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  • HTTP Push from SQL Server Comet SQL

    Article provides example solution for presenting data in "real-time" from Microsoft SQL Server in HTML browser. Article presents how to implement Comet functionality in ASP.NET and how to connect Comet with Query Notification from SQL Server....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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  • Details on Oracle's Primavera P6 Reporting Database R2

    - by mark.kromer
    Below is a graphic screenshot of our detailed announcement for the new Oracle data warehouse product for Primavera P6 called P6 Reporting Database R2. This DW product includes the ETL, data warehouse star schemas and ODS that you'll need to build an enterprise reporting solution for your projects & portfolios. This product is included on a restricted license basis with the new Primavera P6 Analytics R1 product from Oracle because those Analytics are built in OBIEE based on this data warehouse product.

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  • Apache log analyzer which manages time spent to serve the request

    - by antispam
    I need to monitor performance in my web server (there's an application server in the back) and create reports for senior management. I've enabled %T/%D in my Apache logs and I would like to know if there's an Apache log analyzer or some other tool which parses these values and manages them showing charts or reports. I am looking mostly for an integrated solution and not in the line of awk+gnuplot scripts.

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  • Bash Printing, how to

    - by Uncle Leo
    Wrote a script in bash. Now im need to bring information into a text file,for example in PostScript, but there is one problem. I need to have a certain length of string in characters, and stretch or shrink the string on the entire width of the page layout. I have tried a2ps and enscript, but there is no such option. Please tell me the solution to this problem, maybe in Ghostscript. Thanks in advance!

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  • Postgres 8.4 stackbuilder not run in Ubuntu12.04

    - by vikas
    I have installed Postgres 8.4 in my Ubuntu 12.04 , but after installation it does not run stackbuilder.It also not running from menu bar . How can i run stackbuilder ? edit:I install this from postgres-8.4.run package.It uses a GUI interface.After installing postgres it should run stackbuilder but it not run stackbuilder GUI. This prob is related to ubuntu 12.04 because in 11.04, I have used this application.This question also asked on other forms but there is no solution. Thank you.

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  • Partner Webcast – Oracle Coherence Applications on WebLogic 12c Grid - 21st Nov 2013

    - by Thanos Terentes Printzios
    Oracle Coherence is the industry leading in-memory data grid solution that enables organizations to predictably scale mission-critical applications by providing fast access to frequently used data. As data volumes and customer expectations increase, driven by the “internet of things”, social, mobile, cloud and always-connected devices, so does the need to handle more data in real-time, offload over-burdened shared data services and provide availability guarantees. The latest release of Oracle Coherence 12c comes with great improvements in ease of use, integration and RASP (Reliability, Availability, Scalability, and Performance) areas. In addition it features an innovating approach to build and deploy Coherence Application as an integral part of typical JEE Enterprise Application. Coherence GAR archives and Coherence Managed Servers are now first-class citizens of all JEE applications and Oracle WebLogic domains respectively. That enables even easier development, deployment and management of complex multi-tier enterprise applications powered by data grid rich features. Oracle Coherence 12c makes your solution ready for the future of big data and always-on-line world. This webcast is focused on demonstrating How to create a Coherence Application using Oracle Enterprise Pack for Eclipse 12.1.2.1.1 (Kepler release). How to package the application in form of GAR archive inside the EAR deployable application. How to deploy the application to multi-tier WebLogic clusters. How to define and configure the WebLogic domain for the tiered clusters hosting both data grid and client JEE applications.  Finally we will expose the data in grid to external systems using REST services and create a simple web interface to the underlying data using Oracle ADF Faces components. Join us on this technology webcast, to find out more about how Oracle Cloud Application Frameworks brings together the key industry leading technologies of Oracle Coherence and Weblogic 12c, delivering next-generation applications. Agenda: Introduction to Oracle Coherence What's new in 12c release POF annotations Live Events Elastic Data (Flash storage support) Managed Coherence Servers for Oracle WebLogic Coherence Applications (Grid Archive) Live Demonstration Creating and configuring Coherence Servers forming the data tier cluster Creating a simple Coherence Grid Application in Eclipse Adding REST support and creating simple ADF Faces client application Deploying the grid and client applications to separate tiers in WebLogic topology HA capabilities of the data tier Summary - Q&A Delivery Format This FREE online LIVE eSeminar will be delivered over the Web. Registrations received less than 24hours prior to start time may not receive confirmation to attend. Duration: 1 hour REGISTER NOW For any questions please contact us at partner.imc-AT-beehiveonline.oracle-DOT-com Stay Connected Oracle Newsletters

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  • Lightning is not compatible with Thunderbird 7.0.1

    - by Fredrik
    I reinstalled Ubuntu 11.10 the other day and now when I try to install the Lightning extension in Thunderbird it states: Lightning is not compatible with Thunderbird 7.0.1. As extra information lightning is not comming up automaticly when searching for it within Thunderbird. You need to download it manually. And also I had it installed before I reformated the computer. Anybody has a solution to this issue?

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  • Advice on Project Management Software?

    - by Zenph
    I was wondering, does anybody work as part of a team, or as a project manager who highly recommends a certain project management solution (self-hosted or otherwise) ? Ideally I want something where I can manage the entire project, and also manage the financial side of things too. Should also add a few other things: notifications for team members for individual projects version control integration (like codebase) real time collaboration like chat

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  • Should I be looking for an alternative to Zen Cart as my business grows?

    - by MarkS
    I created a business website for a family business which is growing. It's my family, and I'm a software developer, but I don't want to rebuild the wheels or be a shopping cart programmer. For this business, I need the web store to "just work", but... it gets complicated... There are two parts of this business website. One of them is driven by Wordpress and I use the awesome Thesis theme. This is modern, flexible, and saves me a lot of time from doing custom coding and styling. I couldn't be more pleased with this arrangement. The other part of the site is a Zen Cart store. It's administration and it's flexibility is frustrating and archaic Web 1.0. For the past few years, I keep hearing that the developers are working on a 2.0 version of Zen Cart, but they haven't communicated anything significant in the past few years other than to say, "When it's ready, we'll let you know." What I'm looking for in a cart, I would need to install 6-10 additional mods, and would need to do a lot of custom coding. I'm now willing to pay for a top-notch e-commerce solution for a small business that we can grow up into a larger business over time. Requirements: Extremely flexible shipping that let's us set up rules per product/category, tables of rates, calculated rates, max package weighs, etc. (flexibility like that available with CEON Advance Shipping Module for Zen Cart Coupons and gift certificates Manual order entry for phone orders Multi-channel support (We also sell on Amazon, eBay, use Google Base and we want to maintain one set of inventory and have it kept current) Decent SEO features Reviews and star-ratings on products Easy social networking features for sharing, following, liking, etc) Easy integration with AdWords and analytics tracking Modern and very usable product and store administration (Like I was saying, I'm spoiled by Wordpress and Thesis) At the end of the day, I don't care if it's a hosted solution or if I have to host it myself. I just want something that is going to stay up-to-date, regularly be maintained and improved, and if I have to update it, things like the one-click update present in Wordpress is something it has to have. Professional Webmasters, if you had to run a store / website, but you had to spend your time focusing on your sales and marketing efforts rather than diffing php files and copying and tweaking them to change even the slightest details of your site, what would you choose?

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  • ASP.NET MVC 3 Hosting :: How to Upgrade ASP.NET MVC 2 Project to ASP.NET MVC 3

    - by mbridge
    ASP.NET MVC 3 can be installed side by side with ASP.NET MVC 2 on the same computer, which gives you flexibility in choosing when to upgrade an ASP.NET MVC 2 application to ASP.NET MVC 3. The simplest way to upgrade is to create a new ASP.NET MVC 3 project and copy all the views, controllers, code, and content files from the existing MVC 2 project to the new project and then to update the assembly references in the new project to match the old project. If you have made changes to the Web.config file in the MVC 2 project, you must also merge those changes with the Web.config file in the MVC 3 project. To manually upgrade an existing ASP.NET MVC 2 application to version 3, do the following: 1. In both Web.config files in the MVC 3 project, globally search and replace the MVC version. Find the following: System.Web.Mvc, Version=2.0.0.0 Replace it with the following System.Web.Mvc, Version=3.0.0.0 There are three changes in the root Web.config and four in the Views\Web.config file. 2. In Solution Explorer, delete the reference to System.Web.Mvc (which points to the version 2 DLL). Then add a reference to System.Web.Mvc (v3.0.0.0). 3. In Solution Explorer, right-click the project name and then select Unload Project. Then right-click again and select Edit ProjectName.csproj. 4. Locate the ProjectTypeGuids element and replace {F85E285D-A4E0-4152-9332-AB1D724D3325} with {E53F8FEA-EAE0-44A6-8774-FFD645390401}. 5. Save the changes and then right-click the project and select Reload Project. 6. If the project references any third-party libraries that are compiled using ASP.NET MVC 2, add the following highlighted bindingRedirect element to the Web.config file in the application root under the configuration section: <runtime>   <assemblyBinding >     <dependentAssembly>       <assemblyIdentity name="System.Web.Mvc"           publicKeyToken="31bf3856ad364e35"/>       <bindingRedirect oldVersion="2.0.0.0" newVersion="3.0.0.0"/>     </dependentAssembly>   </assemblyBinding> </runtime> Another ASP.NET MVC 3 article: - Rolling with Razor in MVC v3 Preview - Deploying ASP.NET MVC 3 web application to server where ASP.NET MVC 3 is not installed - RenderAction with ASP.NET MVC 3 Sessionless Controllers

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  • Manageability at Oracle Openworld: a Guide to sessions for Partners

    - by Javier Puerta
    A large number of sessions focusing on Manageability will be taking place during the week of Oracle Openworld in San Francisco. To help you organize your schedule I am including below a list of sessions and events around Manageability that you will find of interest. PARTNER SPECIFIC SESSIONS Date/Time/Location  Session   Monday, October 1st, 2011 at 15:30 - 18:00 PST Grand Hyatt San Francisco 345 Stockton Street, San Francisco (Conference Theater) (It is a 15 minute walk from OOW Moscone Center. See directions here) Exadata & Manageability EMEA Partner Community Forum.- Listen to other partners share their experiences in selling and implementing Exadata and Manageability projects, and have a direct dialogue with some of the Oracle executives that are driving the strategy of the company in these areas. Agenda Welcome - Hans-Peter Kipfer, VP, Engineered Systems Oracle EMEA Next challenges in building and managing clouds - Javier Cabrerizo, VP, Business Development for Exadata, Oracle Corp. Partner Experiences: IT modernization, simplification and cost reduction: The case of a customer in Transportation & Logistics with custom applications and SAP. - Francisco Bermudez, Country Leader Infrastructure Services, Capgemini, Spain Nvision cloud project - Dmitry Krasilov, Head of Oracle Competence Center, Nvision Group, Russia From Exadata Ready to Exadata Optimized: An ISV Experience - Miguel Alves, Product Business Solutions Manager, WeDo Technologies, Portugal To confirm your participation send an email to [email protected] Tuesday, Oct 2, 11:45 AM - 12:45 PM - Marriott Marquis - Golden Gate A Developing Services for Private and Public Clouds.- The Oracle Cloud provides new business opportunities, secures business applications and data, and provides operational efficiencies and cost savings. For customers lacking the skill or time to architect, develop, or build a cloud, there is a growing demand for services practice partners that can deliver and manage Oracle Cloud solutions. In this session,• Become familiar with services examples and use cases that demonstrate how an Oracle Cloud can provide a solution to a customer’s needs today• Learn about Oracle architecture and best practices available for an Oracle Cloud instances• Identify the right Oracle technology and the optimal model for meeting customer needs while providing excellent revenues and an optimal margin for services delivered Wednesday, Oct 3, 1:15 PM - 2:15 PM - Marriott Marquis - Golden Gate B Using Management Already Built into Oracle Products: Oracle Enterprise Manager .- Engineered into Oracle products are management capabilities ready to be used. In this session, applicable to all partners, understand the growing market opportunities and how to use or include Oracle Enterprise Manager as part of your solution or services. Other Cloud sessions for Partners at the Oracle PartnerNetwork Exchange  Click here.-     OOW CUSTOMER SESSIONS   Download the Focus On Oracle Enterprise Manager Cloud Control 12c (and Private Cloud) guide for a full list of Exadata OOW sessions.  

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  • Silverlight Cream for April 22, 2010 -- #844

    - by Dave Campbell
    In this Issue: Miroslav Miroslavov, David Anson, Mike Snow, Jason Alderman, Denis Gladkikh, John Papa, Adam Kinney, and CrocusGirl. Shoutout: Mike Snow is moving his blog to Silverlight Tips of The Day... his first is a repeat of number 110 of the last list, but you'll want to bookmark the page. Falling in the 'too cool not to mention' category... Pete Brown posted another MIX10 interview: New Channel 9 Video: Josh Blake on NaturalShow Multi-touch in WPF Adam Kinney announced that the Upgrade to Expression Studio v4 for free – now in writing! From SilverlightCream.com: Visuals staring at the mouse cursor Miroslav Miroslavov at SilverlightShow has a first part post up on the design of the CompleteIT site... going through the 'follow the mouse' effect that is so cool on the main page... with source. Today's DataVisualizationDemos release includes new demos showing off stacked series behavior Falling squarly into the category of "when does he sleep"... David Anson has another Visualization post up today... adding a stacked series and Text-to-Chat sample. Silverlight: Unable to start Debugging. The Silverlight managed debugging package isn’t installed. Mike Snow has a tip up about what to do if you get an "Unable to start debugging" box when you crank up VS ... not a great solution, but it's a solution. Introducing Pillbox for Windows Phone The folks at Veracity definitely have way too much fun with technology :) ... check out the WP7 app that Jason Alderman blogged about... he has a link out to another page with screenshots... oh, AND the code... Export data to Excel from Silverlight/WPF DataGrid Denis Gladkikh demonstrates using COM Interop to export to Excel from both WPF and Silverlight. He discusses isses he had and has all the source for both platforms available. Silverlight TV 21: Silverlight 4 - A Customer's Perspective John Papa has Silverlight TV number 21 up and he's chatting with Franck Jeannin of Ormetis, Ward Bell of IdeaBlade, and Dave Wolf of Cynergy Systems, all presenters in the Keynote at DevConnections. Avatar Mosaic -Experimenting with the Artefact Animator Adam Kinney spent enough time with Artefact Animator to put up a lengthy post about it including his project. Artefact Animator itself is available on CodePlex, and Adam has the link... this looks like good stuff. Windows Phone 7 Design Notes – Part2: Metro + Adrian Frutiger CrocusGirl continues her WP7 Metro discussion with a great long post on background she's researched and some of her own work with typography... a great read. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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  • Attribute Overwriting in MDX

    - by Marco Russo (SQLBI)
    Jeffrey Wang wrote a great blog post about attribute overwriting in MDX that is very clear and full of helpful pictures to show what happens when you write an MDX statement that writes into your multidimensional space. This is very common in an MDX Script and if you tried to customize the DateTool solution you probably experienced how hard this concept can be. The point is not that MDX is hard, is that a model based on multiple hierarchies in a dimension (and each attribute is a hierarchy by default!)...(read more)

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  • What's New in PeopleSoft HCM 9.1?

    PeopleSoft HCM 9.1 is the most robust release in years with over 9,000 enhanced pages, 270 new features, 83 new Web services and 8 new solutions. Tune into this conversation with Jay Richey, Director, Product Marketing for Oracle PeopleSoft Enterprise Human Capital Management Solutions to understand how this solution can improve the effectiveness of your workforce, drive higher organizational productivity, and continue to leverage your strategic investment in PeopleSoft HCM.

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  • Configuration "diff" across Oracle WebCenter Sites instances

    - by Mark Fincham-Oracle
    Problem Statement With many Oracle WebCenter Sites environments - how do you know if the various configuration assets and settings are in sync across all of those environments? Background At Oracle we typically have a "W" shaped set of environments.  For the "Production" environments we typically have a disaster recovery clone as well and sometimes additional QA environments alongside the production management environment. In the case of www.java.com we have 10 different environments. All configuration assets/settings (CSElements, Templates, Start Menus etc..) start life on the Development Management environment and are then published downstream to other environments as part of the software development lifecycle. Ensuring that each of these 10 environments has the same set of Templates, CSElements, StartMenus, TreeTabs etc.. is impossible to do efficiently without automation. Solution Summary  The solution comprises of two components. A JSON data feed from each environment. A simple HTML page that consumes these JSON data feeds.  Data Feed: Create a JSON WebService on each environment. The WebService is no more than a SiteEntry + CSElement. The CSElement queries various DB tables to obtain details of the assets/settings returning this data in a JSON feed. Report: Create a simple HTML page that uses JQuery to fetch the JSON feed from each environment and display the results in a table. Since all assets (CSElements, Templates etc..) are published between environments they will have the same last modified date. If the last modified date of an asset is different in the JSON feed or is mising from an environment entirely then highlight that in the report table. Example Solution Details Step 1: Create a Site Entry + CSElement that outputs JSON Site Entry & CSElement Setup  The SiteEntry should be uncached so that the most recent configuration information is returned at all times. In the CSElement set the contenttype accordingly: Step 2: Write the CSElement Logic The basic logic, that we repeat for each asset or setting that we are interested in, is to query the DB using <ics:sql> and then loop over the resultset with <ics:listloop>. For example: <ics:sql sql="SELECT name,updateddate FROM Template WHERE status != 'VO'" listname="TemplateList" table="Template" /> "templates": [ <ics:listloop listname="TemplateList"> {"name":"<ics:listget listname="TemplateList"  fieldname="name"/>", "modified":"<ics:listget listname="TemplateList"  fieldname="updateddate"/>"}, </ics:listloop> ], A comprehensive list of SQL queries to fetch each configuration asset/settings can be seen in the appendix at the end of this article. For the generation of the JSON data structure you could use Jettison (the library ships with the 11.1.1.8 version of the product), native Java 7 capabilities or (as the above example demonstrates) you could roll-your-own JSON output but that is not advised. Step 3: Create an HTML Report The JavaScript logic looks something like this.. 1) Create a list of JSON feeds to fetch: ENVS['dev-mgmngt'] = 'http://dev-mngmnt.example.com/sites/ContentServer?d=&pagename=settings.json'; ENVS['dev-dlvry'] = 'http://dev-dlvry.example.com/sites/ContentServer?d=&pagename=settings.json';  ENVS['test-mngmnt'] = 'http://test-mngmnt.example.com/sites/ContentServer?d=&pagename=settings.json';  ENVS['test-dlvry'] = 'http://test-dlvry.example.com/sites/ContentServer?d=&pagename=settings.json';   2) Create a function to get the JSON feeds: function getDataForEnvironment(url){ return $.ajax({ type: 'GET', url: url, dataType: 'jsonp', beforeSend: function (jqXHR, settings){ jqXHR.originalEnv = env; jqXHR.originalUrl = url; }, success: function(json, status, jqXHR) { console.log('....success fetching: ' + jqXHR.originalUrl); // store the returned data in ALLDATA ALLDATA[jqXHR.originalEnv] = json; }, error: function(jqXHR, status, e) { console.log('....ERROR: Failed to get data from [' + url + '] ' + status + ' ' + e); } }); } 3) Fetch each JSON feed: for (var env in ENVS) { console.log('Fetching data for env [' + env +'].'); var promisedData = getDataForEnvironment(ENVS[env]); promisedData.success(function (data) {}); }  4) For each configuration asset or setting create a table in the report For example, CSElements: 1) Get a list of unique CSElement names from all of the returned JSON data. 2) For each unique CSElement name, create a row in the table  3) Select 1 environment to represent the master or ideal state (e.g. "Everything should be like Production Delivery") 4) For each environment, compare the last modified date of this envs CSElement to the master. Highlight any differences in last modified date or missing CSElements. 5) Repeat...    Appendix This section contains various SQL statements that can be used to retrieve configuration settings from the DB.  Templates  <ics:sql sql="SELECT name,updateddate FROM Template WHERE status != 'VO'" listname="TemplateList" table="Template" /> CSElements <ics:sql sql="SELECT name,updateddate FROM CSElement WHERE status != 'VO'" listname="CSEList" table="CSElement" /> Start Menus <ics:sql sql="select sm.id, sm.cs_name, sm.cs_description, sm.cs_assettype, sm.cs_assetsubtype, sm.cs_itemtype, smr.cs_rolename, p.name from StartMenu sm, StartMenu_Sites sms, StartMenu_Roles smr, Publication p where sm.id=sms.ownerid and sm.id=smr.cs_ownerid and sms.pubid=p.id order by sm.id" listname="startList" table="Publication,StartMenu,StartMenu_Roles,StartMenu_Sites"/>  Publishing Configurations <ics:sql sql="select id, name, description, type, dest, factors from PubTarget" listname="pubTargetList" table="PubTarget" /> Tree Tabs <ics:sql sql="select tt.id, tt.title, tt.tooltip, p.name as pubname, ttr.cs_rolename, ttsect.name as sectname from TreeTabs tt, TreeTabs_Roles ttr, TreeTabs_Sect ttsect,TreeTabs_Sites ttsites LEFT JOIN Publication p  on p.id=ttsites.pubid where p.id is not null and tt.id=ttsites.ownerid and ttsites.pubid=p.id and tt.id=ttr.cs_ownerid and tt.id=ttsect.ownerid order by tt.id" listname="treeTabList" table="TreeTabs,TreeTabs_Roles,TreeTabs_Sect,TreeTabs_Sites,Publication" />  Filters <ics:sql sql="select name,description,classname from Filters" listname="filtersList" table="Filters" /> Attribute Types <ics:sql sql="select id,valuetype,name,updateddate from AttrTypes where status != 'VO'" listname="AttrList" table="AttrTypes" /> WebReference Patterns <ics:sql sql="select id,webroot,pattern,assettype,name,params,publication from WebReferencesPatterns" listname="WebRefList" table="WebReferencesPatterns" /> Device Groups <ics:sql sql="select id,devicegroupsuffix,updateddate,name from DeviceGroup" listname="DeviceList" table="DeviceGroup" /> Site Entries <ics:sql sql="select se.id,se.name,se.pagename,se.cselement_id,se.updateddate,cse.rootelement from SiteEntry se LEFT JOIN CSElement cse on cse.id = se.cselement_id where se.status != 'VO'" listname="SiteList" table="SiteEntry,CSElement" /> Webroots <ics:sql sql="select id,name,rooturl,updatedby,updateddate from WebRoot" listname="webrootList" table="WebRoot" /> Page Definitions <ics:sql sql="select pd.id, pd.name, pd.updatedby, pd.updateddate, pd.description, pdt.attributeid, pa.name as nameattr, pdt.requiredflag, pdt.ordinal from PageDefinition pd, PageDefinition_TAttr pdt, PageAttribute pa where pd.status != 'VO' and pa.id=pdt.attributeid and pdt.ownerid=pd.id order by pd.id,pdt.ordinal" listname="pageDefList" table="PageDefinition,PageAttribute,PageDefinition_TAttr" /> FW_Application <ics:sql sql="select id,name,updateddate from FW_Application where status != 'VO'" listname="FWList" table="FW_Application" /> Custom Elements <ics:sql sql="select elementname from ElementCatalog where elementname like 'CustomElements%'" listname="elementList" table="ElementCatalog" />

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  • Wifi too slow on 11.10/12.04

    - by Jorge Pinho
    As the title above mentions, i've some issues with wireless connection on both ubuntu 11.10 and 12.04. I've installed the latest drivers (Atheros AR928x), like "compact-wireless package" on several machines including ubuntu 11.10. The connection still too slow. My internet connection is 100 mb so, using WLAN connection, it should give me 70/80 mb of signal... instead of the 40/50 mb that i'm experience right now.. Do you have a solution to increase the signal?

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  • Easy remote communication without WCF

    - by Ralf Westphal
    If you´ve read my previous posts about why I deem WCF more of a problem than a solution and how I think we should switch to asynchronous only communication in distributed application, you might be wondering, how this could be done in an easy way. Since a truely simple example to get started with WCF still is drawing quite some traffic to this blog, let me pick up on that and show you, how to accomplish the same but much easier with an async communication API. For simplicities sake let me put all...(read more)

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  • Why lock statements don't scale

    - by Alex.Davies
    We are going to have to stop using lock statements one day. Just like we had to stop using goto statements. The problem is similar, they're pretty easy to follow in small programs, but code with locks isn't composable. That means that small pieces of program that work in isolation can't necessarily be put together and work together. Of course actors scale fine :) Why lock statements don't scale as software gets bigger Deadlocks. You have a program with lots of threads picking up lots of locks. You already know that if two of your threads both try to pick up a lock that the other already has, they will deadlock. Your program will come to a grinding halt, and there will be fire and brimstone. "Easy!" you say, "Just make sure all the threads pick up the locks in the same order." Yes, that works. But you've broken composability. Now, to add a new lock to your code, you have to consider all the other locks already in your code and check that they are taken in the right order. Algorithm buffs will have noticed this approach means it takes quadratic time to write a program. That's bad. Why lock statements don't scale as hardware gets bigger Memory bus contention There's another headache, one that most programmers don't usually need to think about, but is going to bite us in a big way in a few years. Locking needs exclusive use of the entire system's memory bus while taking out the lock. That's not too bad for a single or dual-core system, but already for quad-core systems it's a pretty large overhead. Have a look at this blog about the .NET 4 ThreadPool for some numbers and a weird analogy (see the author's comment). Not too bad yet, but I'm scared my 1000 core machine of the future is going to go slower than my machine today! I don't know the answer to this problem yet. Maybe some kind of per-core work queue system with hierarchical work stealing. Definitely hardware support. But what I do know is that using locks specifically prevents any solution to this. We should be abstracting our code away from the details of locks as soon as possible, so we can swap in whatever solution arrives when it does. NAct uses locks at the moment. But my advice is that you code using actors (which do scale well as software gets bigger). And when there's a better way of implementing actors that'll scale well as hardware gets bigger, only NAct needs to work out how to use it, and your program will go fast on it's own.

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  • Effective Business Continuity Planning

    - by Chandra Vennapoosa
    While no one can be sure of where or when a disaster will occur, or what form the disaster will come in, it is important to be prepared for the unexpected. There are many companies today that have not taken into consideration the impact of disasters and this is a grave mistake. BCP Guidelines BCP for Effective Planning Building an Efficient Recovery Solution Plan Recovery Point Objective Hardware and Data Back Up Requirements Evaluation Read here :  Effective Business Continuity Planning

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  • EXT2 on Windows - a Year later

    <b>Matthew Casperson's Hubfolio:</b> "Traditionally the solution is a common partition formatted with FAT32, but instead of making Linux do the hard work of interacting with Windows, I thought I would try it the other way around. This is how I found myself testing both Ext2Fsd and Ext IFS For Windows."

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  • What is the current "standard" for setting up a development environment that supports remote collaboration as well as secure version control?

    - by Andrew
    What is the current "standard" for setting up a development environment that supports remote collaboration as well as secure version control? Considering a virtual dedicated solution with vm for a web layer and a data layer, using VPN for each programmer. We're a small start-up that do both Microsoft and open-source development. Is there a set software tools or packages that are appropriate for a small shop and yet scalable? Thanks.

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  • Microsoft Forefront Endpoint Protection 2010 sort en version RTM avec un nouveau moteur anti-malwares

    Microsoft Forefront Endpoint Protection 2010 sort en version RTM Pour les constructeurs et les revendeurs, elle embarque un nouveau moteur anti-malwares Microsoft vient d'annoncer la disponibilité pour les constructeurs et revendeurs (version RTM) de Forefront Endpoint Security 2010, sa solution d'administration unifiée pour la protection contre les malwares pour les serveurs et les postes de travail des entreprises. En Release Candidate depuis novembre, cette version s'appuie sur « System Center Configuration Manager 2007 », facilitant ainsi le déploiement au niveau des entreprises ayant déjà mis en place des infrastructures de gestion des postes clients de Microsoft. Fore...

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