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• Current state of the art for holographic displays?

  - by kamziro

  In another thread I was asking about independent arcade system development, and partly it was because I'm interested in using available 3D holographic technology for the displays. I saw one which involved a rotating mirror at very high speeds, so that's probably not going to be too feasible (I'd hate to think of what happens when something goes wrong). However, I looked around for videos from trade shows, and I found this: http://www.youtube.com/watch?v=Vl0EIngM-RA But information is scarce, and I'm led to believe it's just using mirrors and reflections, and does not convey true 3D depth like the one using rotating mirrors at high speed: http://www.youtube.com/watch?v=YKCUGQ-uo8c So yeah, does anyone know if there's something better available today?

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• ASP -response-flush-flushes-partial-data

  - by Anshu

  I am developing a web app with an ASP server side and I use an iframe for data push. An ASP handler flushes every once in a while some javascript to the iframe: context.Response.Write("<script language='javascript'>top.update('lala');</script>"); context.Response.Flush(); My problem is that sometimes, when I receive the data, I don't get the full text. For example I will receive this : update('lala'); One workaround I have is to have a thread flushing '..........' every 500ms. (Then I will receive script...... which will complete my javascript.) However I am sure there must be a way to have Response.Flush() sending the whole chunk of data. Does someone have an idea on how to use properly Response.Flush() ? Thank you!

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• Why using the word "mechanism" in CS?

  - by Nick Rosencrantz

  I'm not sure about the usage of the word "mechanism" when in fact most of the time what is meant is an algorithm. For instance there's talk about Java's "thread-scheduling mechanism" - why not call it an algorithm and why borrow a term from mechanics where relations sometimes are the opposites than of computer science? I'm aware that an algorithm is considered a "mechanical solution" but is this really the case in fact when a lot of algorithm don't have mechanical representations for instance a file-sharing network that gets quicker and faster as the usage grows, that would be the reverse of a mechanical structure that would go slower when usage grows.

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• Using Interlocked.Exchange(ref Enum, 1) to prevent re-entrancy [migrated]

  - by makerofthings7

  What options do I have for pending work that can't acquire a lock via the following sample? System.Threading.Interlocked.CompareExchange<TrustPointStatusEnum> (ref tp.TrustPointStatus, TrustPointStatusEnum.NotInitalized,TrustPointStatusEnum.Loading); Based on my research think I have the following options: I can use Threading.SpinWait (for very quick IO tasks) at the cost of CPU I can use Sleep() which has an unreliable wake up time I'm not sure of any other option, but what I want to make sure of is that all these options work with the .NET 4 async and await keywords, especially if I use Task to run them on a background thread

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• Examples of "Lost art" on software technology/development

  - by mamcx

  With the advent of a new technology, some old ideas - despite been good - are forgotten in the process. I read a lot how some "new" thing was already present in Lisp like 60 years ago, but only recently resurface with other name or on top of another language. Now look like the new old thing is build functional, non-mutable, non-locking-thread stuff... and that make me wonder what have been "lost" in the art of development of software? What ideas are almost forgotten, waiting for resurface? One of my, I remember when I code in foxpro. The idea of have a full stack to develop database apps without impedance mismatch is something I truly miss. In the current languages, I never find another environment that match how easy was develop in fox back them. What else is missing?

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• Using JDBC to asynchronously read large Oracle table

  - by Ben George

  What strategies can be used to read every row in a large Oracle table, only once, but as fast as possible with JDBC & Java ? Consider that each row has non-trivial amounts of data (30 columns, including large text in some columns). Some strategies I can think of are: Single thread and read table. (Too slow, but listed for clarity) Read the id's into ConcurrentLinkedQueue, use threads to consume queue and query by id in batches. Read id's into a JMS queue, use workers to consume queue and query by id in batches. What other strategies could be used ? For the purpose of this question assume processing of rows to be free.

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• Introduction à CRaSH, un shell pour superviser une machine virtuelle Java, application à la visualisation d'un cache, par Damien Rieu

  Bonjour, Vous trouverez un article sur CRaSH à cette adresse : http://damienrieu.developpez.com/art...hcache_spring/ CRaSH permet de se connecter à une JVM en mode Shell puis d'exécuter des commandes directement sur cette JVM. Ainsi, nous allons accéder à un certain nombre de commandes prédéfinies (exemple la commande thread, jdbc, java?). Une des grandes forces de CRaSH est que l'on peut aussi définir ses propres commandes Shell par programmation (Syntaxe Java ou Groovy). Il est alors possible de réaliser des commandes spécifiques à nos besoins ! Dans cette article, nous allons présenter CRaSH grâce à un cas pratique. Pour cela, nous allons réaliser une comman...

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• In dual boot PC, the boot/GRUB menu suddenly disappeared (Ubuntu option is not appearing anymore)

  - by iammilind

  I have been using Ubuntu 13.04 as my primary OS for quite sometime on Sony VAIO laptop with other OS being windows 8 (never use it). Till today, everything was fine. In the evening I had shut down my PC and closed the lid; Typically I do this when the shutting down screen is still on. But probably this time it was fatal. When I again restarted my PC, now no menu is appearing for selecting OS and it directly goes for Windows 8. My question is similar to this thread, but I don't have Ubuntu CD as I had installed using pen drive sometime back. Is there any (genuine or workaround) easier way to get back the GRUB menu back in the place? Note that keyboard shortcuts in Sony VAIO is different, here I have an "Assist" menu as well to get those internal options.

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• XNA Skinned Model - Keyframe.Bone out of range exception

  - by idlackage

  I'm getting an IndexOutOfRangeException on this line of AnimationPlayer.cs: boneTransforms[keyframe.Bone] = keyframe.Transform; I don't get what it's really referring to. The error happens when keyframe.Bone is 14, but I have no idea what that's supposed to mean. The 14th bone of my model? What would that even be? I read this thread, but nothing there seemed to work. I don't have many bones, stray edges/verts, unassigned verts, unparented/non-root bones, or bones with dots in the name. What else can I be missing? Thank you for any help!

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• Throttle and overheating on Dell XPS Studio 1645

  - by Ross

  I realise there is an older thread on the very subject but that seems to be pretty dead. I just got a Dell Studio XPS 1645 laptop and the fan noise and overheating is pretty ridiculous. This is actually a well known problem with the laptop that is apparently solved with the combination of a BIOS update and the purchase of their 130w charger. I plan on buying this charger as soon as possible, however I've noticed that since installing Ubuntu the fan noise has became more permanent and the overheating is quite a bit worse too. I've had to turn it off twice to let it cool down for an hour or so because it starts seriously affecting the performance. It makes watching things, listening to music or leaving the laptop on while I sleep a real pain. If anyone has some new information on this issue or could help out in anyway at all I'd be very grateful. Thanks.

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• Are programming languages perfect?

  - by mohabitar

  I'm not sure if I'm being naive, as I'm still a student, but a curious question came to my mind. In another thread here, a user stated that in order to protect against piracy of your software, you must have perfect software. So is it possible to have perfect software? This is an extremely silly hypothetical situation, but if you were to gather the most talented and gifted programmers in the world and have them spend years trying to create 'perfect' software, could they be successful? Could it be that not a single exploitable bug could be created? Or are there flaws in programming languages that can still, no matter how hard you try, cause bugs that allow your program to be hijacked? As you can tell, I know nothing about security, but essentially what I'm asking is: is the reason why software is easily exploitable the fact that imperfect human beings create it, or that imperfect programming languages are being used?

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• Multithreading for a mixed-genre game in Python?

  - by arrogantc

  So here's the situation. I'm making a game that mixes two genres; arcade shooter and puzzler. They don't intertwine TOO much; all the interaction that really goes on is that every time an enemy is destroyed, a block is created. The blocks aren't even a part of the main collision detection system; they have their own more suited to their needs. What I want to ask is this; might it be a good idea to have the arcade shooter portion run on one thread, and the puzzle game portion run on another?

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• need example sql transaction procedures for sales tracking or financial database [closed]

  - by fa1c0n3r

  hi, i am making a database for an accounting/sales type system similar to a car sales database and would like to make some transactions for the following real world actions salesman creates new product shipped onto floor (itempk, car make, year, price).   salesman changes price.   salesman creates sale entry for product sold (salespk, itemforeignkey, price sold, salesman).   salesman cancels item for removed product.   salesman cancels sale for cancelled sale    the examples i have found online are too generic...like this is a transaction... i would like something resembling what i am trying to do to understand it.  anybody have some good similar or related sql examples i can look at to design these? do people use transactions for sales databases?  or if you have done this kind of sql transaction before could you make an outline for how these could be made?  thanks  my thread so far on stack overflow... http://stackoverflow.com/q/4975484/613799

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• Python service using Upstart on Ubuntu

  - by Soumya Simanta

  I want to create to deploy a heartbeat service (a python script) as a service using Upstart. My understanding is that I've to add a /etc/init/myheartbeatservice.conf with the following contents. # my heartbeat service description "Heartbeat monitor" start on startup stop on shutdown script exec /path/to/my/python/script.py end script My script starts another service process and the monitors the processes and sends heartbeat to an outside server regularly. Are startup and shutdown the correct events ? Also my script create a new thread. I'm assuming I also need to add fork daemon to my conf file? Thanks.

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• Visit the My Oracle Support Procurement Community Today!

  - by user793553

  Get help with your issues from Oracle Procurement experts and your industry peers by posting a community thread. See upcoming webcasts, featured discussions and news and announcements. You can additionally search for answers to issues in the Community using keywords. It is simple to use and very powerful, try using the community to search for solutions before logging a Service Request. This is an already paid for Offering; if you have access to MyOracleSupport then you can use the Community. Access the Procurement community from My Oracle Support via the Community tab or directly at http://communities.oracle.com.  Take the 2 minute tour in the Community Main Home tab to get started.  Then search on Procurement in the ‘Find a Community’ field and get started!!

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• Your Feedback on Oracle Asset Tracking

  - by LuciaC-Oracle

  Oracle Asset Tracking Development strives to improve customer satisfaction with our Oracle Asset Tracking product.  In this context, they are very interested in getting your feedback about the Oracle Asset Tracking module. Recently, we have seen more and more customers using OAT and we would like to know for example: Have you have encountered any product gaps that need to be addressed? Are there business flows that do not suit your requirements? What new features you want to see in the product? Please share your feedback with us and we will discuss it with Oracle Asset Tracking Development and Product teams to improve the product. To share your feedback either post to the dedicated thread in the MOS Install Base Community here OR add a comment to this blog post (note that the blog comment you enter won't immediately be visible in the blog).

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• Unable to login following permission changes in device manager (11.10 + Gnome)

  - by Symanuk

  (Running Gnome 3 on Ubuntu 11.10) Everything working well (at least a couple of months), until recently when I changed the permissions through the device manager on the sda1 /2/ 3 drives, thinking it would save all the switching I seem to have to do between users in order to see / use files I previously copied across from an external drive. Now when I boot up the Ubuntu splash screen loads indefinitely, and if I go in through the GRUB / recover option, i'm getting a load of negative permission messages back (regardless of using the fsck or remount options) Either way = unusable machine (Laptop Dell Inspiron n5050), and no way through to login. I'm looking for: (1) a way back in so any help greatfully received (answers need to be pretty basic as i'm a novice), and (2) if i'm to learn anything, a decent thread on setting permissions within Ubuntu / Gnome 3. I'm new to both Ubuntu & Linux, so please be gentle!! Cheers

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• [JOGL] my program is too slow, ho can i profile with Eclipse?

  - by nkint

  hi juys my simple opengl program is really toooo slow and not fluid i'm rendering 30 sphere with simple illumination and simple material. the only hard(?) computing stuffs i do is a collision detection between ray-mouse and spheres (that works ok and i do it only in mouseMoved) i have no thread only animator to move spheres how can i profile my jogl project? or mayebe (most probable..) i have some opengl instruction that i don't understand and make render particular accurate (or back face rendering that i don't need or whatever i don't know exctly i'm just entered in opengl world)

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• Simplicity-efficiency tradeoff

  - by sarepta

  The CTO called to inform me of a new project and in the process told me that my code is weird. He explained that my colleagues find it difficult to understand due to the overly complex, often new concepts and technologies used, which they are not familiar with. He asked me to maintain a simple code base and to think of the others that will inherit my changes. I've put considerable time into mastering LINQ and thread-safe coding. However, others don't seem to care nor are impressed by anything other than their paycheck. Do I have to keep it simple (stupid), just because others are not familiar with best practices and efficient coding? Or should I continue to do what I find best and write code my way?

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• Calling Web Service with Complex Parameters in ADF Mobile

  - by Shay Shmeltzer

  Many of the SOAP based web services out there have parameters of specific object types - so not just simple String/int inputs. The ADF Web service data control makes it quite simple to interact with them. And this applies also in the case of ADF Mobile. Since there were several thread on OTN asking about this - I thought I'll do a quick demo to refresh people memory about how you pass these "complex" parameters to your Web service methods. By the way - this video is also relevant if you are not doing mobile development, you'll basically use the exact same process for building "regular web" ADF applications that access these types of Web services. One more thing you might want to do after you create the page is look at the binding tab to see the method call in there, and notice the parameters for it in the structure property. Go and look at their NDValue property to get the complete picture.

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• Displaying and updating score in Android (OpenGL ES 2)

  - by user16547

  I'm using a FrameLayout where I have a GLSurfaceView at the bottom and a few Views on top of it. One of those Views is a TextView that displays the current score. Here's how I'm updating the score TextView based on what happens in my game loop: whenever an event happens that increases the score, I call activity.runOnUiThread(updater), where activity is the activity that has the above FrameLayout (my main game activity) and updater is just a Runnable that increments the score. From my understanding, using runOnUiThread() from the OpenGL thread is standard practice - otherwise you'll get an exception, I can't remember its name. The problem is that there's a very noticeable lag between the event and the score update. For example the character gets a coin, but the coin count is not updated quickly. I tried summing all the score events from my game loop and calling runOnUiThread() only once per loop, but it doesn't seem to make much of a difference - the lag is still noticeable. How can I improve my design to avoid this lag?

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• Corsair Hydro i series cpu cooler fan control

  - by user214690

  Im relatively new at Ubuntu and have found an answer to basically every single issue ive ever had thru this site... Otherthan this. I have been toying with the idea of a Corsair h80i for my dual boot system (win7/U12.10) and mostly use it in ubuntu. I have done some research on the interweb regarding fan control in linux and nearly ran up short untill I came across this thread: http://ubuntuforums.org/archive/index.php/t-2096166.html And it seems to have worked around it. (altho I have not tested it for myself) Is there any program/library/source that can be used to control the fans without having to MacGuyver it??

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• Tales from the Coal Face - Speeding up a C# compilation

  - by TATWORTH

  At one place, I was faced with a C# solution which when XML documentation was turned on, the compilation time increased from 45 seconds to over 8 minutes. This slowdown was unacceptable, however some digging revealed an excellent suggestion by Eric Woodruff at http://social.msdn.microsoft.com/Forums/en-US/devdocs/thread/9bbad4cc-e229-49da-a6f7-3cdf470ac53a/ where he suggested "just suppress the warning by entering it's number (1591 for C#) in the Suppress Warnings field on the Build tab of the project properties". I followed Eric's suggestion and the compilation time went back down to 45 seconds. Now that CS1591 is suppressed how was missing documentation to be found? All that was necessary was to run StyleCop!

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• Quickly and Python Twisted

  - by Aaron

  I am creating a Quickly application that makes use of Python Twisted. When the user launches a window, I want to start the Twisted server I wrote. However, when I do this, it freezes the GUI, because the reactor.run method is constantly running after it is started. I need a way to start the Twisted reactor in its own thread, so that the GUI will continue to operate while the reactor is running. I have read about using Twisted with pyGTK in the Twisted documentation, but I am not sure how I would accomplish this with a Quickly application. What is the best way to start my Twisted server when a window opens without freezing the GUI? Update: My if __name__ == '__main__' statement at the end of my dialog file is: print 'Preparing GLib' GLib.idle_add(before_running) print 'Staring Reactor' from twisted.internet import reactor reactor.run()` I have imported and installed twisted.gtk3reactor earlier on in the file. The before_running method contains dialog = ClientDialog() and dialog.show, as well as the rest of the code I want to run when the dialog opens.

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• ASP.NET or PHP for news website? [closed]

  - by Goma

  Whcih is better to build a news website from scratch with the following features: Every registered member can read the news. some members (moderators) can add news. Admin can edit, delete,etc. Every thread or topic may contain many pictures. Members can reply and add their comment. Members can upload their photos and other photos. There will be private messages between users. The visitors will be arround 2,000,000, every day.

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