and dedicated stabilization phase is needed. We've tried: Refactoring in master with periodical merges from master (MB) to feature branch (FB). (my mistake) Result: Many unstable branches. What we are advised: Create additional branch for refactoring (RB) periodically synchronizing it with MB via merge from MB to RB. After RB is stabilized we substitute master with RB and create new branch for further refactoring. This is the plan. But here I expect the real hell of merging MB to RB after merging any FB to MB. The main advantage: Stable master most of the time. Are there any better alternatives to the procees?

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• Oracle Launches Mobile User Experiences Design Patterns

  - by asantaga

  Mobile design requires a different way of thinking. Use Oracle’s mobile design patterns to design iPhone, Android, or browser-based smartphone applications.  We are sharing our mobile design patterns and their baked-in, scientifically proven usability to enable Oracle customers and partners to build mobile apps quickly. Our design patterns are common solutions that developers can easily apply across all application suite products. Crafted by our insight into Oracle Fusion Middleware, the patterns are designed to work with the mobile technology provided by the Oracle Application Development Framework.  Normal 0 false false false false EN-US JA X-NONE

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• clone() only partially doable; how to react?

  - by hllnll

  Suppose we have a class-hierarchy whose base class B requires a clone() method to be defined in its derivations. Whilst this works perfectly for most of them there is this one derivation X that holds an optional reference to a resource/object that can only be referenced from one instance of X. Whilst the rest of X can be cloned without problems this reference would have to be set to null/nil/nullptr. What is the correct way to handle this situation? X::clone() could throw an UncloneableException. Though this would be correct, it is not satisfying. Set the reference to null/nil/nullptr and leave no notice of it. The user of X has to know about Xs "particularities". Require derivations of B to define B::nearestClone(): the user of B has to be aware that the return value might not be a 1:1 clone. Something else?

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• Learning C++ but wanting to develop iOS Apps

  - by DiscreteGenius

  I'm a computer engineering student and taking my second programming class. I'm learning C++ using "C++ Primer Plus" 5th edition by Prata. I want to develop for iOS. I understand the main language for Xcode is Objective-C. Am I hurting myself by learning C++ before any other language (notably before my desired lang Objective-C)? There's got to be a reason the university requires C++ to learn as a basis language. Please offer any helpful guidance or how I should go about this. Thanks//

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• HTTP(S) based file server

  - by Michael

  I've got a server running Ubuntu 10.04. I've already gotten openssh for ssh and sftp on it. I've been looking for a web-based (http, or preferably https) file server, perhaps a web-front-end to an (S)FTP server, that allows access to a specific folder, and also allows uploads. It requires user authentication, preferably using PAM. This web-based solution is for users that are not allowed to use FTP software / browser extension and don't have flash / java browser plugins within their corporate environments. So far I have looked into: Webmin: Includes a file manager, however it uses Java, and I'm looking for a plugin-free implementation. Apache2: I was able to set up https and PAM authentication, but the barebone implementation doesn't include file upload (as far as I'm aware of). HFS: Haven't tried it out because it is for Windows/wine only, and I don't want to run it under wine.

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• How is Basic Physics applied in CS/SE?

  - by Wulf

  What basic physics principles do software engineers and/or computer scientists use to help solve specific or common problems? The first one that came to my head was creating a Physics engine for a game; physics is involved, as it requires knowledge of: Forces and Motion: Kinematics, Dynamics, Circular Motion However, I need another example, but haven't come across one that involves basic physics. Please consider the following basic physics (grade 12 level) concepts: Energy and Momentum: Work and Energy, Momentum and Collisions, Gravitational and Celestial Mechanics Electric, Gravitational & Magnetic Field: Electric Charges and Electric Field, Magnetic Fields and Electomagnetism The Wave Nature of Light: Waves and Light, Wave Effects of Light Matter-Energy Interface: Einstein’s Special Theory of Relativity, Waves, Photons and Matter, Radioactivity and Elementary Particles I will be happy with any response; Keywords for google, names of methods like raycasting, etc.

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• The use of LGPL for Commercial use

  - by Smarty Twiti

  I am trying to make my first app for sale, I would like to ask some questions for those who have already sold their software: Have you used a Framework/Lib whose LGPL License? if yes, what are the impressions of your customers? for example, if your customers/ competitors from the market reveal technology/secrets that you used in your solution (as LGPL requires that you make a Dynamic Link (.DLL) for your libs and you clearly tell the use of a Lib/Framework ...). Full story: For my project, I used a framework LGPL/commercial (Dual License) the second one it was too expensive (about 3000 USD) which pushed me to use LGPL.. however I still concerned.. That is why I ask for advise and especially motivations... Please do not hesitate to participate... Thanks in advance.

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• Swap is not copied back into physical memory

  - by GradGuy

  I have a question regarding swap and physical memory. Often times I run a program that requires a lot of memory and as a result I can see some of the data is copied from the physical memory into swap. However, once the program is terminated, and the physical memory is freed I can still see a considerable amount of data on swap which significantly slows down the system and is annoying! What is the reason behind this and how does the OS decide which part of data should go to swap? How long is this data supposed to be there and how is it "freed"?

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• Tension between the dependency inversion principle and avoiding "new" in C++?

  - by Kazark

  I have seen a lot of advice that it is better to do Type object; than Type* object = new Type(); in C++ whenever possible. I understand the rational behind this and appreciate it. But according to my understanding, to practice dependency inversion requires pointers, e.g.: Type* object = new Implementation();. (Or am I wrong about that?) Is there an inherent tension between the DIP and avoiding new when using C++? If so, what patterns/principles/practices can be used to mitigate this tension?

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• New to iPhone Development - iOS5 Storyboard

  - by Peter

  I'm new here and pretty new to iOS development. My question is basically, should I learn the old school development methods or just learn how to do things using the latest tools (i.e. Storyboard)? I've had a go with the Storyboard feature of XCode 4.2 and it's very powerful. My only concern is that it requires iOS 5. I don't mind learning the old way of doing things but I've been having trouble finding tutorials/examples for XCode 4.2 that don't use the storyboard. An example would be the with my trouble finding a good tutorial on how to embed a Navigation Controller into a TabBarController. A lot of the material out there seems to be for older version of XCode. Using the storyboard I'm able to set this up with seconds but still haven't managed to get it working without it. So in short :) would you guys suggest I continue my project using the Storyboard or make the extra effort to do things a little more manually?

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