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• Heading to GTC 2010

  - by Daniel Moth

  Next week the GPU Technology Conference (GTC) 2010 takes place in San Jose, CA and I am lucky enough to be attending the entire week. It has been an extremely long time (in fact, I can't remember the last time) where I am registered as an attendee at a conference (full pass/access) without being a speaker *and* without having any booth duty! Having said that, we (our team at Microsoft) will be running GPU debugging UX studies throughout the entire week (similar to what I had previously advertised). If you are attending GTC 2010 and you are interested, look for the related flyer in your conference bag. The conference is an excellent opportunity to connect in-person with various individuals that I have only met virtually. From an educational perspective there is a very long and interesting session list, with multiple concurrent slots, making it very hard to choose between them, but I have managed to create my (packed) schedule. I am most looking forward to sessions on the programming languages and tools, both from Microsoft and MS partners. For full conference details, visit the GTC 2010 official page. Comments about this post welcome at the original blog.

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• Speaking at AMD Fusion conference

  - by Daniel Moth

  Next Wednesday at 2pm I will be presenting a session at the AMD Fusion developer summit in Bellevue, Washington State. For more on this conference please visit the official website. If you filter the catalog by 'Speaker Last Name' to "Moth", you'll find my talk. For your convenience, below is the title and abstract Blazing-fast code using GPUs and more, with Microsoft Visual C++ To get full performance out of mainstream hardware, high-performance code needs to harness, not only multi-core CPUs, but also GPUs (whether discrete cards or integrated in the processor) and other compute accelerators to achieve orders-of-magnitude speed-up for data parallel algorithms. How can you as a C++ developer fully utilize all that heterogeneous hardware from your Visual Studio environment? How can your code benefit from this tremendous performance boost without sacrificing your developer productivity or the portability of your solution? The answers will be presented in this session that introduces a new technology from Microsoft. Hope to see many of you there! Comments about this post welcome at the original blog.

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• C++ Accelerated Massive Parallelism

  - by Daniel Moth

  At AMD's Fusion conference Herb Sutter announced in his keynote session a technology that our team has been working on that we call C++ Accelerated Massive Parallelism (C++ AMP) and during the keynote I showed a brief demo of an app built with our technology. After the keynote, I go deeper into the technology in my breakout session. If you read both those abstracts, you'll get some information about what C++ AMP is, without being too explicit since we published the abstracts before the technology was announced. You can find the official online announcement at Soma's blog post. Here, I just wanted to capture the key points about C++ AMP that can serve as an introduction and an FAQ. So, in no particular order… C++ AMP lowers the barrier to entry for heterogeneous hardware programmability and brings performance to the mainstream, without sacrificing developer productivity or solution portability. is designed not only to help you address today's massively parallel hardware (i.e. GPUs and APUs), but it also future proofs your code investments with a forward looking design. is part of Visual C++. You don't need to use a different compiler or learn different syntax. is modern C++. Not C or some other derivative. is integrated and supported fully in Visual Studio vNext. Editing, building, debugging, profiling and all the other goodness of Visual Studio work well with C++ AMP. provides an STL-like library as part of the existing concurrency namespace and delivered in the new amp.h header file. makes it extremely easy to work with large multi-dimensional data on heterogeneous hardware; in a manner that exposes parallelization. introduces only one core C++ language extension. builds on DirectX (and DirectCompute in particular) which offers a great hardware abstraction layer that is ubiquitous and reliable. The architecture is such, that this point can be thought of as an implementation detail that does not surface to the API layer. Stay tuned on my blog for more over the coming months where I will switch from just talking about C++ AMP to showing you how to use the API with code examples… Comments about this post welcome at the original blog.

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• Join our team at Microsoft

  - by Daniel Moth

  If you are looking for a SDE or SDET job at Microsoft, keep on reading. Back in January I posted a Dev Lead opening on our team, which was quickly filled internally (by Maria Blees). Our team is part of the recently announced Microsoft Technical Computing group. Specifically, we are working on new debugger functionality, integrated with Visual Studio (we are starting work on the next version), aimed to address HPC and GPGPU scenarios (and continuing the Parallel Debugging scenarios we started addressing with VS2010). We now have many more openings on our debugger team. We posted three of those on the careers website: Software Development Engineer Software Development Engineer II Software Development Engineer in Test II (don't let the word "Test" fool you: An SDET on our team is no different than a developer in any way, including the skills required) Please do read the contents of the links above. Specifically, note that for both positions you need to be as proficient in writing C++ code as you are with managed code (WPF experience is a plus). If you think you have what it takes, you wish to join a quality and schedule driven project, and want to contribute features to a product that has global impact, then send me your resume and I'll pass it on to the hiring managers. Comments about this post welcome at the original blog.

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• User eXperience

  - by Daniel Moth

  The last few months I have been spending a lot of time designing (and help design) the developer experience for the areas I contribute to (in future versions of Visual Studio). As a technical person who defines feature sets, it is easy to get engulfed in the pure technical side of things and ignore the details that ultimately make users "love" using the product to achieve their goal, instead of just "having to use" it. Engaging in UX design helps me escape that trap. In case you are also interested in the UX side of development, I thought I'd share an interesting site I came across: UX myths. In particular, I recommend reading myths 9, 10, 12, 13, 14, 15 and 21. Let me know if there are other UX resources you recommend… Comments about this post welcome at the original blog.

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• "Hello World" in C++ AMP

  - by Daniel Moth

  Some say that the equivalent of "hello world" code in the data parallel world is matrix multiplication :) Below is the before C++ AMP and after C++ AMP code. For more on what it all means, watch the recording of my C++ AMP introduction (the example below is part of the session). void MatrixMultiply(vector<float>& vC, const vector<float>& vA, const vector<float>& vB, int M, int N, int W ) { for (int y = 0; y < M; y++) { for (int x = 0; x < N; x++) { float sum = 0; for(int i = 0; i < W; i++) { sum += vA[y * W + i] * vB[i * N + x]; } vC[y * N + x] = sum; } } } Change the function to use C++ AMP and hence offload the computation to the GPU, and now the calling code (which I am not showing) needs no changes and the overall operation gives you really nice speed up for large datasets…  #include <amp.h> using namespace concurrency; void MatrixMultiply(vector<float>& vC, const vector<float>& vA, const vector<float>& vB, int M, int N, int W ) { array_view<const float,2> a(M, W, vA); array_view<const float,2> b(W, N, vB); array_view<writeonly<float>,2> c(M, N, vC); parallel_for_each( c.grid, [=](index<2> idx) mutable restrict(direct3d) { float sum = 0; for(int i = 0; i < a.x; i++) { sum += a(idx.y, i) * b(i, idx.x); } c[idx] = sum; } ); } Again, you can understand the elements above, by using my C++ AMP presentation slides and recording… Stay tuned for more… Comments about this post welcome at the original blog.

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• C++ AMP recording and slides

  - by Daniel Moth

  Yesterday we announced C++ Accelerated Massive Parallelism. Many of you want to know more about the API instead of just meta information. I will trickle more code over the coming months leading up to the date when we will share actual bits. Until you have bits in your hand, it is only your curiosity that is blocked, so I ask you to be patient with that and allow me to release this on our own schedule ;-) You can now watch my 45-minute session introducing C++ AMP on channel9. You will also want to download the slides (pdf), because they are not readable in the recording. Comments about this post welcome at the original blog.

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• How to hide items under the options from one select box upon selection of an item in another select

  - by jl

  Hi, I am new to jQuery and would like to know how is it possible for me to hide an option in a selection box based on the selection of another selection box. I have 5 selection boxes, this is for the administrator to select the users of a limited criteria. The <options> are create dynamically from the results of a database query and php, and they all have the same <options>. e.g. this is an example of the selection boxes with their option values. userbox1 - Amy, Bosh, Cathy, Daniel, Ethan userbox2 - Amy, Bosh, Cathy, Daniel, Ethan userbox3 - Amy, Bosh, Cathy, Daniel, Ethan userbox4 - Amy, Bosh, Cathy, Daniel, Ethan userbox5 - Amy, Bosh, Cathy, Daniel, Ethan So if the administrator selects Cathy in userbox1, Cathy will be automatically be hidden from the selection on the rest of the userbox. And if the administrator changes his/her mind and reselect another user call Ethan. The userboxes should be able to show the availability of Cathy in the selection. I am not sure is hide/show the correct status to be used in such cases. May I know how is it possible to write the function as stated above? If I am missing some current references, kindly point me to it. Thanks in advance.

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• Problem with RVM and gem that has an executable

  - by djhworld

  Hi there, I've recently made the plunge to use RVM on Ubuntu. Everything seems to have gone swimmingly...except for one thing. I'm in the process of developing a gem of mine that has a script placed within its own bin/ directory, all of the gemspec and things were generated by Jeweler. The bin/mygem file contains the following code: - #!/usr/bin/env ruby begin require 'mygem' rescue LoadError require 'rubygems' require 'mygem' end app = MyGem::Application.new app.run That was working fine on the system version of Ruby. Now...recently I've moved to RVM to manage my ruby versions a bit better, except now my gem doesn't appear to be working. Firstly I do this: - rvm 1.9.2 Then I do this: - rvm 1.9.2 gem install mygem Which installs fine, except...when I try to run the command for mygem mygem I just get the following exception: - daniel@daniel-VirtualBox:~$ mygem <internal:lib/rubygems/custom_require>:29:in `require': no such file to load -- mygem (LoadError) from <internal:lib/rubygems/custom_require>:29:in `require' from /home/daniel/.rvm/gems/ruby-1.9.2-p136/gems/mygem-0.1.4/bin/mygem:2:in `<top (required)>' from /home/daniel/.rvm/gems/ruby-1.9.2-p136/bin/mygem:19:in `load' from /home/daniel/.rvm/gems/ruby-1.9.2-p136/bin/mygem:19:in `<main>'mygem NOTE: I have a similar RVM setup on MAC OSX and my gem works fine there so I think this might be something to do with Ubuntu?

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• Improving the state of the art in API documentation sites

  - by Daniel Cazzulino

  Go straight to the site if you want: http://nudoq.org. You can then come back and continue reading :) Compare some of the most popular NuGet packages API documentation sites: Json.NET EntityFramework NLog Autofac You see the pattern? Huge navigation tree views, static content with no comments/community content, very hard (if not impossible) to search/filter, etc. These are the product of automated tools that have been developed years ago, in a time where CHM help files were common and even expected from libraries. Nowadays, most of the top packages in NuGet.org don’t even provide an online documentation site at all: it’s such a hassle for such a crappy user experience in the end! Good news is that it doesn’t have to be that way. Introducing NuDoq A lot has changed since those early days of .NET. We now have NuGet packages and the awesome channel that is ...Read full article

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• How to tweet automatically when you push a new package to nuget.org

  - by Daniel Cazzulino

  Wouldn’t it be nice if your followers could be notified whenever you publish a new version of a NuGet package? Currently, nuget.org offers no support for this, but with the following tricks, you can get it working without programming. The essential idea is to use the OData feed that nuget.org exposes to build an RSS feed with new items as you publish them, and have IFTTT do the tweeting from it. The tools we’ll use to get this working are: LinqPad: to examine the nuget.org OData feed at https://nuget.org/api/v2  Yahoo Pipes: to tweak the OData feed output so that it looks like a “plain” feed IFTTT: to consume the pipe output and auto-tweet on new items   Exploring NuGet OData Feed with LinqPad In order to build the query that will become your tweets’ source, we will add a new connection in LinqPad by clicking on the “Add Connection” link:...Read full article

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• Simplified INotifyPropertyChanged Implementation with WeakReference Support and Typed Property Acces

  - by Daniel Cazzulino

  I've grown a bit tired of implementing INotifyPropertyChanged. I've tried ways to improve it before (like this "ViewModel" custom tool which even generates strong-typed event accessors). But my fellow Clarius teammate Mariano thought it was overkill and didn't like that tool much. He mentioned an alternative approach also, which I didn't like too much because it relied on the consumer changing his typical interaction with the object events, but also because it has a substantial design flaw that causes handlers not to be called at all after a garbage collection happens. A very simple unit test will showcase this bug....Read full article

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• How To Temporarily Disable The Touch Screen In X1 Carbon

  - by Daniel Cazzulino

  I know, why would anyone want to do that? Scott properly predicted: Don't knock a touchscreen until you've used one. Every laptop should (and will) have a touch screen in a year. Mark my words. And surely, less than a year later, the X1 Carbon (an amazing ultrabook for sure) has a touch model. And as of today, the price difference for the touch screen is a ridiculous $30 (actually $24 with a “back to school” coupon right now ;)): So why would you NOT get it? I know for some it works great. Now, let’s get real about touch *for a developer* for a minute. About 99.9% of my time in front of my laptop I’m either using Visual Studio or Chrome. I have my hands on the keyboard ALL THE TIME. I use the trackpoint ALL THE TIME. If I want to scroll, I only have to slightly move my fingers. I don’t click around much on pages: I READ them. So, in a few months of using the X1, I think I touched the screen like 10 times, and it was mostly to clear dust, which drives whatever app is in focus crazy. Plus, at home I have this simple setup:...Read full article

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• How to merge your referenced assemblies into the output assembly for improved usability

  - by Daniel Cazzulino

  Something we've been doing in moq since the very beginning is to have a single assembly as output: Moq.dll. This reduces the clutter for users and lets them focus on what they need from our library, rather than getting the noise of whatever third-party (or internal) libraries we use to implement it. This is good from the deployment point of view too, and if all your libraries are actually internal infrastructure assemblies, you can even make them all internal types of your output assembly....Read full article

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• How to perform regular expression based replacements on files with MSBuild

  - by Daniel Cazzulino

  And without a custom DLL with a task, too . The example at the bottom of the MSDN page on MSBuild Inline Tasks already provides pretty much all you need for that with a TokenReplace task that receives a file path, a token and a replacement and uses string.Replace with that. Similar in spirit but way more useful in its implementation is the RegexTransform in NuGet’s Build.tasks. It’s much better not only because it supports full regular expressions, but also because it receives items, which makes it very amenable to batching (applying the transforms to multiple items). You can read about how to use it for updating assemblies with a version number, for example. I recently had a need to also supply RegexOptions to the task so I extended the metadata and a little bit of the inline task so that it can parse the optional flags. So when using the task, I can pass the flags as item metadata as follows:...Read full article

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• Crazy Linq: performing System.ComponentModel.DataAnnotations validation in a single statement

  - by Daniel Cazzulino

  public static IEnumerable&lt;ValidationResult&gt; Validate(object component) { return from descriptor in TypeDescriptor.GetProperties(component).Cast&lt;PropertyDescriptor&gt;() from validation in descriptor.Attributes.OfType&lt;System.ComponentModel.DataAnnotations.ValidationAttribute&gt;() where !validation.IsValid(descriptor.GetValue(component)) select new ValidationResult( validation.ErrorMessage ?? string.Format(CultureInfo.CurrentUICulture, "{0} validation failed.", validation.GetType().Name), new[] { descriptor.Name }); } ...Read full article

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• WCF Data Service Pipeline

  - by Daniel Cazzulino

  For documentation purposes, I just draw the following UML sequence diagrams for the “Astoria” pipeline, using Visual Studio 2010 Ultimate: For a single-entity (or non-batched) request, this is the sequence: For a batch request, this is the sequence instead: DataService component is your own DataService<T>-derived class, and DataService.ProcessingPipeline refers to its ProcessingPipeline property pipeline events.   /kzu

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• Check your Embed Interop Types flag when doing Visual Studio extensibility work

  - by Daniel Cazzulino

  In case you didn’t notice, VS2010 adds a new property to assembly references in the properties window: Embed Interop Types: This property was introduced as a way to overcome the pain of deploying Primary Interop Assemblies. Read that blog post, it will help understand why you DON’T need it when doing VS extensibility (VSX) work. It's generally advisable when doing VSX development NOT to use Embed Interop Types, which is a feature intended mostly for office PIA scenarios where the PIA assemblies are HUGE and had to be shipped with your app. This is NEVER the case with VSX authoring. All interop assemblies you reference (EnvDTE, VS.Shell, etc.) are ALWAYS already there in the users' machine, and you NEVER need to distribute them. So embedding those types only increases your assembly size without a single benefit to you (the extension developer/author).... Read full article

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• A really simple ViewModel base class with strongly-typed INotifyPropertyChanged

  - by Daniel Cazzulino

  I have already written about other alternative ways of implementing INotifyPropertyChanged, as well as augment your view models with a bit of automatic code generation for the same purpose. But for some co-workers, either one seemed a bit too much :o). So, back on the drawing board, we came up with the following view model authoring experience:public class MyViewModel : ViewModel, IExplicitInterface { private int value; public int Value { get { return value; } set { this.value = value; RaiseChanged(() =&gt; this.Value); } } double IExplicitInterface.DoubleValue { get { return value; } set { this.value = (int)value; RaiseChanged(() =&gt; ((IExplicitInterface)this).DoubleValue); } } } ...Read full article

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• A better way to encourage contributions to OSS

  - by Daniel Cazzulino

  Currently in the .NET world, most OSS projects are available via a NuGet package. Users have a very easy path towards *using* the project right away. But let’s say they encounter some isssue (maybe a bug, maybe a potential improvement) with the library. At this point, going from user to contributor (of a fix, or a good bug repro or even a spike for a new feature) is a very steep and non trivial multi-step process of registering with some open source hosting site (codeplex, github, bitbucket, etc.), learning how to grab the latest sources, build the project, formulate a patch (or fork the code), learn the source control software they use (mercurial, git, svn, tfs), install whatever tools are needed for it, read about the contributors workflow for the project (do you fork &amp; send pull requests? do you just send a patch file? do you just send a snippet? a unit test? etc.), and on, and on, and on. Granted, you may be lucky and already know the source control system the project uses, but in really, I’d say the chances are pretty low. I believe most developers *using* OSS are far from familiar with them, much less with contributing back to various projects. We OSS devs like to be on the cutting edge all the time, ya’ know, always jumping on the new SCC system, the new hosting site, the new agile way of managing work items, bug tracking, code reviews, etc. etc. etc.. But most of our OSS users are largely the “... Read full article

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• How to use T4 templates in WP7, Silverlight, Desktop or even MonoDroid apps

  - by Daniel Cazzulino

  In other words, how to use T4 templates without ANY runtime dependencies? Yes, it is possible, and quite simple and elegant actually. In a desktop project, just open the Add New Item dialog, and search for "text template": From the two available templates, the one that gives you a zero-dependency runtime-usable template is the first one: Preprocessed Text Template. Once unfolded, you get the .tt file, but also a dependent .cs file automatically generated. Note the Custom Tool associated with the file: If you open up the .cs file, you will see that it doesn't contain the rendered "Hello World!!!" I added in the .tt, but rather a full class named after the template file itself: namespace ConsoleApplication1 { using System; #line 1 "C:\Temp\ConsoleApplication1\ConsoleApplication1\PreTextTemplate1.tt" [System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.TextTemplating", "10.0.0.0")] public partial class PreTextTemplate1 : PreTextTemplate1Base { public virtual string TransformText() { this.GenerationEnvironment = null; this.Write("Hello World!!!"); return this.GenerationEnvironment.ToString(); } } #region Base class ... #endregion } ... Read full article

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• How to mock a dynamic object

  - by Daniel Cazzulino

  Someone asked me how to mock a dynamic object with Moq, which might be non-obvious. Given the following interface definition: public interface IProject { string Name { get; } dynamic Data { get; } } When you try to setup the mock for the dynamic property values, you get:   What’s important to realize is that a dynamic object is just a plain object, whose properties happen to be resolved at runtime. Kinda like reflection, if you will: all public properties of whatever object happens to be the instance, will be resolved just fine at runtime. Therefore, one way to mock this dynamic is to just create an anonymous type with the properties we want, and set the dynamic property to return that:...Read full article

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• MEF, IServiceProvider and Testing Visual Studio Extensions

  - by Daniel Cazzulino

  In the latest and greatest version of Visual Studio, MEF plays a critical role, one that makes extending VS much more fun than it ever was. So typically, you just [Export] something, and then someone [Import]s it and that's it. MEF in all its glory kicks in and gets all your dependencies satisfied. Cool, you say, so let's now import ITextTemplating and have some T4-based codegen going! Ah, if only it was that easy. Turns out by default, none of the VS built-in services are exposed to MEF, apparently because there wasn't enough time to analyze the lifetime, initialization, dependencies, etc. for each one before launch, which makes perfect sense. You don't want to blindly export everything now just in case. There's also the whole VS package initialization thing which in this version of VS is not so transparently integrated with the MEF publishing side (i.e. a MEF export from a package can get instantiated before its owning package, and in fact, the package can remain unloaded forever and the export will continue to be visible to anyone)....Read full article

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• Add Reference with Search

  - by Daniel Cazzulino

  If you have been using VS2010 for any significant amount of time, you surely came across the awkward, slow and hard to use Add Reference dialog. Despite some (apparent) improvements over the VS2008 behavior, in its current form it's even LESS usable than before. A brief non-exhaustive summary of the typical grief with this dialog is: Scrolling a list of *hundreds* of entries? (300+ typically) No partial matching when typing: yes, you can type in the list to get to the desired entry, but the matching is performed in an exact manner, from the beginning of the assembly name. So, to get to the (say) "Microsoft.VisualStudio.Settings" assembly, you actually have to type the first two segments in their entirety before starting to type "Settings"....Read full article

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• How to exclude copy local referenced assemblies from a VSIX

  - by Daniel Cazzulino

  When you add library references to project that are not reference assemblies or installed in the GAC, Visual Studio defaults to setting Copy Local to True: If, however, those dependencies are distributed by some other means (i.e. another extension, or are part of VS private assemblies, or whatever) and you want to avoid including them in your VSIX, you can add the following property to the project file: &lt;PropertyGroup&gt; ... &lt;IncludeCopyLocalReferencesInVSIXContainer&gt;false&lt;/IncludeCopyLocalReferencesInVSIXContainer&gt;Read full article

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