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  • Empirical evidence regarding testability

    - 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, but I can't find any studies which actually demonstrate this. Can someone link me to a study evaluating the effect of testable code vs. quality? The closest I can find is Improving the Testability of Object Oriented Systems, which discusses the relationship between design flaws and testability.

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  • Keeping your options open in a cloud solution

    - by BuckWoody
    In on-premises solutions we have the full range of options open for a given computing solution – but we don’t always take advantage of them, for multiple reasons. Data goes in a Relational Database Management System, files go on a share, and e-mail goes to the Exchange server. Over time, vendors (including ourselves) add in functionality to one product that allow non-standard use of the platform. For example, SQL Server (and Oracle, and others) allow large binary storage in or through the system – something not originally intended for an RDBMS to handle. There are certainly times when this makes sense, of course, but often these platform hammers turn every problem into a nail. It can make us “lazy” in our design – we sometimes don’t take the time to learn another architecture because the one we’ve spent so much time with can handle what we want to do. But there’s a distinct danger here. In nature, when a population shares too many of the same traits, it can cause a complete collapse if a situation exploits a weakness shared by that population. The same is true with not using the righttool for the job in a computing environment. Your company or organization depends on your knowledge as a professional to select the best mix of supportable, flexible, cost-effective technologies to solve their problems, whether you’re in an architect role or not.  So take some time today to learn something new. The way I do this is to select a given problem, and try to solve it with a technology I’m not familiar with. For instance – create a Purchase Order system in Excel, then in Hadoop or MongoDB, or even in flat-files using PowerShell as an interface. No, I’m not suggesting any of these architectures are the proper way to solve the PO problem, but taking something concrete that you know well and applying that meta-knowledge to another platform will assist you in exercising the “little grey cells” and help you and your organization understand what is open to you. And of course you can do all of this on-premises – but my recommendation is to check out a cloud platform (my suggestion would of course be Windows Azure :) ) and try it there. Most providers (including Microsoft) provide free time to do that.

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  • An Introduction to PowerShell Modules

    For PowerShell to provide specialised scripting, especially for administering server technologies, it can have the range of Cmdlets available to it extended by means of Snapins. With version 2 there is an easier and better method of extending PowerShell: the Module. These can be distributed with the application to be administered, and a wide range of Cmdlets are now available to the PowerShell user. Powershell has suddenly grown up.

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  • How do you check out what's hot in the open source space?

    - by Fanatic23
    I am trying to look for resources (sites, magazines, blogs, twitter etc) that track what's hot and happening in the open source space. This is programming language agnostic, I am more interested in knowing what kind of cool apps people are coming up these days particularly in the enterprise and scientific computing space. I am also into compilers, debuggers and other low level stuff. Any help appreciated.

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  • Windows Azure Cloud Supports SUSE Linux

    The enterprise level Linux distribution can now run in Windows Azure Virtual Machines. If you're interested in using Microsoft's cloud computing platform and run the open source operating system, Azure now supports OpenSUSE 12.1, CentOS 6.2, Ubunto 12.04 and SUSE Linux Enterprise Server 11 SP2. Windows Azure now provides what Microsoft characterizes as Infrastructure as a Service (IaaS) capabilities, not only for the Linux distributions named above, but for Windows Server 2008 R2 and the Windows Server 2012 Release Candidate. If you're a fan of automation, you'll appreciate the ability to use...

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  • Apps Script Office Hours - October 25, 2012

    Apps Script Office Hours - October 25, 2012 - Arun announces an election sample app - soon! Look for the blog post on googleappsdeveloper.blogspot.com - LAX hackathon googleappsdeveloper.blogspot.com - Bill (Google Hangout) asks about ScriptDb. Ikai makes a long analogy about libraries and datastores and offers possible explanations for why certain issues occur, as well as some of the difficulties in working with distributed datastores. From: GoogleDevelopers Views: 48 6 ratings Time: 29:34 More in Science & Technology

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  • Déploiement d'une instance GNU/Linux Debian 7 sous CloudStack, premier tutoriel d'une série sur Cloudstack

    Bonjour, Citation: CloudStack est un logiciel de cloud computing open source pour la création, la gestion et le déploiement de services de cloud d'infrastructure. Il utilise des hyperviseurs existants tels que KVM, vSphere, XenServer et / XCP pour la virtualisation. En plus de sa propre API, CloudStack prend également en charge les Amazon Web Services. Voici une série de tests effectués par Ikoula sur ce logiciel. Je vous présente ce tutoriel sur Cloudstack:Déploiement d'une instance...

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  • SAP multiplie les annonces sur son Cloud, nouvel environnement de développement et nouvelles applications prévus

    SAP multiplie les annonces sur son Cloud Nouvel environnement de développement et nouvelles applications prévus Le Cloud Computing était au coeur du SAPPHIRE NOW 2011 et sera au centre des préoccupation de SAP France pour l'année à venir. L'éditeur allemand affirme clairement aujourd'hui qu'il s'agit, pour lui, d'un « changement de paradigme sur le marché, d'une façon orchestrée qui offre une véritable valeur métier aux entreprises ». Pour renforcer sa stratégie, SAP multiplie d'ailleurs les annonces. Comme par exemple celle du rach...

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  • Are there any good Java/JVM libraries for my Expression Tree architecture?

    - by Snuggy
    My team and I are developing an enterprise-level application and I have devised an architecture for it that's best described as an "Expression Tree". The basic idea is that the leaf nodes of the tree are very simple expressions (perhaps simple values or strings). Nodes closer to the trunk will get more and more complex, taking the simpler nodes as their inputs and returning more complex results for their parents. Looking at it the other way, the application performs some task, and for this it creates a root expression. The root expression divides its input into smaller units and creates child expressions, which when evaluated it can use to build it's own result. The subdividing process continues until the simplest leaf nodes. There are two very important aspects of this architecture: It must be possible to manipulate nodes of the tree after it is built. The nodes may be given new input values to work with and any change in result for that node needs to be propagated back up the tree to the root node. The application must make best use of available processors and ultimately be scalable to other computers in a grid or in the cloud. Nodes in the tree will often be updating concurrently and notifying other interested nodes in the tree when they get a new value. Unfortunately, I'm not at liberty to discuss my actual application, but to aid understanding a little bit, you might imagine a kind of spreadsheet application being implemented with a similar architecture, where changes to cells in the table are propagated all over the place to other cells that need the result. The spreadsheet could get so massive that applying multi-core multi-computer distributed system to solve it would be of benefit. I've got my prototype "Expression Engine" working nicely on a single multi-core PC but I've started to run into a few concurrency issues (as expected because I haven't been taking too much care so far) so it's now time to start thinking about migrating the Engine to a more robust library, and that leads to a number of related questions: Is there any precedent for my "Expression Tree" architecture that I could research? What programming concepts should I consider. I realise this approach has many similarities to a functional programming style, and I'm already aware of the concepts of using futures and actors. Are there any others? Are there any languages or libraries that I should study? This question is inspired by my accidental discovery of Scala and the Akka library (which has good support for Actors, Futures, Distributed workloads etc.) and I'm wondering if there is anything else I should be looking at as well?

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  • Déploiement et configuration réseau d'une instance CloudStack, deuxième tutoriel d'une série sur Cloudstack

    Bonjour, Citation: CloudStack est un logiciel de cloud computing open source pour la création, la gestion et le déploiement de services de cloud d'infrastructure. Il utilise des hyperviseurs existants tels que KVM, vSphere, XenServer et / XCP pour la virtualisation. En plus de sa propre API, CloudStack prend également en charge les Amazon Web Services. Voici une série de tests effectués par Ikoula sur ce logiciel. Je vous présente ce deuxième tutoriel sur Cloudstack:Déploiement...

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  • Déploiement et configuration réseau (firewall) d'une instance CloudStack avec Apache préinstallé, troisième tutoriel d'une série sur Cloudstack

    Bonjour, Citation: CloudStack est un logiciel de cloud computing open source pour la création, la gestion et le déploiement de services de cloud d'infrastructure. Il utilise des hyperviseurs existants tels que KVM, vSphere, XenServer et / XCP pour la virtualisation. En plus de sa propre API, CloudStack prend également en charge les Amazon Web Services. Voici une série de tests effectués par Ikoula sur ce logiciel. Je vous présente ce troisième tutoriel sur Cloudstack:Déploiement...

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  • Programs and memory consumption [closed]

    - by cobie
    I have a 4gb ram macbook pro but I still run out of memory when I have chrome and a few other light weight applications open such as multiple windows of macvim. These programs are written in C/C++ so technically should be memory efficient but why do they suck up all these memory. is it just bad engineering or graphical user interfaces because I have read about incredible feats performed in software dev back in the early computing days with very limited memory but now it just feels like the applications expand to fill all my memory.

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  • Intel lance un concours de création d'applications pour sa caméra 3D RealSense, avec plus d'un million de dollars US à se partager

    Intel lance un concours de création d'applications pour sa caméra 3D RealSense, avec plus d'un million de dollars US à se partager Mise à jour du 18/08/2014Intel annonce l'édition 2014 de son concours Perceptual Computing App Challenge articulé autour de sa technologie RealSense. Pour rappel, sa caméra 3D RealSense a été présentée comme étant son premier produit « d'informatique perceptuelle » et embarque entre autre un système de reconnaisse faciale, vocale, la suppression des arrières plans,...

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  • Déployer une instance Debian 7 avec un WordPress prêt à l'emploi en quelques secondes avec CloudStack, quatrième tutoriel d'une série sur Cloudstack

    Bonjour, Citation: CloudStack est un logiciel de cloud computing open source pour la création, la gestion et le déploiement de services de cloud d'infrastructure. Il utilise des hyperviseurs existants tels que KVM, vSphere, XenServer et / XCP pour la virtualisation. En plus de sa propre API, CloudStack prend également en charge les Amazon Web Services. Voici une série de tests effectués par Ikoula sur ce logiciel. Je vous présente ce quatrième tutoriel sur Cloudstack:Déployer...

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  • No screens found error with glasen/intel-driver

    - by pgcudahy
    A lot of people seem to have had success in getting hardware acceleration for intel 82852/855GM chipsets with the ppa:glasen/intel-driver. I've tried it on my Motion Computing M1400 but get a "no screens found" error. I've found one person out there with a similar problem who seemed to fix it, but his solution is in German and seems to involve recompiling the kernel (it's at the bottom of the comments). Anyone able to see how to fix this without such drastic measures?

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  • git commit –m “CodePlex now supports Git!”

    Finally, yes, CodePlex now supports Git! Git has been one of the top rated requests from the CodePlex community for some time: Admittedly, when we launched CodePlex, we never expected that at some point we would be running a source control system originally invented by Linus Torvalds to use for the Linux kernel. Though I would also say, nobody would have thought the open source ecosystem would be as important to Microsoft as it has become now. Giving CodePlex users what they ask for and supporting their open source efforts has always been important to us, and we have a long list of improvements planned, so stay tuned as we have more up our sleeves! Why Git? So why Git? CodePlex already has Mercurial for distributed version control and TFS (which also supports subversion clients) for centralized version control. The short answer is that the CodePlex community voted, loud and clear, that Git support was critical. Additionally, we just like it, we use Git on our team every day and making the DVCS workflows more available to the CodePlex community is just the right thing to do. Forks and Pull Requests One of the capabilities that distributed version control systems, such as Mercurial and Git, enable is the Fork and Pull Request workflow.  Just like with Mercurial, projects configured to use Git enable Forking the source and submitting contributions back via Pull Requests. The Fork/Pull Request workflow is a key accelerator to many open source projects and you will see improvements in our support coming later this year. More Choice With the addition of Git, now CodePlex has three options when it comes to Open Source project hosting. Projects can now select between TFS, Mercurial, and Git. Each developer has their own preferences, and for some, centralized version control makes more sense to them. For others, DVCS is the only way to go. We’re equally committed to supporting both these technologies for our users. You can get started today by creating a new project or contribute to an existing project by creating a fork. For help on getting started with Git on CodePlex, see our help documentation here. If you would like to switch your project to use Git, please contact us at CodePlex Support with your project information, and we will be happy to help you out. We're Listening CodePlex is your community, and we want to deliver the experiences you need to have a successful open source project. We want your ideas and feedback to make CodePlex a great development community.  The issue tracker on CodePlex is publicly available. Add suggestions or vote up existing suggestions. And you can always find us on Twitter, I’m @mgroves84; follow us to keep up to date with our latest releases: @codeplex

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  • CloudCruiser Chargeback in the cloud

    - by llaszews
    Another company that does chargeback has just been pointed out to me: CloudCruiser There is interesting quote on this company's web site: "Accurate and transparent chargeback is a key requirement in this age of cloud computing. By 2015, we forecast more than 50% of the Global 2000 will charge back most IT costs using service-based pricing, up from less than 10% today. New integrated tools will be needed to implement IT service-based chargeback." - Jay Pultz, Vice President and Distinguished Analyst, Gartner

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  • Welcome Xsigo Partners

    - by Cinzia Mascanzoni
    Oracle recently achieved LEC for Xsigo Systems, Inc. and the migration of legacy partners is underway. Welcome Kits were distributed to partners providing details on how to join Oracle PartnerNetwork and next steps to jump start their business with Oracle. To find out more about the transition of Xsigo Partners, view the recently updated FAQ here.

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  • MeeGo, the new netbook Linux, arrives

    <b>Cyber Cynic:</b> "Take one part Intel's Moblin, mix with Nokia's Maemo, bake for three months in the Linux Foundation oven, and you get MeeGo. Linux Foundation executive director, Jim Zemlin has called this new embedded Linux, the open-source uber-platform for the next generation of computing devices:"

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  • OpenStack s'ouvre à Java et PHP, Rackspace publie deux kits de développement pour la plateforme Cloud open source

    OpenStack s'ouvre à PHP et Java Rackspace publie deux kits de développement pour la plateforme Cloud open source OpenStack, la plateforme de Cloud computing public et privé open source qui bénéficie du support des géants de l'IT comme Cisco ou encore HP, est actuellement sous les feux des projecteurs à l'occasion de la conférence OpenStack summit qui se déroule actuellement à San Diego. [IMG]http://idelways.developpez.com/news/images/openstack-logo.gif[/IMG] L'évènement annuel qui s'achèvera le 18 octobre est l'occasion pour les différents acteurs qui utilisent l'écosystème de présenter leurs produits et les évolutions de la plateforme.

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