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• Microsoft dévoile la version CTP de Dryad et DryadLINQ pour le développement parallèle et distribué

  Microsoft dévoile la version CTP de Dryad et DryadLINQ Pour le développement parallèle et distribué Microsoft vient de publier la version CTP de ses environnements de calculs parallèles et distribués qui seront commercialisés dans les semaines à venir, Dryad et DryadLINQ. Dryad est un moteur de calcul haute performance pour des calculs distribués, conçu pour simplifier la mise en oeuvre d'applications distribuées. DryadLINQ, lui, permet aux développeurs d'implémenter des applications Dryad en code managé à l'aide d'une version étendue du modèle de programmation LINQ. A la base, la technologie Dryad était un projet de recherche de Microsoft pour l'exécution des donnée...

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• What is the best way to work with large databases in Java depending on context?

  - by user19000

  We are trying to figure out the best practice for working with very large DBs in Java. What we do is a kind of BI (business Intelligence), i.e analyzing very large DBs, and using them to create intermediate DBs that represent intelligent knowledge of the DBs. We are currently using JDBC, and just preforming queries using a ResultSet. As more and more data is being created, we are wondering whether more appropriate ways exist for parsing and manipulating these large DBs: We need to support 'chunk' manipulation and not an entire DB at once(e.g. limit in JDBC, very poor performance) We do not need to be constantly connected since we are just pulling results and creating new tables of our own. We want to understand JDBC alternatives, with respect to advantages and disadvantages. Whether you think JDBC is the way to go or not, what are the best practices to go by depending on context (e.g. for large DBs queried in chunks)?

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• The Digital Video Recorder (DVR) is old news, the IP TV is the new generation.

  Its been more than 10 years since the first DVR came out in the US, the idea that you wont be wasting time by programming your video to record a show. Tivo was the first company to bring the idea of a hard disk to store your programs as well as the recurring shows recorded. Its being more than 10 years since that technology advance that improved the live of many families, yet after 10 years the technology hasnt improved much besides all cable and satellite companies provide their own device without...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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• Do you use ReSharper full time, or only enable it when needed?

  - by gorohoroh

  Based on a multitude of questions related to temporarily disabling ReSharper, and also on certain research data, I can see that a considerable share of ReSharper users have it disabled most of the time. They tend to enable it for a limited period of time (say, several hours), do whatever they need to do using its functionality, and disable it back until the next time they feel they need to use it. If you're using ReSharper (or other similar VS extensions, to that matter) in such occasional manner, can you clarify why you're doing this? Is your behavior based on performance, or other considerations? What kinds of tasks do you enable ReSharper for in this scenario?

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• Detailed Modern Opengl Tutorial?

  - by Kogesho

  I am asking for a specific modern opengl tutorial. I need a tutorial that does not skip to explain any lines of code. It should also include different independent objects moving/rotating (most tutorials use only one object), as well as imported 3d objects and collision detection for them. It should also avoid stuff that won't be used. Arcysnthesis for example gives a new concept, and after teaching it, in the next tutorial, it explains how bad it is for performance and introduces another method. Do you know any?

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• Is shared hosting enough for feed reader app?

  - by Mahdi

  I'm developing an Feed reader app. Feeds are downloaded to my server when someone requests it. then they download to user's computer. There will be 1-2 minutes cache for popular feeds. We expect that there will be 1000-5000 users (that use our app) Is a shared hosting (which currently serves almost 100 website, and it will serve 500 websites at maximum) enough for this purpose? or we should look for VPS or Dedicated hosting? Note: Our shared hosting plan has unlimited disk space and unlimited bandwidth.

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• Is there a way to recover a file that I have deleted but is still open somewhere?

  - by George Edison

  This question is related to How to recover deleted files? but it is slightly different in nature. Suppose I have a file named ~/something open in a text editor. Further suppose that I open a terminal and run the following command while the file is still open in the text editor: rm ~/something This will delete the file. Now suppose that I changed my mind and wanted to get the file back. The file is still open in the text editor, so it hasn't been removed from the disk or filesystem yet. Is there any way to recover it?

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• Gaming with ATI open-source drivers

  - by user7174

  I have recently bought humble bundle 2 ( http://www.humblebundle.com/ ). Is there a way to run Braid using ATI's open-source drivers? The game always crashes. When do get it to start in windowed mode once i go to the first level it will crash. I am using the lastest version of Braid (ST3C ignored) When I use the proprietary drivers Braid works flawlessly and World of Goo performance is increased. However there is terrible screen tearing with the ATI propritary drivers. So my question is: How do I play Braid if I want to use the proprietary drivers?

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• Enhancing Enterprise Planning and Forecasting Through Predictive Modeling

  Planning and forecasting performance in today's volatile economic environment can be challenging with traditional planning applications and manual modeling techniques. To address these challenges, leading edge companies are leveraging predictive modeling to bring statistical analysis and techniques such as Monte Carlo simulations into the mix. Sound too math-intense and complicated? Not anymore. These techniques can be applied by anyone - no prior stats experience required - whether to augment the forecasting performed by line managers or to validate those forecasts based on historical information, and to produce a broader range of scenarios to consider in decision-making.

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• Learning PostgreSql: Embracing Change With Copying Types and VARCHAR(NO_SIZE_NEEDED)

  - by Alexander Kuznetsov

  PostgreSql 9.3 allows us to declare parameter types to match column types, aka Copying Types. Also it allows us to omit the length of VARCHAR fields, without any performance penalty. These two features make PostgreSql a great back end for agile development, because they make PL/PgSql more resilient to changes. Both features are not in SQL Server 2008 R2. I am not sure about later releases of SQL Server. Let us discuss them in more detail and see why they are so useful. Using Copying Types Suppose...(read more)

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• What is the most complicated data structure you have used in a practical situation?

  - by Fanatic23

  The germ for this question came up from a discussion I was having with couple of fellow developers from the industry. Turns out that in a lot of places project managers are wary about complex data structures, and generally insist on whatever exists out-of-the-box from standard library/packages. The general idea seems to be like use a combination of whats already available unless performance is seriously impeded. This helps keeping the code base simple, which to the non-diplomatic would mean "we have high attrition, and newer ones we hire may not be that good". So no bloom filter or skip-lists or splay trees for you CS junkies. So here's the question (again): Whats the most complicated data structure you did or used in office? Helps get a sense of how good/sophisticated real world software are.

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• Using Ubuntu to recover data from a crashed Windows install

  - by user289391

  I was using Windows on my laptop when suddenly the blue screen of death appeared and then laptop restarted and wrote for me this : Intel UNDI, PXE-2.1 (built 083) Copyright (C) 1997-200 Intel Corporation This Product is covered by one or more of the following patents: US5,307459, US5,434,872, US5732,094, US6579,884, US6115,776 and US6,327,625 Realtek PCIe FE Family Controller Series v120 (01/26/10) PXE-M0F: ExitingPXEROM. reboot failed I have Ubuntu on an external disk so I have now booted to that. Two questions: Any theories on what happened? How can I use Ubuntu to recovers my data from Windows install?

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• Wireless Very slow with 13.10 and BCM4313

  - by RyanCheu

  I have a laptop with the BCM4313, and it was working perfectly in Ubuntu 13.04, but I recently upgraded to 13.10 and now my wireless performance is horrible. Initially it didn't work at all, but I removed the wl driver and use the brcmsmac driver instead. Now when I boot up it works at the start, but gets progressively slower. My Android device is reporting 10Mbps down/20Mbps up, but my laptop only gets 1up/down. Does anyone know a solution? I really need my wireless to work, is my best option to just reinstall on 13.04? Thanks!

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• If you want to learn all about Exalogic in 6 minutes, watch this demo!

  - by Michael Palmeter (Exalogic PM)

  If you haven't seen the latest Exalogic demo, click here now. Our excellent marketing organization has recently produced a new 6-minute flash demo that describes the Exalogic Infrastructure-as-a-Service management UI.  After years of investment in this product we are now in the final stages of delivering on the complete private-cloud-in-a-box vision that Larry Ellison announced back at Oracle OpenWorld 2010.  This demo video (flash) does the best job yet of explaining what is so great about Exalogic and why it is going to drive transformation of our industry.  If you haven't seen it yet, take a look.  There's much more to Exalogic now than just blazing performance.

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• Why is not there a python compiler to native machine's code?

  - by user2986898

  As I understand, the cause of the speed difference between compiled languages and python is, that the first compiles code all way to the native machine's code, whereas python compiles to python bytecode, to be interpreted by the PVM. I see that this way python codes can be used on multiple operation system (at least in most cases), however I do not understand, why is not there an additional (and optional) compiler for python, which compiles the same way as traditional compilers. This would leave to the programmer to chose, which is more important to them; multiplatform executability or performance on native machine. In general; why are not there any languages which could be behave both as compiled and interpreted?

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• replacing kernel on non-booting ec2 instance

  - by TheToolBox

  So I had an amazon ec2 instance crash during the update to 14.04LTS. Frustratingly, it appears the kernel might be bad (or at least that's what the log below says to me, I could totally be wrong). I'm able to mount the volume to another, working server, chroot the broken volume, and sudo apt-get remove linux-headers-3.MOSTRECENT. Unfortunately though, when I try sudo update-grub, it comes back with /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?). What am I missing? Here's the log from the server's attempted bootup: [H[J Booting 'Ubuntu 14.04 LTS, memtest86+' root (hd0) Filesystem type is ext2fs, using whole disk kernel /boot/memtest86+.bin ============= Init TPM Front ================ Tpmfront:Error Unable to read device/vtpm/0/backend-id during tpmfront initialization! error = ENOENT Tpmfront:Info Shutting down tpmfront xc: error: panic: xc_dom_core.c:621: xc_dom_find_loader: no loader found: Invalid kernel xc_dom_parse_image returned -1 close(3) Error 9: Unknown boot failure Press any key to continue... Thanks in advance!

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• Is there a future for AAA game development in C#? [closed]

  - by kasperov

  When XNA was released in 2006, I was happy and started doing indie attempts. After 3 years or so, there were lots of forum discussions on prospects of AAA game development in C#, and how a high performance vedio game can easily be programmed in C#. Suddenly after 2-3 more years, these discussions have died down and everybody seems like recommending native C++... What programming language should I practice on for long term? Should I stick with C# or do an extra effort for C++? Will AAA game companies adopt C# as a replacement to C++? Note : I aim to work at a AAA game company.

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• No dual boot menu

  - by Christian Galo

  I formatted all of my disk and installed Ubuntu on my computer. I immediately partitioned, from an Ubuntu live CD, my hard drive, creating an NTFS partition for for Windows. After successfully doing so, I went on to install windows 8.1. After I installed Windows 8 in the new partition and turned off my PC and turned it on again the option to chose which Operating system I wanted to use didn't appear, loading Windows like if Ubuntu didn't exist. How can I have the option to chose which operating system I want to run or at least from which partition to boot from when I start my computer? EVERYTHING IS OKAY WITH MY OPERATING SYSTEM The only thing I need is for ubuntu to appear as an option on the boot menus

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• HELP: I Broke Ubuntu By Uninstalling Compiz

  - by tSquirrel

  I'm still getting used to Linux, having come from Windows. I was receiving an error that "compiz" had crashed a few times so I figured I'd uninstall it. sudo apt-get remove compiz sudo apt-get install compiz I logged out then back in, after that, the GUI was totally gone and I have no idea how to get it back or what I need to do to restore the GUI to what it was before I killed poor Compiz. GUI was pretty much unmodified after a fresh install of 14.04 How can I fix it? I'm not even sure how to get to a terminal or anything. The login screen looks normal, but after logging in, it's a totally bare desktop with my backround and a few icons. No Dash, toolbar, etc. Hot Keys don't seem to work either (Super = Dash doesn't work, etc); although I did accidently open "Disk" UI. Not sure how. Please Help! Right now I'm working off my W7 dualboot.

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• Please Help to bring back power to my machine

  - by Acess Denied

  I Have a samsung N150plus netbook That I have been using for a while now. I left it on and plugged to a wall outlet and went to bed. I dual boot ubuntu and win7. I tried to update the win7 to sp1 and I dozed off. I woke up and saw the machine has been booted to ubuntu and logged in as guest, which translate to mean one of my room mates have tried to use the machine and they all have denied using my machine. I tried to reboot to windows and then it appears to have no cpu, hard disk and cpu fan activity. only one led seems to come on when i plug it in. its only the led that indicate the machine is powered on powers steadily. I really cant afford to buy a new machine now and I need the machine to complete my last project in school for my last year. Help Please

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• How do you configure mupen64plus controls?

  - by user99426

  I installed mupen64plus from the repositories using Synaptic. I like the emulator (for the most part, a couple of graphics glitches on TLOZ Ocarina of Time), especially its performance on my old machine, but I cannot figure out how to configure the controls for myself. I tried looking at Google Code's guide here but I can't find the file I need to edit and the link with the key ids isn't working, so even if I could find the file I wouldn't be able to change anything. So what I need is a resource with the key ids and where to find the file I need to edit. I am running Ubuntu 12.10 32-bit. 2GB RAM, Intel CORE 2 DUO @ 2.00GHz

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• Initialize array in amortized constant time -- what is this trick called?

  - by user946850

  There is this data structure that trades performance of array access against the need to iterate over it when clearing it. You keep a generation counter with each entry, and also a global generation counter. The "clear" operation increases the generation counter. On each access, you compare local vs. global generation counters; if they differ, the value is treated as "clean". This has come up in this answer on Stack Overflow recently, but I don't remember if this trick has an official name. Does it? One use case is Dijkstra's algorithm if only a tiny subset of the nodes has to be relaxed, and if this has to be done repeatedly.

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• apt-get not recognizing downloaded archives

  - by meteors

  I installed Ubuntu Gnome 13.10. I previously had Ubuntu Gnome 13.04 and had all the archives in the /var/cache/apt/archives/ stored to a removable disk. After installing 13.10 I copied all my archives to the above mentioned path. When I run apt-get install it tries to fetch the archives although I have the archives. Also if instead of apt-get install if I try to install individual .deb files using dpkg -i everything runs fine. These are the permissions of files: How do I fix this. Previously copying archives like this worked fine and downloading duplicates the files.

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• Windows Azure CDN(Content Delivery Network)

  - by kaleidoscope

  Windows Azure CDN caches your Windows Azure blobs at strategically placed locations to provide maximum bandwidth for delivering your content to users. You can enable CDN delivery for any storage account via the Windows Azure Developer Portal. The CDN provides edge delivery only to blobs that are in public blob containers, which are available for anonymous access. Windows Azure CDN has 18 locations globally (United States, Europe, Asia, Australia and South America) and continues to expand. The benefit of using a CDN is better performance and user experience for users who are farther from the source of the content stored in the Windows Azure Blob service. In addition, Windows Azure CDN provides worldwide high-bandwidth access to serve content for popular events. Current CDN locations in US. For more details please refer to the link.  http://blogs.msdn.com/windowsazure/archive/2009/11/05/introducing-the-windows-azure-content-delivery-network.aspx Sarang

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• Drawing flaming letters in 3d on OpenGL ES 2.0

  - by Chiquis

  I am a bit confused about how to achieve this. What i want is to "draw with flames". I have achieved this with textures successfully, but now my concern is about doing this with particles to achieve the flaming effect. Am I supposed to have a Path in where i should add many particle emitters along the path that will "be emitting flames"? I understand the concept for 2d, but for 3d are the particles (that are quads) always supposed to be facing the user? Edit: Something else im worried about is the performance hit that will occur by having that many particle emitters, because there can be many letters and drawings at the same time. And each of these elements will have many particle emitters.

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