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  • What technologies to use for a particle system with enormous calculation demand?

    - by Amir Rezaei
    I have a particle system with X particles. Each particle tests for collision with other particles. This gives X*X = X^2 collision tests per frame. For 60f/s, this corresponds to 60*X^2 collision detection per second. What is the best technological approach for these intensive calculations? Should I use F#, C, C++ or C#, or something else? The following are constraints The code is written in C# with the latest XNA Multi-threaded may be considered No special algorithm that tests the collision with the nearest neighbors or that reduces the problem The last constraint may be strange, so let me explain. Regardless constraint 3, given a problem with enormous computational requirement what would be the best approach to solve the problem. An algorithm reduces the problem; still the same algorithm may behave different depending on technology. Consider pros and cons of CLR vs native C.

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  • Ubuntu 12.04 mdadm inactive

    - by user32274
    For a while now, my RAID 5 has ceased to work. Everytime I tried "madm --detail /dev/md127", its states all the drive and drive info, but that two of the drives have been removed. After some restarts, doing the same thing, i am getting /dev/md127 does not appear to be active. When I go into DiskUtil, I can see all 6 Hard Drives healthy and present, and i can see the Raid 5 at the bottom under Multi-disk Devices. However, the Raid says 0.0kb, and is not active. Please help and let me know how to proceed from here. I would really like to avoid rebuilding the RAID, especially because all 6 drives seem to be healthy and present. Thanks so much.

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  • NetAdvantage - jQuery, ASP .NET MVC and HTML5 UI Components released for Web Developers

    Built for speed and portability across operating systems, iPad/tablets, desktops and multi-browser support. Includes controls for ASP .NET MVC and uses the latest technologies like HTML 5 & CSS 3. This preview includes a sampling of powerful UI controls: grid, date picker, rating, editors, even a video player! All work with the popular WebKit engine that underpins many modern desktop browsers without requiring plug-ins or extensions. The grid embraces the latest Web techniques and frameworks like jQuery Client Templates and DOM virtualization. Download these essentials for jQuery and ASP .NET MVC from us today. span.fullpost {display:none;}

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  • Ne dites plus iPhone OS 4, mais iOS 4 : le nouveau système d'exploitation pour terminaux mobiles d'A

    Comme on vous l'avait annoncé précédemment, Apple avait invité certains journalistes pour leur présenter certaines nouveautés de l'iPhone OS 4.0. Voici un tout petit résumé des nouveautés introduites dans iPhone OS 4.0 : 1500 nouvelles API à disposition des développeurs 100 nouvelles fonctionnalités proposées aux utilisateurs Parmi les nouvelles fonctionnalités proposées aux utilisateurs, Apple a mis l'accent sur 7 nouvelles fonctionnalités : Le multi-tache, mais de façon limitée (on reviendra là dessus plus tard) Les dossiers : vous pouvez maintenant avoir plus de 2000 applications réparties dans les dossiers. Au lieu de 180 auparavant. iBooks disponible également sur l'iPhone. Messagerie un...

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  • Loading Unmanaged C++ in C#. Error Attempted to read or write protected memory

    - by Thatoneguy
    I have a C++ function that looks like this __declspec(dllexport) int ___stdcall RegisterPerson(char const * const szName) { std::string copyName( szName ); // Assign name to a google protocol buffer object // Psuedo code follows.. Protobuf::Person person; person->set_name(copyName); // Error Occurs here... std::cerr << person->DebugString() << std::endl; } The corresponding C# code looks like this... [DllImport(@"MyLibrary.dll", SetLastError = true)] public static unsafe extern int RegisterPerson([MarshalAs(UnmanagedType.LPTStr)]string szName) Not sure why this is not working. My C++ library is compiled as Multi Threaded DLL with MultiByte encoding. Any help would be appreciated. I saw this is a common problem online but no answers lead me to a solution for my problem.

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  • C#. Struct design. Why 16 byte is recommended size?

    - by maxima120
    I read Cwalina book (recommendations on development and design of .NET apps). He says that good designed struct has to be less than 16 bytes in size (for performance purpose). My questions is - why exactly is this? And (more important) can I have larger struct with same efficiency if I run my .NET 3.5 (soon to be .NET 4.0) 64-bit application on i7 under Win7 x64 (is this limitation CPU / OS based)? Just to stress again - I need as efficient struct as it is possible. I try to keep it in stack all the time, the application is heavily multi-threaded and runs on sub-millisecond intervals, the current size of the struct is 64 byte.

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  • Start a thread using a method pointer

    - by Michael
    Hi ! I'm trying to develop a thread abstraction (POSIX thread and thread from the Windows API), and I would very much like it to be able to start them with a method pointer, and not a function pointer. What I would like to do is an abstraction of thread being a class with a pure virtual method "runThread", which would be implanted in the future threaded class. I don't know yet about the Windows thread, but to start a POSIX thread, you need a function pointer, and not a method pointer. And I can't manage to find a way to associate a method with an instance so it could work as a function. I probably just can't find the keywords (and I've been searching a lot), I think it's pretty much what Boost::Bind() does, so it must exist. Can you help me ?

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  • Project works in eclipse but not when exported

    - by Mike
    I wrote an application that uses GraphViz to generate some graphs as .gif's according to the DOT syntax. When I run from Eclipse the images are generated fine but when I export it as a jar the images are created but there is no data in them. When I view them in Microsoft Picture Viewer its just the red X. It was working as an exported jar until I put the picture generation in its own thread. I can't seem to figure out whats going on here. Are there any problems exporting multi-threaded projects? Any one have any ideas? Thanks

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  • How does lock(syncRoot) make sense on a static method?

    - by Rising Star
    The following code is excerpted from the (Windows Identity Foundation SDK) template that MS uses to create a new Security Token Service Web Site. public static CustomSecurityTokenServiceConfiguration Current { get { HttpApplicationState httpAppState = HttpContext.Current.Application; CustomSecurityTokenServiceConfiguration customConfiguration = httpAppState.Get( CustomSecurityTokenServiceConfigurationKey ) as CustomSecurityTokenServiceConfiguration; if ( customConfiguration == null ) { lock ( syncRoot ) { customConfiguration = httpAppState.Get( CustomSecurityTokenServiceConfigurationKey ) as CustomSecurityTokenServiceConfiguration; if ( customConfiguration == null ) { customConfiguration = new CustomSecurityTokenServiceConfiguration(); httpAppState.Add( CustomSecurityTokenServiceConfigurationKey, customConfiguration ); } } } return customConfiguration; } } I'm relatively new to multi-threaded programming. I assume that the reason for the lock statement is to make this code thread-safe in the event that two web requests arrive at the web site at the same time. However, I would have thought that using lock (syncRoot) would not make sense because syncRoot refers to the current instance that this method is operating on... but this is a static method? How does this make sense?

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  • BlackBerry threading model

    - by Rory Fitzpatrick
    I've read a lot of comments mention in passing that the BlackBerry threading model deviates from the Java standard and can cause issues, but no amount of googling has enlightened me on what this means exactly. I've been developing a fairly large business application for the BlackBerry and, although I don't really have any previous experience with Java multi-threaded applications, haven't come across any issue that we've been able to blame on threading, other than what we caused ourselves. Can someone describe exactly how the BlackBerry threading model is different, and how I as a developer should take that into account? Obviously any links on the topic would also be great.

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  • Can my thread help the OS decide when to context switch it out?

    - by WilliamKF
    I am working on a threaded application on Linux in C++ which attempts to be real time, doing an action on a heartbeat, or as close to it as possible. In practice, I find the OS is swapping out my thread and causing delays of up to a tenth of a second while it is switched out, causing the heartbeat to be irregular. Is there a way my thread can hint to the OS that now is a good time to context switch it out? I could make this call right after doing a heartbeat, and thus minimize the delay due to an ill timed context switch.

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  • Download the Visual Studio 2010 Trial Today

    Visual Studio 2010 is here! Get multiple monitor support; new support for SharePoint development, including numerous templates; enhanced multi-targeting support allowing developers to target multiple versions of the .NET Framework; and experience how Visual Studio 2010 simplifies building standards-based Web applications with improved AJAX frameworks, core IntelliSense support for JavaScript, and jQuery....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Les premiers smartphones dual-core présentés au CES hier, à quoi servira une telle puissance ?

    Les premiers smartphones dual-core présentés au CES hier, à quoi servira une telle puissance ? Mise à jour du 06.01.2011 par Katleen Début décembre 2010, Nvidia affirmait que "les processeurs dual-core seront le standard en 2011" pour les smartphones et pour les tablettes. Cette prédiction semble être sur le chemin de la réalisation, comme l'ont démontré certains acteurs du secteur hier au CES. En effet, les premiers modèles de téléphones mobiles multi-coeurs y ont été présentés. Motorola a dévoilé son Atrix 4G qu'il vante comme «le smartphone le plus puissant du monde». Dans ses entrailles, on trouve un processeur dual-core Tegra 2 cadencé à 2 Ghz et 1 Go de RAM. De quoi réaliser de ...

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  • What class structure allows for a base class and mix/match of subclasses? (Similar to Users w/ roles)

    - by cdeszaq
    I have a set of base characteristics, and then a number of sub-types. Each instance must be one of the sub-types, but can be multiple sub-types at once. The sub-types of each thing can change. In general, I don't care what subtype I have, but sometimes I do care. This is much like a Users-Roles sort of relationship where a User having a particular Role gives the user additional characteristics. Sort of like duck-typing (ie. If my Foo has a Bar, I can treat it like a ThingWithABar.) Straight inheritance doesn't work, since that doesn't allow mix/match of sub-types. (ie. no multi-inheritance). Straight composition doesn't work because I can't switch that up at runtime. How can I model this?

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  • Verify SQL Server Stored Procedures are the same on multiple servers

    I have a stored procedure I push down to all of my servers that does a custom backup job and I want to make sure all servers have the same stored procedure. Is there some way to check without going to each server and reviewing the stored procedure? Check out this to find out. New! SQL Monitor 3.0 Red Gate's multi-server performance monitoring and alerting tool gets results from Day One.Simple to install and easy to use – download a free trial today.

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  • No panels at all after upgrading from 10.04 to 12.04

    - by user86330
    After upgrading to 12.4 from 10.4 on an AMD64 the situation is as follows: After booting I see the Xubuntu logo splash screen and when I log in I get an error that there is a system crash somewhere (it suggest to click on the notification icon, but no info appears then). FInally I can only see my initial 10.04 Desktop but I have no panels at all, so I can only click on my Desktop objects. Question: Will a clean re intall solve the problem? In such case will my multi partition configuration (Vista+XP+ubuntu partitions) be affected?

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  • MultiThreading question

    - by TiGer
    Hi, I am developing on Android but the question might be just as valid on any other Java platform. I have developed a multi-threaded app. Lets say I have a first class that needs to do a time-intensive task, thus this work is done in another Thread. When it's done that same Thread will return the time-intensive task result to another (3rd) class. This last class will do something and return it's result to the first-starting class. I have noticed though that the first class will be waiting the whole time, maybe because this is some kind of loop ? Also I'd like the Thread-class to stop itself, as in when it has passed it's result to the third class it should simply stop. The third class has to do it's work without being "incapsulated" in the second class (the Thread one). Anyone knows how to accomplish this ? right now the experience is that the first one seems to be waiting (hanging) till the second and the third one are done :(

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  • Windows Phone 7 : 80.000 applications depuis hier, 300 nouveautés par jour, 3.700 créations françaises et un « Appselerator »

    Windows Phone : 80.000 applications depuis hier 300 nouveautés par jour, 3.700 créations françaises et un « Appselerator » Microsoft France l'a confirmé. La galerie de Windows Phone 7 a officiellement dépassé les 80.000 applications depuis hier. Parmi ces 80.000, 3.700 ont été publiées par un des 3.000 développeurs français recensés. Côté qualitatif, le catalogue s'enrichit avec quelques « poids lourds » comme Velib' ou (bientôt) iCoyote, réalisées respectivement par Mobile Tech People et par Net Sense. Les développeurs de ces applications aux expériences multi-plateformes sont particulièrement bien placés pour comparer les différents OS. Tous semblent d'accord pour dire qu...

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  • Microsoft diffuse le premier spot TV de Windows 8, la campagne de promotion de l'OS s'annonce plus dynamique que les précédentes

    Microsoft diffuse le premier spot TV de Windows 8 La campagne de promotion de l'OS s'annonce plus dynamique que les précédentes Pour sa sortie officielle prévue le 26 octobre, Microsoft entame la campagne marketing pour Windows 8 et diffuse une première vidéo promotionnelle. Souplesse, rapidité et habilité, telle est la ligne directrice de ce spot TV qui donne le ton d'une méga-campagne qui s'annonce plus dynamique, et de loin, par rapport aux précédentes. Le spot, diffusé aux États-Unis et sur YouTube, commence par un compte positif qui stagne à 8, suivi du déroulement rapide des fonctionnalités du nouvel OS centrées sur le multi-touch avec des clichés du numéro 8 qui re...

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  • Google s'intéresse de près au bureau en 3D en rachetant une start-up canadienne : bientôt dans Chrom

    Google s'intéresse de près au bureau en 3D En rachetant une start-up canadienne : bientôt dans Chrome et Android ? BumpTop vient d'être rachetée par Google. Cette start-up canadienne a mis au point une interface 3D destinée à remplacer le bureau de Windows ou de Mac OS. Visiblement très intéressé par ce produit - et très satisfait de son état d'avancement - Google a décidé de faire l'acquisition de la société pour un montant resté confidentiel. Un des atouts de BumpTop est de supporter le multi-touch. Une fonctionnalité qui en fait un client idéal pour intégrer Android, l'OS de Google pour les smartphones (ou les terminaux tels que les télévisions), voire pou...

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  • Using Friendly Names for SQL Servers via DNS

    Wouldn't it be great if your HR folks only had to put in HR-SQL.mydomain.com for the database connection in their reports? They wouldn't have to remember it was on server Nile and they certainly wouldn't have to change their reports if you migrated their database from the Nile server to the server named Danube. In DNS there are two easy ways to do this. New! SQL Monitor 3.0 Red Gate's multi-server performance monitoring and alerting tool gets results from Day One.Simple to install and easy to use – download a free trial today.

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  • [C++] Needed: A simple C++ container (stack, linked list) that is thread-safe for writing

    - by conradlee
    I am writing a multi-threaded program using OpenMP in C++. At one point my program forks into many threads, each of which need to add "jobs" to some container that keeps track of all added jobs. Each job can just be a pointer to some object. Basically, I just need the add pointers to some container from several threads at the same time. Is there a simple solution that performs well? After some googling, I found that STL containers are not thread-safe. Some stackoverflow threads address this question, but none form a consensus on a simple solution.

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  • Kinect pourrait bientôt être compatible avec les ordinateurs tournant sous Windows, d'après un développeur de jeux coréen

    Kinect pourrait bientôt être compatible avec les ordinateurs tournant sous Windows, d'après un développeur coréen Mise à jour du 23.12.2010 par Katleen Alors que Kinect fait l'objet de nombreux détournements et est en train de devenir le joujou préféré des hackers, un développeur coréen spécialisé dans les jeux vidéos a déclaré que la technologie de Microsoft pourrait très bientôt fonctionner avec les ordinateurs équipés de Windows. Microsoft n'a pas encore officialisé la nouvelle, elle est donc à prendre avec des pincettes. Mais l'éditeur GamePrix, qui vient de sortir le RPG multi-joueurs Divine Souls sur PC, a déclaré que le jeu "supportera Kinect". Et, d'après la compagnie...

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  • Game Database Connectivity Java

    - by The Kraken
    I'm developing a simple multi-player puzzle game in Java. Both players should be able to view the same game board on his own computer. Then, when one player makes an action in the game (ex. drags an object onto a coordinate space), the game's view should update automatically on the other computer's game screen. I'd like all this to happen over the internet, not requiring both computers to be on the same LAN connection. If I need to use SQL/PHP to accomplish this, I'm unsure how to design the database to accomplish something as simple as the following: Player A drags element onscreen Game sends coordinates of element to database/server Player B's computer detects a change to an item in the database Player B's computer grabs the coordinates of Player A's item Player B's machine draws onscreen elements at the received coordinates Could somebody point me in the right direction?

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  • Le SDK de Kinect compatible avec la preview de Windows 8 et les applications 64bits, la deuxième Beta est disponible en téléchargement

    Le SDK de Kinect compatible avec la preview de Windows 8 Et les applications 64bits, sortie de la deuxième Beta Mise à jour du 14 novembre 2011 par Idelways Microsoft a mis à jour le SDK Windows de son capteur Kinect, en vue de son lancement commercial début 2012. Cette deuxième Beta gratuite est compatible avec la version Preview pour développeurs de Windows 8. La documentation de cette Beta proclame une amélioration significative des performances de suivi des silhouettes (jusqu'à 20 % plus rapide), tout en étant plus précis. Le support fraîchement introduit du multi-threading et des processeurs multicoeurs contribue à...

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