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• TouchDevelop: The Fast Path to Windows 8 and Phone Apps

  - by Clint Edmonson

  Are you looking for a little extra cash for the upcoming holidays? Then you might be interested in creating some cool apps to sell in the Windows Store. Or maybe you’re simply curious and want to try your hand at developing for Windows 8 and Windows Phone. In either case, the newly released TouchDevelop Web App is for you. TouchDevelop Web App is a development environment to create apps on your tablet or smartphone, without requiring a separate PC. Scripts written by using TouchDevelop can access data, media, and sensors on the phone, tablet, and PC. The script can interact with cloud services, including storage, computing, and social networks. TouchDevelop lets you quickly create fun games and useful tools, turning your scripts into true Windows Phone and Windows 8 apps. A year ago, Microsoft Research released TouchDevelop for Windows Phone, which is being used by enthusiasts, students, and researchers to program their phones in fun, inventive, and interesting ways. These scripts are available at TouchDevelop for anyone to download and use. Ever since we released TouchDevelop, we’ve been eyeing the tablet form factor and working on a version for the browser. Now, with the release of TouchDevelop Web App, the wait is over: the tablet version is ready, so go play around with it. All TouchDevelop scripts that are developed on the smartphone can be downloaded to the tablet and run (if hardware allows). Any script that is developed on the tablet can also be accessed on the phone. And scripts can be converted to Windows Phone or Windows 8 apps and submitted to the Windows Phone Store or Windows Store, respectively. TouchDevelop Web App’s editor and programming language have been designed for tablet devices with touchscreens, but you can also use a keyboard and a mouse. So grab your web-enabled device and give the TouchDevelop Web App a try. It’s fun and easy, and could even put a little cash in your holiday-depleted wallet. Or at least give you bragging rights at family get-togethers. Are you interested in further tips on Windows 8 development?  Sign up for the 30 to launch program which will help you build a Windows Store application in 30 days.  You will receive a tip per day for 30 days, along with potential free design consultations and technical support from a Windows 8 expert. As always, stay tuned to my twitter feed for Windows 8, Windows Azure and other Microsoft announcements, updates, and links: @clinted

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• Software Tuned to Humanity

  - by Phil Factor

  I learned a great deal from a cynical old programmer who once told me that the ideal length of time for a compiler to do its work was the same time it took to roll a cigarette. For development work, this is oh so true. After intently looking at the editing window for an hour or so, it was a relief to look up, stretch, focus the eyes on something else, and roll the possibly-metaphorical cigarette. This was software tuned to humanity. Likewise, a user’s perception of the “ideal” time that an application will take to move from frame to frame, to retrieve information, or to process their input has remained remarkably static for about thirty years, at around 200 ms. Anything else appears, and always has, to be either fast or slow. This could explain why commercial applications, unlike games, simulations and communications, aren’t noticeably faster now than they were when I started programming in the Seventies. Sure, they do a great deal more, but the SLAs that I negotiated in the 1980s for application performance are very similar to what they are nowadays. To prove to myself that this wasn’t just some rose-tinted misperception on my part, I cranked up a Z80-based Jonos CP/M machine (1985) in the roof-space. Within 20 seconds from cold, it had loaded Wordstar and I was ready to write. OK, I got it wrong: some things were faster 30 years ago. Sure, I’d now have had all sorts of animations, wizzy graphics, and other comforting features, but it seems a pity that we have used all that extra CPU and memory to increase the scope of what we develop, and the graphical prettiness, but not to speed the processes needed to complete a business procedure. Never mind the weight, the response time’s great! To achieve 200 ms response times on a Z80, or similar, performance considerations influenced everything one did as a developer. If it meant writing an entire application in assembly code, applying every smart algorithm, and shortcut imaginable to get the application to perform to spec, then so be it. As a result, I’m a dyed-in-the-wool performance freak and find it difficult to change my habits. Conversely, many developers now seem to feel quite differently. While all will acknowledge that performance is important, it’s no longer the virtue is once was, and other factors such as user-experience now take precedence. Am I wrong? If not, then perhaps we need a new school of development technique to rival Agile, dedicated once again to producing applications that smoke the rear wheels rather than pootle elegantly to the shops; that forgo skeuomorphism, cute animation, or architectural elegance in favor of the smell of hot rubber. I struggle to name an application I use that is truly notable for its blistering performance, and would dearly love one to do my everyday work – just as long as it doesn’t go faster than my brain.

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• What Precalculus knowledge is required before learning Discrete Math Computer Science topics?

  - by Ein Doofus

  Below I've listed the chapters from a Precalculus book as well as the author recommended Computer Science chapters from a Discrete Mathematics book. Although these chapters are from two specific books on these subjects I believe the topics are generally the same between any Precalc or Discrete Math book. What Precalculus topics should one know before starting these Discrete Math Computer Science topics?: Discrete Mathematics CS Chapters 1.1 Propositional Logic 1.2 Propositional Equivalences 1.3 Predicates and Quantifiers 1.4 Nested Quantifiers 1.5 Rules of Inference 1.6 Introduction to Proofs 1.7 Proof Methods and Strategy 2.1 Sets 2.2 Set Operations 2.3 Functions 2.4 Sequences and Summations 3.1 Algorithms 3.2 The Growths of Functions 3.3 Complexity of Algorithms 3.4 The Integers and Division 3.5 Primes and Greatest Common Divisors 3.6 Integers and Algorithms 3.8 Matrices 4.1 Mathematical Induction 4.2 Strong Induction and Well-Ordering 4.3 Recursive Definitions and Structural Induction 4.4 Recursive Algorithms 4.5 Program Correctness 5.1 The Basics of Counting 5.2 The Pigeonhole Principle 5.3 Permutations and Combinations 5.6 Generating Permutations and Combinations 6.1 An Introduction to Discrete Probability 6.4 Expected Value and Variance 7.1 Recurrence Relations 7.3 Divide-and-Conquer Algorithms and Recurrence Relations 7.5 Inclusion-Exclusion 8.1 Relations and Their Properties 8.2 n-ary Relations and Their Applications 8.3 Representing Relations 8.5 Equivalence Relations 9.1 Graphs and Graph Models 9.2 Graph Terminology and Special Types of Graphs 9.3 Representing Graphs and Graph Isomorphism 9.4 Connectivity 9.5 Euler and Hamilton Ptahs 10.1 Introduction to Trees 10.2 Application of Trees 10.3 Tree Traversal 11.1 Boolean Functions 11.2 Representing Boolean Functions 11.3 Logic Gates 11.4 Minimization of Circuits 12.1 Language and Grammars 12.2 Finite-State Machines with Output 12.3 Finite-State Machines with No Output 12.4 Language Recognition 12.5 Turing Machines Precalculus Chapters R.1 The Real-Number System R.2 Integer Exponents, Scientific Notation, and Order of Operations R.3 Addition, Subtraction, and Multiplication of Polynomials R.4 Factoring R.5 Rational Expressions R.6 Radical Notation and Rational Exponents R.7 The Basics of Equation Solving 1.1 Functions, Graphs, Graphers 1.2 Linear Functions, Slope, and Applications 1.3 Modeling: Data Analysis, Curve Fitting, and Linear Regression 1.4 More on Functions 1.5 Symmetry and Transformations 1.6 Variation and Applications 1.7 Distance, Midpoints, and Circles 2.1 Zeros of Linear Functions and Models 2.2 The Complex Numbers 2.3 Zeros of Quadratic Functions and Models 2.4 Analyzing Graphs of Quadratic Functions 2.5 Modeling: Data Analysis, Curve Fitting, and Quadratic Regression 2.6 Zeros and More Equation Solving 2.7 Solving Inequalities 3.1 Polynomial Functions and Modeling 3.2 Polynomial Division; The Remainder and Factor Theorems 3.3 Theorems about Zeros of Polynomial Functions 3.4 Rational Functions 3.5 Polynomial and Rational Inequalities 4.1 Composite and Inverse Functions 4.2 Exponential Functions and Graphs 4.3 Logarithmic Functions and Graphs 4.4 Properties of Logarithmic Functions 4.5 Solving Exponential and Logarithmic Equations 4.6 Applications and Models: Growth and Decay 5.1 Systems of Equations in Two Variables 5.2 System of Equations in Three Variables 5.3 Matrices and Systems of Equations 5.4 Matrix Operations 5.5 Inverses of Matrices 5.6 System of Inequalities and Linear Programming 5.7 Partial Fractions 6.1 The Parabola 6.2 The Circle and Ellipse 6.3 The Hyperbola 6.4 Nonlinear Systems of Equations

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• Which JMX statistics to watch out for in Catalina/Tomcat?

  - by geoaxis

  I have configured OpenNMS to collect all kinds of numeric data coming out of tomcat7 jmx. There are a lot of things. I am interested in monitoring this tomcat instance so that I can avoid down time and lockups. What metrics should I be watching out for? I am already monitoring things like CPU, Memory, Network via SNMP. With this JMX connection the things that I find interesting are Catalina:type=GlobalRequestProcessor,name="ajp-bio-/a.b.c.d-XXXX" RequestsCount so far. Catalina:type=Manager,context=/myApp,host=localhost Active sessions and its maximum so far

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• iptables: limiting bytes downloaded per IP per day?

  - by Miles

  On a public-facing web server, I'd like to limit the total bytes downloaded per IP address per day. For example, after a visitor downloaded 100MB, any additional requests would be dropped or rejected for the next 24 hours. Is it possible to accomplish this using iptables alone? The connbytes, connlimit, hashlimit, quota, and recent options all look promising, but the man page plays its cards close to the vest (e.g., "quota - Implements network quotas by decrementing a byte counter with each packet. --quota bytes The quota in bytes."). Would like to avoid using a proxy (like Squid) if possible.

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• Computer froze up

  - by Arlen Beiler

  Why would my computer freeze up out of the blue? I have Apache Webserver w/php, and MySQL server installed. I am not sure exactly when it happened, but I was doing something on a wordpress site that I have installed, and it just waited and waited and waited. Then, all the folders on it that were open on my other computer closed, as though I had disconnected it. Then the skype account went offline. The computer was totally froze. I thought maybe it was someone on logmein, but disconnecting it from the network didn't do anything. I had to "crash" it (held in the power button till it shutdown). It started up normally then and the logs showed absolutely nothing wrong. And doing the same thing that I did when it froze didn't repeat the freeze. Any ideas, I never had this happen before.

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• Need to re-build an application - how?

  - by Tom

  For our main system, we have a small monitor application that sits outside our network and periodically tries to log in to verify the system still works. We have a problem with the monitor though in that the communications component set (Asta 3 inside Delphi applications) doesn't always connect through. Overall, I'd say it's about 95% reliable, but that other 5% kills the monitor since it will try to log in and hang on the connection attempt (no timeout in the component). This really isn't an issue on the client side of the system since the clients don't disconnect and reconnect repeatedly on the same application instance, but I need a way to make sure the monitor stays up and continues working even when the component fails on a run. I have a few ideas as to which way to have the program run, the main idea being to put the communications inside a threaded data module so that if one thread crashes then another thread can test later and the program keep going. Does this sound like a valid way to go? Any other ideas how to ensure a reliable monitoring application with a less than 100% reliable component? Thanks. P.S. Not sure these tags are the most appropriate. Tried including "system-reliability" as one, but not high enough rep to create.

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• DFS replication initial step problem

  - by vn.

  I just setup DFS on my network and it's working fine, and now I'm trying to setup DFS-R on a test folder, but then at the end of the procedure (all went fine, selected my 2 folders, primary folder, replication topology and such) I get this error message (roughly translated from french) : Unable to define security on the replicated folder. The shared administration folder doesn't exist. I'm also wondering if there's any required security on the folders to replicate so that DFS-R can access it. I was trying to add SYSTEM in the security, but it won't find it/allow me. The folder has many many files and folders on the primary DFS pointer, but none on the 2nd, just created it with quite the same rights. Note that the primary DFS pointer is on a 2008 server and the DFS service and the secondary DFS pointer are on a 2008r2. Any help is very appreciated, thanks.

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• ArchBeat Link-o-Rama for 2012-09-18

  - by Bob Rhubart

  Eye on Architecture This week the Oracle Technology Network Solution Architect Homepage features an Oracle Reference Architecture for Software Engineering, a new podcast focusing on why IT governance is important whether you like it or not, and information on the next free OTN Architect Day event. Enabling WebLogic Administrator Group Inside Custom ADF Application | Andrejus Baranovskis A short but informative technical post from Oracle ACE Director Andrejus Baranovkis. Oracle OpenWorld 2012 Hands-on Lab: Leading Your Everyday Application Integration Projects with Enterprise SOA Yet another session to squeeze into your already-jammed Oracle OpenWorld schedule. This hands-on lab focuses on how "Oracle Enterprise Repository, Oracle Application Integration Architecture (AIA) Foundation Pack, and Oracle SOA Suite work together to help you drive your enterprisewide integration projects." Mass Metadata Updates with Folders | Kyle Hatlestad "With the release of WebCenter Content PS5, a new folder architecture called 'Framework Folders' was introduced," explains Fusion Middleware A-Team blogger Kyle Hatlestad. "This is meant to replace the folder architecture of 'Folders_g'. While the concepts of a folder structure and access to those folders through Desktop Integration Suite remain the same, the underlying architecture of the component has been completely rewritten." Creating your first OAM 11g R2 domain | Chris Johnson Prolific Fusion Middleware A-Team Blogger Chris Johnson reads the Oracle Identity and Access Management Installation Guide so you don't have to (though you probably should). Thought for the Day "Each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice." — Christopher Alexander Source: SoftwareQuotes.com

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• Create access point (uap0) on debian 7(arm) - not found?

  - by ethrbunny

  I'm working with a fanless PC that has an ARM chipset, 2 eth plugs and a wifi card (among other things). If I install debian 6 on it all three network interfaces are available at boot time. Today I tried to install debian 7 and had numerous errors indicating that the wireless card isn't supported. uap0: error fetching interface information: Device not found SIOCSIFADDR: No such device uap0: ERROR while getting interface flags: No such device uap0: ERROR while getting interface flags: No such device No such device ERR:UAPHOSTCMD is not supported by uap0 ERR:Command sending failed! No such device ERR:UAPHOSTCMD is not supported by uap0 ERR:Command sending failed! I've tried comparing the kernel module list to the working system but there are too many other differences to make something obvious enough (to me) stand out. How would I get started debugging this problem?

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• MSTSC Not working, disconnects shortly after connecting

  - by F4r-20

  I'm currently having a problem connecting remotely to a server. It is a brand new build Windows 2008 R2, remote users are enabled. I'm trying to connect from a Windows 7 machine. Everytime I remotely connect to the server it will stay connected for a matter of seconds (maybe 3-5) and then disconnect and I get the standard old cannot connect and list of reasons it could be. Then I cannot connect again and get this prompt until I restart the server. As soon as it's finished restarting, it happens all over again. The network and hardware configuration between the two machines is completely reliable. Does anybody know what else I could try? Thanks.

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• It's Here! Visual Studio 2010 and ASP.NET 4.0 Ship

  Today Microsoft released Visual Studio 2010 and ASP.NET 4.0. I've been using the RC version of Visual Studio 2010 quite a bit for the past couple of months and have really grown to like it. It has a host of features and enhancements that improve developer productivity, from improved IntelliSense to better multiple monitor support. Plus there's something about the user experience that, to me, makes it feel better than Visual Studio 2008. I don't know if it's the new blue color motif or what, but the IDE seems more modern looking and more responsive to my mouse movements and other input. Anyway, if you've not yet downloaded Visual Studio 2010 and ASP.NET 4.0, why not? As with previous versions of Visual Studio there's a free Express Edition and VS2010 and ASP.NET 4.0 runs side-by-side with earlier versions of Visual Studio and ASP.NET. And with Visual Studio 2010's multi-targeting you can even use VS2010 as your development editor for ASP.NET 2.0 and ASP.NET 3.5 web applications. (Although be forewarned if you have multiple developers working on the application that the project files in VS2010 and earlier versions of Visual Studio differ.) This week's article on 4Guys explores my favorite new features of Visual Studio 2010. Here's an excerpt: The Visual Studio 2010 user experience is noticeably different than with previous versions. Some of the changes are cosmetic - gone is the decades-old red and orange color scheme, having been replaced with blues and purples - while others are more substantial. For instance, the Visual Studio 2010 shell was rewritten from the ground up to use Microsoft's Windows Presentation Foundation (WPF). In addition to an updated user experience, Visual Studio introduces an array of new features designed to improve developer productivity. There are new tools for searching for files, types, and class members; it's now easier than ever to use IntelliSense; the Toolbox can be searched using the keyboard; and you can use a single editor - Visual Studio 2010 - to work on. This article explores some of the new features in Visual Studio 2010. It is not meant to be an exhaustive list, but rather highlights those features that I, as an ASP.NET developer, find most useful in my line of work. Read on to learn more! And, in closing, here are some helpful VS2010 and ASP.NET 4.0 links: One click installation for ASP.NET 4.0, Visual Web Developer 2010, .NET Framework 4.0, and ASP.NET MVC 2 Eight Quick Hit videos showing some of the cool new VS2010 features VS2010 and ASP.NET 4.0 Release Announcement with some great info/links from none other than Scott Guthrie Happy Programming!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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• How long can you be out of the MS market before it affects your career [closed]

  - by dave

  I've been working with .Net since it first came out and have done my best to use the latest and greatest things from Redmond. That being said, I've been working for the past year in the Python/Unix/Web world. In order to keep myself relevant in the MS world, I've been working part-time on a WPF project but I do not know how much longer that work will continue. So my question is: If I were to move totally to the Unix/Python/Web world, how long could I stay there before it starts getting hard to get another MS job? I am trying not to burn bridges in my career as I've found MS jobs pay better and tend to be more plentiful. PS: I like my Python job since it is something new and I get to work from home. It has provided a different view on coding that I've found useful. EDIT: I was out of the MS market for 12 months before attempting to get another MS job. No-one said "Gee you've been gone a while" but I did get a conspicuous lack of responses to job applications. My feeling is that the head-hunters do not bother to look beyond your last job. In the end, I got employment via my own network rather than the pimps. So, to answer my question: "not long, especially if you trust your career to head hunters."

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• Web browsing is fast, but downloads are slow

  - by Ricket

  I work for a company on my university's campus, helping with general IT problems and some web development. But lately there has been a problem that has me and my boss completely stumped. We, plus one contractor, make up the entire IT department, so I'm reaching out to you for help. All around the office, we have wall jacks. These collect in a closet down the hall and all plug into a switch. This switch, along with our individual server jacks, plugs into another switch, and that switch plugs into our firewall hardware. Then the firewall is connected out to our campus network. Our campus internet is, well, very fast. I don't know exactly the terms, tiers, etc., but we have thousands of students and downloads can run as fast as 10 MB/s at night; uploads are sometimes even faster. I think we're practically ISP level. In short, I have a lot of faith that it is not the campus side of things that is causing a problem, combined with other evidence I'll mention in a moment. So our symptoms: web browsing is fast. Web pages, images, etc. load instantly. No problems there. But then when I go to download something, the download starts fast but very quickly (a matter of seconds) drops to nearly 0. Often it will actually drop to 0 and time out. This happens with even very small files, 1 MB or less. It smells to me like a QoS sort of thing. I'm not entirely sure, and I wanted to get your opinions first. My boss is hesitant to touch our firewall, much less let me touch it, and it was set up and is managed by a consultant remotely. These problems don't seem tied to a time of the day. I've tried downloads after 5:00 and still the same thing happens. From my desk, I can turn on my wireless adapter and pick up the campus wireless access point. If I unplug ethernet and connect to it, downloads are fast. This adds to my suspicion that it's limited to our company network. Also, a number of weeks ago the consultant upgraded our firewall firmware. Suddenly everything was very fast. I tested with downloads from Sun and speedtest.net and things were blazing fast, as they should be with our campus internet! It was wonderful, and I figured the slow speeds were an old firmware bug. In a matter of days, things steadily declined until they were back to the old symptoms. Oh, and we have antivirus installed on every computer, and we keep it up to date. Though I suppose the possibility is still there that someone could have spyware which is bogging down our internet, in which case what is the easiest/best way to find this out? (maybe this should go in a separate question) Thank you for your patience in reading all of this. Do you have any ideas as to what I can try? Is this something that you've experienced before? What sort of tools or methods can I use to try and diagnose the problem? P.S. everything here is Windows. Windows Server 2003 and 2008 on our servers, and Windows XP on employees' machines. Update: We are submitting a ticket to the university to just take a look and see if they see anything unusual and/or can suggestion methods for us to try and pinpoint our problem. Hopefully they'll be helpful! I'll update this to let you know what goes on. Update again: We found a hub (yes, a HUB) right between our campus connection and our firewall. It had only those two ethernet cables plugged into it, nothing else. After removing the hub, our speeds have jumped up to several mbps. However in talking with the campus, we got them to run a gigabit line to our firewall in place of the 100mbps line. As of friday, we are at about 65 mbps up and down (according to speedtest.net at 8am)!! Go NC State!!

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• Exchange 2010 - Trying to add an additional domain fails

  - by Tom Beech

  We're trying to add an additional domain to our existing exchange 2010 box. I'm doing this under our network administrator user which has pretty much every permission but i'm getting: VERBOSE: Connecting to EXCHANGE01.isd.isdevelopment.co.uk VERBOSE: Connected to EXCHANGE01.isd.isdevelopment.co.uk. [PS] C:\Windows\system32>new-AcceptedDomain -Name 'NewName' -DomainName 'newDomainaddress.com' -DomainType 'Autho ritative' Active Directory operation failed on DCSERVER01.isd.isdevelopment.co.uk. This error is not retriable. Additional inform ation: Insufficient access rights to perform the operation. Active directory response: 00002098: SecErr: DSID-03150BB9, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0 + CategoryInfo : NotSpecified: (0:Int32) [New-AcceptedDomain], ADOperationException + FullyQualifiedErrorId : 282695C2,Microsoft.Exchange.Management.SystemConfigurationTasks.NewAcceptedDomain Any help will be appreciated. Tom

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• JavaOne Latin America 2011: Keynotes, Sessions, Hands-on Lab, Geek Bike Ride, etc.

  - by arungupta

  After a very successful JavaOne San Francisco, the first JavaOne on the road for 2011 is heading to Latin America next week. There are 59 sessions delivered by several rock star speakers and with 60% sessions delivered by the local community. There are strategy, technical and community keynotes. The community keynote on Thursday will particularly be lot of fun with appearances from Java Champions, JUG leaders, jHome, and several others. Also check out the Exhibitor Floor Plan and don't forget to Register! The complete session schedule gives an overview for the list of technical sessions and hands-on lab. There are several Java EE, GlassFish, and WebLogic sessions and are highlighted below: Tuesday, Dec 6 Oracle WebLogic Server XML-Free Programming: Java Server and Client Development without <> Java EE Application in Production: Tips and Tricks to achieve zero downtime Web Applications and Wicket Scala on GlassFish and Java EE 6 REST and Java best practices, issues and solutions for the Enterprise Building a RESTful Web Application with JAX-RS and Ext JS 4 Wednesday, Dec 7 Oracle GlassFish Server in the Virtual World JAX-RS 2.0: What's in JSR 339 ? JSF 343: What's coming in Java Message Service 2.0 ? The Great News of JSF 2.0! Thursday, Dec 8 Servlet 3.1 Update Develop, Deploy, and Monitor a Java EE 6 Application with Clustered GlassFish 3.1 Migrating from EJB/SOAP to REST with JAX-RS: The Case of the Central Bank of Brazil GlassFish REST Administration Back End: An Insider look at a real REST Application Scripting and Agile Java EE Applications with Jython And this is Brazil so a fun element is important. There are the usual Caiprihinas, Churrascaria, late night social dinners, community engagement, and multiple other fun activities. Fabiane Nardon and SOUJava gang are also organizing a Geek Bike Ride on the Sunday (Dec 4th) before JavaOne. The 20k ride (map) starts at 7am and goes through the streets of Sao Paulo. This is an opportunity to meet some of the JavaOne speakers and attendees outside the conference. They've even designed a t-shirt and 32 geeks have signed up so far. I'm glad my discussion with Fabiane during FISL early this year for arranging this bike ride is finally taking shape! I'm definitely looking forward to it and will be bringing nice fruity Odwalla bars for all the riders. Be there to ride with me and many others :-) Stay updated by following @oracledobrasil and @javaoneconf. I'll be there, will you ? Don't wait and register now! And in case you are interested in reading about the experience from last year ... it was lot of fun! Just check out a collage of pictures yourself ... And the complete album at:

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• ConsumeStructuredBuffer, what am I doing wrong?

  - by John

  I'm trying to implement the 3rd exercise in chapter 12 of Introduction to 3D Game Programming with DirectX 11, that is: Implement a Compute Shader to calculate the length of 64 vectors. Previous exercises ask you to do the same with typed buffers and regular structured buffers and I had no problems with them. For what I've read, [Consume|Append]StructuredBuffers are bound to the pipeline using UnorderedAccessViews (as long as they use the D3D11_BUFFER_UAV_FLAG_APPEND, and the buffers have both D3D11_BIND_SHADER_RESOURCE and D3D11_BIND_UNORDERED_ACCESS bind flags). Problem is: my AppendStructuredBuffer works, since I can append data to it and retrieve it from the application to write to a results file, but the ConsumeStructuredBuffer always returns zeroed data. Data is in the buffer, since if I change the UAV to a ShaderResourceView and to a StructuredBuffer in the HLSL side it works. I don't know what I am missing: Should I initialize the ConsumeStructuredBuffer on the GPU, or can I do it when I create the buffer (as I amb currently doing). Is it OK to bind the buffer with a UAV as described above? Do I need to bind it as a ShaderResourceView somehow? Maybe I am missing some step? This is the declaration of buffers in the Compute Shader: struct Data { float3 v; }; struct Result { float l; }; ConsumeStructuredBuffer<Data> gInput; AppendStructuredBuffer<Result> gOutput; And here the creation of the buffer and UAV for input data: D3D11_BUFFER_DESC inputDesc; inputDesc.Usage = D3D11_USAGE_DEFAULT; inputDesc.ByteWidth = sizeof(Data) * mNumElements; inputDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_UNORDERED_ACCESS; inputDesc.CPUAccessFlags = 0; inputDesc.StructureByteStride = sizeof(Data); inputDesc.MiscFlags = D3D11_RESOURCE_MISC_BUFFER_STRUCTURED; D3D11_SUBRESOURCE_DATA vinitData; vinitData.pSysMem = &data[0]; HR(md3dDevice->CreateBuffer(&inputDesc, &vinitData, &mInputBuffer)); D3D11_UNORDERED_ACCESS_VIEW_DESC uavDesc; uavDesc.Format = DXGI_FORMAT_UNKNOWN; uavDesc.ViewDimension = D3D11_UAV_DIMENSION_BUFFER; uavDesc.Buffer.FirstElement = 0; uavDesc.Buffer.Flags = D3D11_BUFFER_UAV_FLAG_APPEND; uavDesc.Buffer.NumElements = mNumElements; md3dDevice->CreateUnorderedAccessView(mInputBuffer, &uavDesc, &mInputUAV); Initial data is an array of Data structs, which contain a XMFLOAT3 with random data. I bind the UAV to the shader using the Effects framework: ID3DX11EffectUnorderedAccessViewVariable* Input = mFX->GetVariableByName("gInput")->AsUnorderedAccessView(); Input->SetUnorderedAccessView(uav); // uav is mInputUAV Any ideas? Thank you.

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• EC2 server in VPC stops responding joining domain

  - by Geoff

  We have a EC2 Windows Server set up and running in our VPC, connected to our network via a Juniper 5GT. This is working well, with the tunnel up and stable. If I then join the server to our local domain, it appears to work - I can then log on using domain credentials, and use domain accounts when applying security to folders etc. After I log out, if I give it around an hour, the box becomes unresponsive. I can't ping it, although a tracert goes all the way barring the last hop - so the tunnel is ok. I can't RDP into it. If I reboot it, then it works for a while before doing the same thing. Un-joining it from the domain fixes the problem, and it stays up and stable. The event logs don't show anything obvious, at least to me. Any ideas?

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• Metro Apps on Windows 8 aren't working with static IP behind auth proxy

  - by Kamal

  In Windows 8 Professional, Metro Apps and Windows Update do not work with static IP settings behind authenticated proxy server. They work with DHCP on the same proxy settings (we have DHCP for wifi and static IP for LAN, both using the same proxy server). IE, Chrome and other desktop apps work nicely with both. Metro apps worked with an auth proxy (DHCP only), when I changed their proxy settings from the "edit group policy" option: Start → Settings → Edit Group Policy → Computer Configuration → Administrative Templates → Network Isolation → Internet Proxy for Apps How can I fix this?

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• Slow Web Performance on two Windows 2008 R2 Terminal Servers

  - by Frank Owen

  We have two Windows 2008 R2 servers that we use for agents to log into to access our customers systems. Saturday morning we received complaints that on both servers the web is running horribly slow. This happens on all websites and the majority of the time the web site times out trying to load. Other users located at the same site but using their desktop machine do not see any issue. We have rebooted the boxes and checked settings and cannot find the cause. The CPU/Memory/Network/Disk Space use on the server is very low. I thought it might have been a MS update causing the issue but it appears the last update was applied in January. We have rebooted both boxes and I am in process of trying a different browser. Any ideas what could be causing this?

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• Why do my proxy settings keep changing?

  - by tjrobinson

  I am running Windows 7 and a few times a day the "Use a proxy server for your LAN (These settings will not apply to dial-up of VPN connections)." under "Local Area Network (LAN) Settings" checkbox becomes checked seemingly on it's own. Am I pressing some kind of hidden keyboard shortcut accidentally? What sort of applications might alter this setting and why? Unfortunately as this is a developer box, there's a lot of stuff that could be interfering, e.g. Visual Studio 2010, Windows Azure SDK and various browsers. Has anyone else come across this?

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• Cannot access any remote resource after connecting to Cisco VPN on Vista

  - by Deepak Singh Rawat

  I have installed Cisco vpn client version 5.0.07.0290 on Vista Business SP2. I am able to successfully connnect to the vpn. But after connecting I am not able to access any resource in the vpn (like database, other computers in the network etc.). I have tried the following without any success : Older versions of the client Other vpn clients like Shrewsoft : same issue as the cisco vpn client Disabled Internet Connection Sharing service Installed the client in the root administrator account Run the installer as administrator Run the vpngui and ipsecdialer in XP compatibility mode and as administrator I am not sure how to troubleshoot this issue. Can somebody please help me in troubleshooting this issue? P.S : I've Zonealarm firewall, can that be an issue?

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• Creating, using and managing XML component dictionaries quick tutorials

  - by drrwebber

  XML Component Dictionary capabilities are provided in conjunction with the CAM Editor toolset.  These dictionaries accelerate the development of consistent XML information exchanges using standard sets of dictionary components. The quick tutorials are aimed at showing the 'how to' of the basic capabilities to jump start use of XML dictionaries with the CAM Editor. The collection of dictionary tutorials videos run for a total of approximately 20 minutes.  Each video can be reviewed individually also. Learn how to use the dictionary functions to create dictionaries by harvesting data model components from existing XSD schema, SQL database table schema, or simple Excel / Open Office spreadsheets with tables of components listed.Also included are tips and functions relating to use of NIEM exchange development, IEPD and EIEM techniques.These videos should be viewed in conjunction with reviewing the overall concepts and techniques described in the companion video on the CAM Editor and Dictionaries overview.  The approach is aligned with OASIS and Core Components Technical Specification (CCTS) standards specifications for XML components and dictionaries.Dictionary collections can be stored locally on the file system, or local network, or collaboratively on the web or cloud deployment, or can be shared and managed securely using the Oracle Enterprise Repository (OER) tool. Also included are techniques relating to the use of the NIEM approach for developing XML exchange schema and IEPD packages.  This includes generating reuse scores, wantlist, and cross reference spreadsheets. Included in the latest release of the CAM Editor is the ability to use the analyse dictionary tool to determine duplicate components, conflicting component definitions, missing component descriptions and so on.  This ensures high quality dictionary component specifications.  Using the CAM Editor you can also create MindMap models and UML physical models of your dictionary components sets. For a complete guide to using the CAM Editor see the main YouTube video tutorials website and the CAM Editor website.

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• NFS share access - Permission denied

  - by rgngl

  I'm trying to share a directory on my NAS device(WD Mybook WE) with NFS to another machine on my local network. The directory on the NAS device looks like this: drwxr-x--- 15 git git 4096 Nov 17 01:05 git/ And id's of the user git on the NAS device is like this: [root@myhost DataVolume]# id git uid=505(git) gid=505(git) I played with many different parameters in the /etc/exports file and this is what I got there currently: /DataVolume/git 192.168.0.20(async,rw,no_root_squash,no_subtree_check) On the client side I have the user git and group git with the same id's to match the ones on the server. user@myclient:~$ id git uid=505(git) gid=505(git) groups=505(git) I mount the directory with: sudo mount myhost:/DataVolume/git -t nfs git/ and the mounted directory looks like: drwxr-x--- 15 git git 4096 Nov 17 01:05 git After these steps I can't seem to cd to that directory with any user, including git and root. I am getting a Permission denied error. Thanks in advance for any help.

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• Diagnosing Bootstrap 3 Glyphicon Button Icons Not Showing

  - by Paulb

  I have a glyphicons in Bootstrap 3. They work very nicely here: latest Chrome latest Firefox latest Safari latest Explorer latest Android At one facility, the glyphicons don't show. The buttons come up blank. How do I troubleshoot? They are security sensitive there. I don't have systems or network access.. and am not in a position to request that. Troubleshooting with advanced tools isn't going to happen. Here's what I have access to: Internet Explorer 9 Behind a very secure firewall Sometimes, I think the glyphs not showing is the IE 9.. but my code should be addressing that. Sometimes, I think their firewall is blocking the CDN. Can I enter a URL into a browser to test if the CDN is there? Sometimes, I think my FB share and like buttons upset this facilty's firewall, and they tie the whole thing down. Any suggestions at how I begin to research this? Or maybe you have an outright idea for IE 9 and glyphs (though my code is very-very close to the demo's which work).

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