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• How can a large, Fortran-based number crunching codebase be modernized?

  - by Dave Mateer

  A friend in academia asked me for advice (I'm a C# business application developer). He has a legacy codebase which he wrote in Fortran in the medical imaging field. It does a huge amount of number crunching using vectors. He uses a cluster (30ish cores) and has now gone towards a single workstation with 500ish GPUS in it. However where to go next with the codebase so: Other people can maintain it over next 10 year cycle Get faster at tweaking the software Can run on different infrastructures without recompiles After some research from me (this is a super interesting area) some options are: Use Python and CUDA from Nvidia Rewrite in a functional language. For example, F# or Haskell Go cloud based and use something like Hadoop and Java Learn C What has been your experience with this? What should my friend be looking at to modernize his codebase? UPDATE: Thanks @Mark and everyone who has answered. The reasons my friend is asking this question is that it's a perfect time in the projects lifecycle to do a review. Bringing research assistants up to speed in Fortran takes time (I like C#, and especially the tooling and can't imagine going back to older languages!!) I liked the suggestion of keeping the pure number crunching in Fortran, but wrapping it in something newer. Perhaps Python as that seems to be getting a stronghold in academia as a general-purpose programming language that is fairly easy to pick up. See Medical Imaging and a guy who has written a Fortran wrapper for CUDA, Can I legally publish my Fortran 90 wrappers to Nvidias' CUFFT library (from the CUDA SDK)?.

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• What could be my path? Networking, programming, or something else?

  - by momong

  Well first and foremost, I would like to give my brief description: I was an aviation student but I didn't pursue that path because I lost my interest. Now I'm an I.T. student and currently stopped schooling because of confusion. I don't know which path I should choose: could it be programming or networking? Someone told me that on networking the money is easy, the job is easy. Others told me that programming is best suited for me because I'm very skilled and excellent at figures. I want to chose networking, but I can't find my passion for it, my mind tells me but my heart doesn't... and on programming, I don't know which language I should pick or if I like it or not. A good mentor, even if only online, would be a very big plus to me, but I don't think if there are many who could spent their time on teaching a nobody... but I'm very eager to learn. My real passion is gaming! I want to work in the gaming industry, I want to be a man behind those games! I've been a gamer freak since birth. But I don't know how to get in to that industry. I don't know what to do. I don't know which path would really suit me. Sorry if some of you find this a pointless question, but please bear with me, this could be the turn of my life.

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• Why is Adobe Air so underrated for building mobile apps?

  - by Marcelo de Assis

  I worked with Adobe Flash related technologies for the last 5 years, although not being a big fan of Adobe. I see some little bugs happening in some apps, but I cannot imagine why a lot of big companies do not even think to use use Adobe Air as a good technology for their mobile apps. I see a lot of mobile developer positions asking for experts in Android or iOS , but very much less positions asking for Adobe Air, even when Adobe Air apps have the advantage of being multi-plataform, with the same app working in Blackberry, iOS and Android. Is so much easier to develop a game using Flash, than using Android SDK, for example. It really have flaws (that I never saw) or it is just some kind of mass prejudgement? I also would like to hear what a project manager or a indie developer takes when choosing a plataform for building apps.

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• Entity Framework with large systems - how to divide models?

  - by jkohlhepp

  I'm working with a SQL Server database with 1000+ tables, another few hundred views, and several thousand stored procedures. We are looking to start using Entity Framework for our newer projects, and we are working on our strategy for doing so. The thing I'm hung up on is how best to split the tables into different models (EDMX or DbContext if we go code first). I can think of a few strategies right off the bat: Split by schema We have our tables split across probably a dozen schemas. We could do one model per schema. This isn't perfect, though, because dbo still ends up being very large, with 500+ tables / views. Another problem is that certain units of work will end up having to do transactions that span multiple models, which adds to complexity, although I assume EF makes this fairly straightforward. Split by intent Instead of worrying about schemas, split the models by intent. So we'll have different models for each application, or project, or module, or screen, depending on how granular we want to get. The problem I see with this is that there are certain tables that inevitably have to be used in every case, such as User or AuditHistory. Do we add those to every model (violates DRY I think), or are those in a separate model that is used by every project? Don't split at all - one giant model This is obviously simple from a development perspective but from my research and my intuition this seems like it could perform terribly, both at design time, compile time, and possibly run time. What is the best practice for using EF against such a large database? Specifically what strategies do people use in designing models against this volume of DB objects? Are there options that I'm not thinking of that work better than what I have above? Also, is this a problem in other ORMs such as NHibernate? If so have they come up with any better solutions than EF?

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• Suggestions for connecting .NET WPF GUI with Java SE Server

  - by Sam Goldberg

  BACKGROUND We are building a Java (SE) trading application which will be monitoring market data and sending trade messages based on the market data, and also on user defined configuration parameters. We are planning to provide the user with a thin client, built in .NET (WPF) for managing the parameters, controlling the server behavior, and viewing the current state of the trading. The client doesn't need real-time updates; it will instead update the view once every few seconds (or whatever interval is configured by the user). The client has about 6 different operations it needs to perform with the server, for example: CRUD with configuration parameters query subset of the data receive updates of current positions from server It is possible that most of the different operations (except for receiving data) are just different flavors of managing the configuration parameters, but it's too early in our analysis for us to be sure. To connect the client with the server, we have been considering using: SOAP Web Service RESTful service building a custom TCP/IP based API (text or xml) (least preferred - but we use this approach with other applications we have) As best as I understand, pros and cons of the different web service flavors are: SOAP pro: totally automated in .NET (and Java), modifying server side interface require no code changes in communication layer, just running refresh on Web Service reference to regenerate the classes. con: more overhead in the communication layer sending more text, etc. We're not using J2EE container so maybe doesn't work so well with J2SE REST pro: lighter weight, less data. Has good .NET and Java support. (I don't have any real experience with this, so don't know what other benefits it has.) con: client will not be automatically aware if there are any new operations or properties added (?), so communication layer needs to be updated by developer if server interface changes. con: (both approaches) Server cannot really push updates to the client at regular intervals (?) (However, we won't mind if client polls the server to get updates.) QUESTION What are your opinions on the above options or suggestions for other ways to connect the 2 parts? (Ideally, we don't want to put much work into the communication layer, because it's not the significant part of the application so the more off-the-shelf and automated the better.)

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• The University with the best Computer Science degree?

  - by Shinnok

  Which University provides the best Computer Science degree in your opinion(non US Universities welcomed too)? I do realize that you most probably didn't attend more then one University so you can't really provide a truly insightful opinion on several institutions, but what you can do instead, is describe the one you attended and outline it's strengths and weaknesses. What do i mean by the best is essentially the University that upon graduation and given a subject's assumed reasonable level of passion and interest in the field, one can trust upon the fact he was at least exposed to the best and most deep, correct and up to date courses on Programming, Operating Systems, Internet and Computer Technology overall. We have all heard of recent horror stories in Computer Science teaching, thus an exposure the best of the best, essentially the University you would grant your children to if they were to be interested into this field, would be a great thing.

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• How should a developer reject impossible requirements?

  - by sugar

  Here's the problem I'm facing: Quote From Project Manager: Hey Sugar, I'm assigning you the task of developing a framework that could be used for many different iOS applications. Here are the requirements: It should be able to detect the thickness of the thumb or fingers being used to manipulate the UI. With this information, all elements of the UI should be arranged & sized automatically. For a larger thumb, elements should be arranged nearer the center of the screen. For a smaller thumb, elements should be arranged nearer the corners of the screen. For a larger thumb, all fonts should be smaller. (We're assuming an adult in this case.) For a smaller thumb, all fonts should be larger. (We're assuming a younger person in this case.) Summary: This framework is required for creating user-friendly user interfaces programmatically. The framework should be developed in such a way that we can use for as many projects as needed, so it must also be very developer-friendly. I am the developer given this task, so my questions are as follows: How can I explain that these requirements are a little ridiculous? How can I explain that it would be better to concentrate on developing actual projects? How can I explain that even if this were possible, I wouldn't recommended developing such a thing? How do I say NO to this project politely, gently, and respectfully? How can I explain that even for a developer with 3 years of experience, this might not be possible?

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• Does waterfall require code complete before QA steps in?

  - by P.Brian.Mackey

  The process used at a certain company consists of: Create a layout according to some designs made in a web page design tool. (CSS, html) Requirements come in with "functional requirements". These consist of 100's of lines of business directions. E.G. Create a Table on page X. Column1 has numeric data. Column1 is the client code. Column2 is a string...etc. Write code to meet all functional requirements. When all code is checked in, send to QA (which is the BA that wrote the requirements) for inspection, bug finds and change requests. Punt back to developer with a list of X bugs and Y change requests. While bug finds or change requests 0 go to step 4. The agile development environments I have worked in allow, if not demand, early QA inspection and early user acceptance. So, pieces of the program can be refined and redefined before the entire application is in place. Not only that, but the process leaves little room for error or people changing their minds. Instead, those "change requests" come in at the last stage when they do the most damage. And being that a bug-fix's cost increases over time, this is a costly way to write code. I am no waterfall expert. As described, is this waterfall being mishandled in some way? How does waterfall address my concerns?

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• What exactly is "Web API" in ASP.Net MVC4?

  - by James P. Wright

  I know what a Web API is. I've written API's in multiple languages (including in MVC3). I'm also well practiced in ASP.Net. I just discovered that MVC4 has "Web API" and without going through the video examples I can't find a good explanation of what exactly it IS. From my past experience, Microsoft technologies (especially ASP.Net) have a tendency to take a simple concept and wrap it in a bunch of useless overhead that is meant to make everything "easier". Can someone please explain to me what Web API in MVC4 is exactly? Why do I need it? Why can't I just write my own API?

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• ASP.NET AJAX and my axe!

  - by Marlon

  So, I'm seriously considering axing ASP.NET AJAX from my future projects as I honestly feel it's too bloated, and at times convoluted. I'm also starting to feel it is a dying library in the .NET framework as I hardly see any quality components from the open-source community. All the kick-ass components are usually equally bloated commercial components... It was cool at first, but now I tend to get annoyed with it more than anything else. I'm planning on switching over to the jQuery library as just about everything in ASP.NET AJAX is often easily achievable with jQuery, and, more often than not, more graceful of a solution that ASP.NET AJAX and it has a much stronger open-source community. Perhaps, it's just me, but do you feel the same way about ASP.NET AJAX? How was/is your experience working with ASP.NET AJAX?

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• Which useful alternative control structures do you know?

  - by bigown

  Similar question was closed on SO. Sometimes when we're programming, we find that some particular control structure would be very useful to us, but is not directly available in our programming language. What alternative control structures do you think are a useful way of organizing computation? The goal here is to get new ways of thinking about structuring code, in order to improve chunking and reasoning. You can create a wishful syntax/semantic not available now or cite a less known control structure on an existent programming language. Answers should give ideas for a new programming language or enhancing an actual language. Think of this as brainstorming, so post something you think is a crazy idea but it can be viable in some scenario. It's about imperative programming.

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• AJAX event, prevents other page actions

  - by cobaltduck

  Here's a fairly average scenario, using JSF as an example, but this same concept I have observed in ASP.NET, Apache Wicket, and other frameworks with ajax capabilities. <h:inputText id="text1" value="#{myBacker.myBean.myStringVar}" styleClass="goodCSS"> <f:ajax event="change" listener="#{myBacker.text1ChangeEventMethod}" update="someOtherField" /> </h:inputText> <h:selectBooleanCheckbox id="check1" value="#{myBacker.myBean.myBoolVar}" /> Let's suppose that the 'text1ChangeEventListener' is essential to 'someOtherField' and perhaps toggles its disabled attribute, or changes its available options, based on the value of 'myStringVar.' The particulars aren't important, let's just accept that for some reason we need an ajax call when the 'text1' value is changed. So Jane User is working her way down the form. She arrives at the 'text1' field and types some value. The cursor focus is still in the text field, as she moves her mouse to the 'check1' box and clicks. It appears to her that nothing has happened. She clicks again, and this time the checkbox highlights and the icon indicating a selection appears in the box. Jane has to do several entries in the form today, and sees this happen every time, and it becomes very frustrating for her. Likewise, Jeff Admin is also perusing this form, and begins to type in 'text1.' He then realizes he doesn't really want to enter this data, and so moves his mouse to the "cancel" button elsewhere on the page, and clicks. Nothing seems to happen. Jeff clicks again, and after confirming he really does want to cancel, is returned to the home page. Jeff scratches his head. The problem is simply that the first thing the system does after 'text1' looses focus is run the listener and perform the ajax operation. It may only take a fraction of a second, but still, you can click other buttons all you want, but until that ajax has finished, everything else is ignored. I've spent the morning searching and reading, and it seems no one else has even noticed this. I could find not one article, blog, past question here or at SO, or anyting that addresses this obvious and glaring deficiency in ajax. So first of all, am I truly alone in thinking this is a big problem? Second, does anyone have a solution?

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• Are there examples of non CRUD approaches?

  - by Pieter B

  I'm a programmer but also have worked as an archivist. As archivist it's a lot about keeping data. I often get into arguments with colleagues when it comes to operations on data. I don't like the U and the D in CRUD too much. Rather then update a record I prefer to add a new one and have a reference to the old record. That way you build a history of changes. I also don't like deleting records but rather mark them as inactive. Is there a term for this? Basically only creating and reading data? Are there examples of this approach?

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• null pointers vs. Null Object Pattern

  - by GlenH7

  Attribution: This grew out of a related P.SE question My background is in C / C++, but I have worked a fair amount in Java and am currently coding C#. Because of my C background, checking passed and returned pointers is second-hand, but I acknowledge it biases my point of view. I recently saw mention of the Null Object Pattern where the idea is than an object is always returned. Normal case returns the expected, populated object and the error case returns empty object instead of a null pointer. The premise being that the calling function will always have some sort of object to access and therefore avoid null access memory violations. So what are the pros / cons of a null check versus using the Null Object Pattern? I can see cleaner calling code with the NOP, but I can also see where it would create hidden failures that don't otherwise get raised. I would rather have my application fail hard (aka an exception) while I'm developing it than have a silent mistake escape into the wild. Can't the Null Object Pattern have similar problems as not performing a null check? Many of the objects I have worked with hold objects or containers of their own. It seems like I would have to have a special case to guarantee all of the main object's containers had empty objects of their own. Seems like this could get ugly with multiple layers of nesting.

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• Stereo images rectification and disparity: which algorithms?

  - by alessandro.francesconi

  I'm trying to figure out what are currently the two most efficent algorithms that permit, starting from a L/R pair of stereo images created using a traditional camera (so affected by some epipolar lines misalignment), to produce a pair of adjusted images plus their depth information by looking at their disparity. Actually I've found lots of papers about these two methods, like: "Computing Rectifying Homographies for Stereo Vision" (Zhang - seems one of the best for rectification only) "Three-step image recti?cation" (Monasse) "Rectification and Disparity" (slideshow by Navab) "A fast area-based stereo matching algorithm" (Di Stefano - seems a bit inaccurate) "Computing Visual Correspondence with Occlusions via Graph Cuts" (Kolmogorov - this one produces a very good disparity map, with also occlusion informations, but is it efficient?) "Dense Disparity Map Estimation Respecting Image Discontinuities" (Alvarez - toooo long for a first review) Anyone could please give me some advices for orienting into this wide topic? What kind of algorithm/method should I treat first, considering that I'll work on a very simple input: a pair of left and right images and nothing else, no more information (some papers are based on additional, pre-taken, calibration infos)? Speaking about working implementations, the only interesting results I've seen so far belongs to this piece of software, but only for automatic rectification, not disparity: http://stereo.jpn.org/eng/stphmkr/index.html I tried the "auto-adjustment" feature and seems really effective. Too bad there is no source code...

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• Can I use MSBuild to build old VS6 C++ projects?

  - by awe

  I have a build computer where Visual Studio not installed, only MSbuild which can build VS2008 projcets without having any Visual Studio installed. I wonder whether it is possible to use MSbuild with VC++ 6.0 project files, although I am thinking this could not be possible. In the past I have used it with a VS2008 solution file for C++, but not for building C++ 6.0 dsw file. For Vb6 we have an extension package for Msbuild (MSBuild.ExtensionPack.VisualStudio.VB6). Is anything similar available for C++ 6.0 projects? An alternative could be if there are lightweight build tools that can built VC6++ .dsw files without having to install Visual Studio 6.0 ?

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• How to deal with a boss who is extremely competitive [closed]

  - by user72101

  Okay, so I recently joined this group. My boss who I reported to, left a while ago and my colleague was made the team lead. We both now report to the same head, but she heads the team I work in. I am not sure on how to deal with various situations. I would imagine a team lead who motivates the rest of the team, and not someone who would take credit for what others do. I am the only one who works at the same geographic location. She is very smart, no doubt about it. Things get to me, for example I work on an issue and email a dev team, she would respond on top of my emails and as she is the lead, people respond to her rather than to me. If there is an email addressed with the head on it, she would get it to faster than I do, even when she knew I am looking into it. The rest of the team keeps asking me questions or help. I find it hard to say no, and I try to help them as i feel I might need their help someday as well. I slack in my own work or I could have used the time to learn things. I feel that she should be the go to person and not me. If one gets the benefits of being a lead, why not the work that goes with it? I feel I am stuck in a very unfortunate situation and am totally helpless about it. Everyday it is something or the other. I work on a project for months and finally when it is about to go live and there was a minor issue and the head started asking questions, she completely stole my thunder on a call. She would not let me speak and I have to actually cut her off to speak up. The ideal would be not to give it a thought and just do the best I can,but I feel I am capable of much more and not able to give my best because of this constant war at work. Neetu

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• WCF Versioning, Naming and Endpoint URL

  - by Vinothkumar VJ

  I have a WCF Service and a Main Lib1. Say, I have a Save Profile Service. WCF gets data (with predefined data contract) from client and pass the same to the Main Class Lib1, generate response and send it back to client. WCF Method : SaveProfile(ProfileDTO profile) Current Version 1.0 ProfileDTO have the following UserName Password FirstName DOB (In string yyyy-mm-dd) CreatedDate (In string yyyy-mm-dd) Next Version (V2.0) ProfileDTO have the following UserName Password FirstName DOB (In UnixTimeStamp) CreatedDate (In UnixTimeStamp) Version 3.0 ProfileDTO have the following (With change in UserName and Password length validation) UserName Password FirstName DOB (In UnixTimeStamp) CreatedDate (In UnixTimeStamp) In simple we have DataContract and Workflow change between each version 1. How do I name the methods in WCF Service and Main Class Lib1? 2. Do I have to go with any specific pattern for ease development and maintenance? 3. Do I have to have different endpoints for different version? In the above example I have a method named “SaveProfile”. Do I have to name the methods like “SaveProfile1.0”, “SaveProfile2.0”, etc. If that is the case when there is no change between Version “3.0” and “4.0” then there will difficult in maintenance. I’m looking for a approach that will help in ease maintenance

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• Need help understanding a recursion example in Python

  - by Ali Mustafa

  Python is my first programming language, and I'm learning it from "How to Think Like a Computer Scientist". In Chapter 5 the author gives the following example on recursion: def factorial(n): if n == 0: return 1 else: recurse = factorial(n-1) result = n * recurse return result I understand that if n = 3, then the function will execute the second branch. But what I don't understand is what happens when the function enters the second branch. Can someone explain it to me?

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• web application load / stress testing services

  - by Booji Boy

  Can you recommend reputable companies that offer help (consulting services, etc) in load testing (ASP.NET) web applications? We have a client looking to load test an ASP.NET application and we don't have any expertise in load testing web applications. The client is located in central Massachusetts. My employer http://www.goADNET.com was looking for an option besides, “I can figure out how to do it”.

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• Should I create my own Assert class based on these reasons?

  - by Mike

  The main reason I don't like Debug.Assert is the fact that these assertions are disabled in Release. I know that there's a performance reason for that, but at least in my situation I believe the gains would outweigh the cost. (By the way, I'm guessing this is the situation in most cases). And yes, I know that you can use Trace.Assert instead. But even though that would work, I find the name Trace distracting, since I don't see this as tracing. The other reason to create my own class is laziness I guess, since I could write methods for the most usual cases like Assert.IsNotNull, Assert.Equals and so forth. The second part of my question has to do with using Environment.FailFast in this class. Would that be a good idea? I do like the ideas put forth in this document. That's pretty much where I got the idea from. One last point. Does creating a design like this imply having an untestable code path, as described in this answer by Eric Lippert on a different (but related) question?

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• Which software development methodologies can be seen as foundations

  - by Bas

  I'm writing a small research paper which involves software development methodologiess. I was looking into all the available methodology's and I was wondering, from all methodologies, are there any that have provided the foundations for the others? For an example, looking at the following methodologies: Agile, Prototyping, Cleanroom, Iterative, RAD, RUP, Spiral, Waterfall, XP, Lean, Scrum, V-Model, TDD. Can we say that: Prototyping, Iterative, Spiral and Waterfall are the "foundation" for the others? Or is there no such thing as "foundations" and does each methodology has it's own unique history? I would ofcourse like to describe all the methodology's in my research paper, but I simply don't have the time to do so and that is why I would like to know which methodologies can be seen as representatives.

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• Questions about Microsoft's new Cloud certification

  - by makerofthings7

  I'm evaluating taking the cloud certification exams from Microsoft, and have a few questions How highly do you think employers will value this exam? What job roles would require this cert? In your personal experience, how would this certification be weighed against other factors such as real world experience, other certifications, and having a Bachelors degree? If you mention that other certifications are more valued, which ones are they?

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• PHP usage outside the web?

  - by Anto

  As you probably are aware, PHP is not only usable for web programming, but also desktop programming. It even has things such as GTK bindings. Do you have any examples of places where PHP is actually used outside web programming for anything more than just very trivial programs? Do you know of any desktop program which uses PHP to some extent (e.g. as Python could be used in a C program)? Note: I don't program in PHP myself, I'm just curious

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• How to concentrate on one project at a time. Divide and Conquer doesn't work for me [closed]

  - by refhat

  Possible Duplicate: Tips for staying focused and motivated on a project I have serious issues on concentrating on one project at a time. I cant even follow the Divide and Conquer Approach. Once I start a project, I try to get the things done as neatly as possible but very soon I end up messing so many components of it. I try to do divide and conquer, but my approach doesn't work smoothly, and then I then wonder here and there in other projects. Sometimes I try spending so many hours for some trivial issues, which in-fact are not even issues. How do I avoid this jargon and be a smooth developer and have a nice workflow around my projects. I tend to loose my concentration on the current project and wonder in another project.

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