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  • If I use locks, can my algorithm still be lock-free?

    - by Joe Pension
    A common definition of lock-free is that at least one process makes progress. 1 If I have a simple data structure such as a queue, protected by a lock, then one process can always make progress, as one process can acquire the lock, do what it wants, and release it. So does it meet the definition of lock-free? 1 See eg M. Herlihy, V. Luchangco, and M. Moir. Obstruction-free synchronization: Double-ended queues as an example. In Distributed Computing, 2003. "It is lock-free if it ensures only that some thread always makes progress".

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  • SAP courtise les petites structures et les startups, l'éditeur veut faire savoir que ses solutions ne s'adressent pas qu'aux "gros"

    SAP courtise les petites structures et les start-ups Et veut faire savoir que ses solutions ne s'adressent pas qu'aux multinationales HANA n'est pas réservé aux multinationales. SAP a mis les petits plats dans les grands pour le faire savoir lors d'un « concours » de start-ups qui souhaitent utiliser la technologie de In-Memory Computing de l'éditeur allemand pour accélérer de manière drastique le traitement de leurs données ? et donc de leurs temps de calcul. Cette journée parisienne du « SAP Startup Forum » a vu défiler des entreprises très diverses. Certaines ont été lancées depuis plusieurs années (comme Kxen, qui crée des outils de « deuxième génération d'analyse pré...

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  • Effecient finding of long-range spotting targets

    - by nihohit
    I'm creating a top-down 2d strategy game, with a square grid map. So far, I've used Bresenham's line drawing algorithm in a circle to determine what's in LOS of each unit, and then targedt one of the targets in the circle. Now I find that this limits my units to shoot only at targets that they see. I want to extend my targeting algorithm to target any other unit in range of my weapon, even if they're out of sight range of this given unit, if they're "spotted" by another friendly unit. In other words, I want to enable usage of weapons with ranges longer than sight range. Is there a better way than iterating over all sighted units and computing range and LOSto each of them?

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  • Oracle Solaris 11.1 Now Available; Learn More About It at November 7th Webcast

    - by Larry Wake
    Oracle Solaris 11.1 is now available for download -- as detailed earlier, this update to Oracle Solaris 11.1 provides new enhancements for enterprise cloud computing. Security, network, and provisioning advances, in addition to significant new performance features, make an already great release even better. For more information, you can't do better than the upcoming launch event webcast, featuring a live Q&A with Solaris engineering experts and three sessions covering what's new with Oracle Solaris 11.1 and Oracle Solaris Cluster. It's on Wednesday, November 7, at 8 AM PT; register today.

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  • Help deciding on an area of study for a PhD [closed]

    - by ale
    I am going to start a PhD in about 1 year. My undergraduate degree is in computer science and my master's is in artificial intelligence. I want to get ideas about what's going to be hot in say 5 years i.e. what could I spend 3-4 years studying to potentially have expertise that will be applicable to industry and the computing world ? Impossible to answer factually but some ideas and thoughts would be great. I have narrowed my ideas down to AI (yes, even more AI) and information security. AI seems to becoming popular again but security is always a going to be useful. From a career point of view, if I were to stay working in software development then this might actually be the best move but I've always wanted to do a PhD! Many thanks :).

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  • Software Engineering: Off to a Bad Start?

    - by Bob Rhubart
    The opening remarks for Real Software Engineering, Living Social developer Glenn Vanderburg's keynote presentation at QCon 2012 in San Francisco, include this: The people who started the software engineering field and movement, from the very beginning, misunderstood two very important things: software and engineering. And as a result, the field went off in the wrong direction from the very start, and legitimized certain ways of doing things and certain paths of research that really have not been very fruitful. Vanderburg's presentation is fascinating, often funny, and well worth watching, especially in light of how cloud computing and other technological shifts are redefining IT roles. Related Content Dissing Architects, or "What's wrong with this coffee?" Out of the Tower, into the Trenches Readers react to "Out of the Tower; Into the Trenches" IT Architecture, Complex Systems, and Gardening Podcast: Who Gets to be a Software Architect?

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  • Java Thriving in Oracle's hands

    - by Tori Wieldt
    IDC has published a Technology Assessment of Oracle's stewardship of Java titled "The State of Java: Two and a Half Years After the Acquisition." The overall IDC opinion is that Java under Oracle's stewardship is thriving. Report highlights include: The successful delivery of Java SE 7, which had been stalled at Sun Microsystems Articulation of realistic road maps for Java EE 7 and Java SE 8 The healthy growth of the Java ecosystem The decisiveness with which Oracle handled the Apache Harmony dispute Key vendors joining the OpenJDK including IBM, Apple, and SAP More and more programming languages being hosted on the Java Virtual Machine(JVM) Java's role in major computing trends including Mobile, Cloud, Big Data and Social You can access the full report here (PDF).

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  • Database Insider - October 2012 issue

    - by Javier Puerta
    The October issue of the Database Insider newsletter is now available. (Full newsletter here) NEWS   Newly Launched Oracle Exadata X3 Redefines Extreme Performance At Oracle OpenWorld 2012, Oracle announced the general availability of Oracle Exadata Database Machine X3, a complete package of servers, storage, networking, and software that is massively scalable, secure, and fully redundant—and ideally suited for the varied and unpredictable workloads of cloud computing. Read More WEBCASTS What Are Oracle Users Doing to Improve Availability and Disaster Recovery? The Independent Oracle Users Group (IOUG) surveyed more than 350 data managers and professionals regarding planned and unplanned downtime, database high availability, and disaster recovery solutions. Download the report and watch the Webcast today.

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  • La RC de Internet Explorer 9 disponible pour la clôture des TechDays 2011, téléchargez-là et faîtes nous part de vos avis

    La RC de IE9 est disponible Avec Do Not Track, le support de WebM et met encore plus l'accent sur la sécurité Microsoft vient d'annoncer l'arrivée de la Release Candidate de IE9. Une nouvelle qui clôt en beauté les TechDays 2011, son salon dédiée cette année au Cloud Computing. Avec cette nouvelle étape, Internet Explorer 9 intègre toutes ses fonctionnalités finales. Il ne reste plus à l'équipe du projet qu'à corriger les bogues et les dernières imperfections avant la sortie officielle. Cette RC bénéficie d'un très léger toilettage de l'UI avec des onglets carrés (et non plus aux angles arrondies) qui peuvent à présent être placés en dessous d...

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  • Announcing: Sun Server X4-8

    - by uwes
    On June 3rd, Oracle announced the latest in its line of workload-specific, enterprise-class servers, the Sun Server X4-8. Co-engineered with Oracle software, these servers are based on the latest Intel® Xeon® E7-8895 v2 processor and are the first to include elastic computing features, maximizing performance by adapting to different workload demands in real time. This server is currently available for quoting, ordering and shipping. This product replaces the Sun Server X2-8.  Please read the Product Bulletin on Oracle HW TRC for more details. (If you are not registered on Oracle HW TRC, click here ... and follow the instructions..) For More Server Information: Why Buy How to Use x86 Server Family oracle.com OTN

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  • Is testable code actually more stable? [closed]

    - by Xodarap
    A google scholar search turns up numerous papers on testability, including models for computing testability, recommendations for how ones code can be more testable, etc. They all come with the assertion that more testable code is more stable, however I can't find any studies which actually demonstrate this. I tried looking for studies evaluating the effect of testable code vs. quality, however the closest I can find is Improving the Testability of Object Oriented Systems, which discusses the relationship between design flaws and testability. Is testable code is actually more stable? And why, or why not? Please back up your answers with references or evidence to back up your claim.

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  • Showing range on hexagonal grid

    - by user23673
    Here is the situation. I have hexagonal board,and a unit on it,with speed or move value 4.Diffrent terrain has a diffrent cost.When i click on the unit,game should show me a move range. My solution was to check each hex in range of 4,with A* pathfinding,and if path cost was less than 4 then this hex was in range.Finally game nicely show me range of that unit. My question is: Is there other solution to search for range on hex grids or square grid,because even if i am really proud of what i did in my solution,i think,it is a little to exaggerated?:)) What make me ask this question?I noticed that when unit speed is 4 or 6 or even 8,time to computing range for my computer was really good,but when speed was 10 and more i noticed that i needed to wait few second to compute.Well in real games i rather dont see something like this and my A* pathfinding is rather well optimized,so im thinking that my solution is wrong. Thanks for any replies.

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  • Spécial Rétrospective 2010 sur Développez : quels événements IT vous ont le plus marqué cette année ?

    Spécial Rétro 2010 Quels événements IT vous ont le plus marqué cette année ? En collaboration avec Idelways Cloud computing, mobiles, réseaux sociaux, HTML5, Wikileaks... l'année 2010 touche à sa fin et force est de constater qu'elle fut riche en rebondissements dans le domaine du développement et dans l'IT d'une manière générale. Cette année a tout particulièrement été marquée par le retour fracassant d'Oracle sur le devant de la scène médiatique. Rachats, poursuites judiciaires, forks, déclarations assassines, abandons et lancement de produits... bref, Oracle était partout en 2010. Tout a vraiment commencé après la

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  • OpenJDK In the News: Oracle Outlines Plans to Make the Future Java During JavaOne 2012 [..]

    - by $utils.escapeXML($entry.author)
    Phil Rogers, AMD Corporate Fellow and HSA Foundation President, joined Oracle on stage to discuss Project Sumatra, which was recently approved in the OpenJDK Community. Project Sumatra will explore how Java can be extended to support heterogeneous computing models for improved performance and power consumption.Oracle plans to propose Project Nashorn, a new JavaScript engine for the Java Virtual Machine (JVM), later this year in the OpenJDK Community. Oracle expects to enhance Project Nashorn with the support of several other OpenJDK Community contributors, including IBM, Red Hat and Twitter.The OpenJDK Community continues to host the development of the reference implementation of Java SE 8. Weekly developer preview builds of JDK 8 continue to be available from jdk8.java.net.Quotes taken from the 13th press release from Oracle mentioning OpenJDK, titled "Oracle Outlines Plans to Make the Future Java During JavaOne 2012 Strategy Keynote".

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  • Is there any way around the field-of-use restrictions in Java?

    - by Muton
    Current field-of-use restrictions defined in "Oracle Binary Code License Agreement for the Java SE Platform Products" prohibit its use in embedded systems. "General Purpose Desktop Computers and Servers" means computers, including desktop and laptop computers, or servers, used for general computing functions under end user control (such as but not specifically limited to email, general purpose Internet browsing, and office suite productivity tools). The use of Software in systems and solutions that provide dedicated functionality (other than as mentioned above) or designed for use in embedded or function-specific software applications... are excluded from this definition and not licensed under this Agreement. Do these restrictions also apply to OpenJDK and other possible implementations? Is the only way to use Java in such an environment to acquire a separate license from Oracle?

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  • Windows 8: Paradigm Shift

    You've probably heard a lot about the loss of the Start button in Windows 8. While it isn't completely lost - you can still get to it via a convoluted path - its disappearance is merely a sign of the rethinking that went into the operating system's creation. Window 8's designers made certain assumptions while building the new system: Users will interact with the operating system predominantly through a touch interface. Users will do their computing on mobile devices, and may in fact use several different devices for the same purposes. They may even want to get work done on devices they do n...

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  • Kworker consuming %100 CPU

    - by yusuf
    I have a process, named kworker which is continuously consuming 100% of the CPU's computing capacity. I have tried several possible solutions over a period of 3 months, but to no avail. I even got to upgrade to u + 1 (Ubuntu 12.10 Quantal Quetzal), but my effort was, again, fruitless. I desperately need some help, because, as is, this process is draining my computer's battery so fast, that makes linux usage a disappointing experience. It is noteworthy, that I do not have any such issues when I use windows, which results in twice as much battery life.

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  • Defining reliable SIlverlight 4 architecture

    - by doteneter
    Hello everybody, It's my first question on SO. I know that there were many topics on Silverlight and architecture but didn't find answers that satisfies me. I'm ASP.NET MVC developer and are used to work on architectures built with the best practices (loose coupling with DI, etc.) Now I'm faced to the new Silverlight 4 project and would like to be sure I'm doing the best choices as I'm not experienced. Main features required by the applications are as follows : use existing SQL Server Database but with possibility to move to the cloud. using EF4 for the data acess with SQL Server. exitensibility : adding new modules without changing the main host. loose coupling. I was looking at different webcasts (Taulty, etc.), blogs about Silverlight and came up with the following architecture. EF 4 for data access (as specified with the requirements) WCF RIA Services for mid-tiers controling access to data for queries and enabling end-to-end support for data validation, authentication and roles. MEF Support for enabling modules. Unity 2.0 for DI. The problem is that I don't know how to define a reliable architecture where all these elements play well together. Should I use a framework instead like Prism or Caliburn? But for now I'm not sure what scenarios they support. What's the best usages for Unity in Silverlight ? I used to use IoC in ASP.NET MVC for loos coupling and other things like interception for audit logging. It seems that for Silverlight Unity doesn't support Interception. I would like to use it to enable loose coupling and to enable to move to the cloud if needed. Thanks in advance for your help.

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  • Windows Azure WebRole stuck in a deployment loop

    - by Rob G
    I've been struggling with this one for a couple of days now. My current Windows Azure WebRole is stuck in a loop where the status keeps changing between Initializing, Busy, Stopping and Stopped. It never goes live, and I can can never see the website as a result. The WebRole is an "out of the box" MVC 2 application with Copy Local set to true on the Mvc dll and I haven't even tried hooking up a storage or WorkerRole yet, and there is nothing really happening inside the Start method that I can see would crash. I've really tried going back to basics to ensure nothing can complicate the process and the website launches without a problem on the Dev Fabric and yes it looks just like the standard "Home", "About" MVC app - just can't get it running in the cloud! Funny thing is, a few days ago, this exact package worked on the staging area in the cloud, and I could even see it in the browser - but could never get it swapped over to production, so I deleted everything and started from scratch, and now I can't even get it running on staging... Does anyone have any ideas on what I could do to diagnose this problem myself because since logging this problem on the forums 2 days ago, there has been no improvement or feedback. Any help appreciated, Regards, Rob G

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  • Grails 1.2.0 not finding plugins in the default repository.

    - by Padraic
    I do not know what changed in my environment, but all of a sudden I can not pull any plugins from the default repository. I went through the _*.groovy scripts and nothing has changed in my grails home directory and it appears that the default repository url is set correctly (DEFAULT_PLUGIN_DIST = "http://plugins.grails.org"). I am assuming it is an environment setting that changed on me, because if I switch to an old version of grails that I have installed, 1.1.1 for example, list-plugins is returning a full list of plugins. When I run grails list-plugins in my current 1.2.0 environment I get the following output: Welcome to Grails 1.2.0 - http://grails.org/ Licensed under Apache Standard License 2.0 Grails home is set to: /opt/grails-1.2.0 Base Directory: /Users/padraic/Projects/TestApplicationMachine Resolving dependencies... Dependencies resolved in 1633ms. Running script /opt/grails-1.2.0/scripts/ListPlugins_.groovy Environment set to development Reading remote plugin list ... Plug-ins available in the core repository are listed below: hibernate <1.3.0.RC2 -- Hibernate for Grails tomcat <1.3.0.RC2 -- Apache Tomcat plugin for Grails webflow <1.3.0.RC2 -- Spring Web Flow Plugin Reading remote plugin list ... Plug-ins available in the default repository are listed below: spock <0.4-groovy-1.7-SNAPSHOT -- Spock Integration - spockframework.org Plug-ins you currently have installed are listed below: cloud-foundry 0.2 -- Cloud Foundry Plugin for Grails hibernate 1.2.0 -- Hibernate for Grails tomcat 1.2.0 -- Apache Tomcat plugin for Grails I find it very strange that it only finds the spock plugin. It makes me thing that either a)it is going to the wrong repository or b)my version setting is incorrect. Any ideas? Thanks, Padraic

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  • Django 'ImproperlyConfigured' error after deployment on google app engine

    - by oreon
    Hello, I'm currently trying to get my first django project running on Google App Engine. I followed the instructions given here http://www.allbuttonspressed.com/projects/djangoappengine as best I could. Unfortunately I have run into some issues. Locally everything runs fine, no problems. I then tried to deploy my project to the cloud. This is where I'm totally stuck. I always receive 500 Server Errors coupled with google.appengine.runtime.DeadlineExceededError's. Every now and then I get the following error message in my logs, which I think is the root of the problem : <class 'django.core.exceptions.ImproperlyConfigured'>: ImportError projectyalanda.pricecompare: No module named projectyalanda.pricecompare Obviously something is wrong in the way I reference my django app. Why this is only an issue in the cloud is a mystery to me. The interesting part in the settings.py file is setup as following: INSTALLED_APPS = ( 'djangotoolbox', # 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'projectyalanda.pricecompare', ) I absolutely can't figure out why django/appengine wouldn't be able to find the module, especially since everything works perfectly locally. So where else can I look? The local folder structure is of course also correct as automatically done by django, so maybe something is messed up during deployment? How would I be able to find out? Please help me ;-) Thanks

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  • Launch command on remote Windows machine, given admin credentials

    - by Bilal Aslam
    I have a Windows Server 2008 instance on Amazon EC2 (Amazon's cloud compute platform, which provides VMs in the cloud). It has an external IP, and I have an admin account on the box. I would like to 'bootstrap' this instance remotely i.e. I want to run commands to download, install and configure apps on it, all without having to log on even once. I have figured out how to do this to a remote, domain-joined computer using WMI. I can even use psexec to get what I want, as long as the remote computer is part of the domain. However, I have NOT been able to do for a remote computer on EC2. Here are some specific restrictions: 1) The remote computer is not part of my domain, hence no Kerberos 2) The remote computer does not have a cert I trust, or vice versa I am sure I am running into to some auth/trust restriction. Is there any way I can run a single command on the remote, given that I have admin privileges? I'm not tied down to using WMI, but I do need to run a command somehow. Feels like this should be a solved problem.

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  • Flash/uploadify filereference.upload not working, unknown reason

    - by BotskoNet
    I've been using the uploadify jquery for a long time - this tool has been working on several different servers for quite a while. Recently, on rackspace cloud sites accounts, the uploads stopped working. There's been no change to our code and our code works perfectly on other servers. I'm having trouble finding the issue, here's what happens: The filereference.upload is called, we provide all of the proper info - url, filename, etc The URL is http, and is correct. When visited through a web browser it works All debugging and tracing show that our code is running correctly The DataEvent.UPLOAD_COMPLETE_DATA evens never trigger The ProgressEvent.PROGRESS events never trigger. Server access logs and application traffic logs never show any requests coming to the upload script. Based on all of this info, it seems that: Our script works fine, file.upload is called properly Event.OPEN is fired. Traffic never reaches the server No io/http errors are called. file.upload does return false, but it also returns false on servers that the upload works, and the complete events are called. We're not using any firewalls or proxies on our end, and these tools work perfectly on other servers. But, these sites that are on the rackspace cloud sites all share this problem. However, a site that was in development a few months ago worked just fine on the same rackspace ckoud sites account. Trying the flash build from that version still won't work now. How can I go about finding out what's breaking between the file.upload and the reaching the server?

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  • Is hardware accelerated CSS3 in Safari 4 & 5 broken, or my CSS and JS?

    - by Dan Forys
    Hi all, I've created a somewhat silly site that shows you the expected weather forecast for any city in the World. On webkit based browsers, when the weather is sunny a sun with CSS3 animated rotated sunbeams appears. This works fine on Chrome. An example (sunny, at the moment) page is: http://willitraintoday.co.uk/iceland/reykjavik/ However, when viewed in Safari 4 or 5 on Mac Snow Leopard, when the sun appears the sky background appears over it. Weirder still, as the cloud containing the advert moves across the sky, it squashes the main text. When the cloud reaches the left edge, the text appears wider than normal and starts squashing down again. I've tried: - Disabling the CSS3 animation; it works fine in Safari - Juggling the z-index of various elements; to no avail Is there something up with my Javascript or CSS, or is the hardware accelerated snow leopard Safari broken in this case? It seems not to happen in Safari 4 on Leopard, but I don't have Leopard any more to test myself. Grateful for any opinions!

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  • iPhone Development - calling external JSON API (will Apple reject?)

    - by RPM1984
    Ok guys, so im new to iPhone development, so apologies if this is a silly question, but before i actually create my app i want to know if this is possible, and if Apple will reject this. (Note this is all theoretical) So i'd have a API (.NET) that runs on a cloud server somewhere and can return HTML/JSON/XML. I'll have a website that can access this API and allow customers to do some stuff (but this is not important for this question). I would then like my iPhone app to make a call to this API which would return JSON data. So my iPhone app might make a call to http://myapp/Foos which would return a JSON string of Foo objects. The iPhone app would then parse this JSON and do some funky stuff with it. So, that's the background, now the questions: Is this possible? (that is, call an external cloud API over HTTP, parse JSON response?) What are the chances of Apple rejecting this application (because it would be calling a non-Apple API) Are there any limitations (security, libraries, etc) on the iPhone/Objective-C/Cocoa that might hinder this solution? On this website, they seem to be doing exactly what im asking. Thoughts, suggestions, links would be greatly appreciated...

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