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  • Common mistakes which lead to corrupted invariants

    - by Dave B.
    My main source of income is web development and through this I have come to enjoy the wonders of programming as my knowledge of different languages has increased over the years through work and personal play. At some point I reached a decision that my college education was not enough and that I wanted to go back to school to get a university degree in either computer science or software engineering. I have tried a number of things in my life and it took me a while before I found something that I feel is a passion and this is it. There is one aspect of this area of study that I find throws me off though. I find the formal methods of proving program correctness a challenge. It is not that I have trouble writing code correctly, I can look at an algorithm and see how it is correct or flawed but I struggle sometimes to translate this into formal definitions. I have gotten perfect or near perfect marks on every programming assignment I have done at the college level but I recently got a swath of textbooks from a guy from univeristy of waterloo and found that I have had trouble when it comes to a few of the formalisms. Well at this point its really just one thing specifically, It would really help me if some of you could provide to me some good examples of common mistakes which lead to corrupted invariants, especially in loops. I have a few software engineering and computer science textbooks but they only show how things should be. I would like to know how things go wrong so that it is easier to recognize when it happens. Its almost embarrassing to broach this subject because formalisms are really basic foundations upon which matters of substance are built. I want to overcome this now so that it does not hinder me later.

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  • How to conciliate OOAD and Database Design?

    - by user1620696
    Recently I've studied about object oriented analysis and design and I liked a lot about it. In every place I've read people say that the idea is to start with the minimum set of requirements and go improving along the way, revisiting this each iteration and making it better as we contiuously develop and contact the customer interested in the software. In particular, one course from Lynda.com said a lot of that: we don't want to spend a lot of time planing everything upfront, we just want to have the minimum to get started and then improve this each iteration. Now, I've also seem a course from the same guy about database design, and there he says differently. He says that although when working with object orientation he likes the agile iterative approach, for database design we should really spend a lot of time planing things upfront instead of just going along the way with the minimum. But this confuses me a little. Indeed, the database will persist important data from our domain model and perhaps configurations of the software and so on. Now, if I'm going to continuously revist the analysis and design of the model, it seems the database design should change also. In the same way, if we plan all the database upfront it seems we are also planing all the model upfront, so the two ideas seems to be incompatible. I really like agile iterative approach, but I'm also looking at getting better design for the database also, so when working with agile iterative approach, how should we deal with the database design?

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  • Are You Using Windows Live Mesh?

    - by Ben Griswold
    Most of the time, I’m the guy who authors the show notes for the Herding Code Podcast.  The workflow is relatively straight-forward: Jon shares the pre-production audio with me, I compete my write up and then ship the notes back to Jon for publishing with the edited audio.  All file sharing is all done with shared folders in the Windows Live Mesh. The director of my kid’s preschool was looking for a way to access her work computer from her home office.  VPN connection?  Remote desktop?  FTP?  Nope. I installed Windows Live Mesh in a matter of minutes, synchronized a number of folders and she was off and running.  (The neat thing is she’s running a PC in the office and a Mac at home.) I was using Dropbox before discovering Mesh. Dropbox is still very cool but I’m in and out of Mesh enough that it’s taken over.  Actually I still have a Dropbox folder – it’s just being synched by Mesh now. If you’re interested in giving Live Mesh a whirl, here’ are the notable links as found on the product’s site: What you need Create your mesh Sync folders Share folders Use your Live Desktop Connect to a remote computer Use a mobile phone Good luck!

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  • Inside Red Gate - Introduction

    - by Simon Cooper
    I work for Red Gate Software, a software company based in Cambridge, UK. In this series of posts, I'll be discussing how we develop software at Red Gate, and what we get up to, all from a dev's perspective. Before I start the series proper, in this post I'll give you a brief background to what I have done and continue to do as part of my job. The initial few posts will be giving an overview of how the development sections of the company work. There is much more to a software company than writing the products, but as I'm a developer my experience is biased towards that, and so that is what this series will concentrate on. My background Red Gate was founded in 1999 by Neil Davidson & Simon Galbraith, who continue to be joint CEOs. I joined in September 2007, and immediately set to work writing a new Check for Updates client and server (CfU), as part of a team of 2. That was finished at the end of 2007. I then joined the SQL Compare team. The first large project I worked on was updating SQL Compare for SQL Server 2008, resulting in SQL Compare 7, followed by a UI redesign in SQL Compare 8. By the end of this project in early 2009 I had become the 'go-to' guy for the SQL Compare Engine (I'll explain what that means in a later post), which is used by most of the other tools in the SQL Tools division in one way or another. After that, we decided to expand into Oracle, and I wrote the prototype for what became the engine of Schema Compare for Oracle (SCO). In the latter half of 2009 a full project was started, resulting in the release of SCO v1 in early 2010. Near the end of 2010 I moved to the .NET division, where I joined the team working on SmartAssembly. That's what I continue to work on today. The posts in this series will cover my experience in software development at Red Gate, within the SQL Tools and .NET divisions. Hopefully, you'll find this series an interesting look at what exactly goes into producing the software at Red Gate.

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  • The art of Unit Testing with Examples in .NET

    - by outcoldman
    First time when I familiarized with unit testing was 5 or 6 years ago. It was start of my developing career. I remember that somebody told me about code coverage. At that time I didn’t write any Unit tests. Guy, who was my team lead, told me “Do you see operator if with three conditions? You should check all of these conditions”. So, after that I had written some code, I should go to interface and try to invoke all code which I wrote from user interface. Nice? At current time I know little more about tests and unit testing. I have not participated in projects, designed by Test Driven Development (TDD). Basics of my knowledge are a spying code of my colleagues, some articles and screencasts. I had decide that I should know much more, and became a real professional of unit testing, this is why I had start to read book The art of Unit Testing with Examples in .NET. More than, in my current job place looks like I’m just one who writing unit tests for my code. I should show good examples of my tests. ,a href="http://outcoldman.ru/en/blog/show/267"Read more...

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  • How come many project-hosting sites doesn't have a forum feature?

    - by george
    I'm considering starting an open-source project, so I shopped around some popular project hosting sites. What I find surprising is that many (see here for a nice feature table) of the popular project hosting sites (e.g. GitHub, BitBucket) don't have a forum feature, i.e. a place where users can talk to the devs, ask questions, raise ideas, etc. IMHO an active forum is an important factor in creating a user community around a project, so I would expect that most project owners would be interested in such a feature. I've also noticed that some projects do have support forums (or mailing lists) hosted elsewhere - e.g. Ruby on Rails is hosted on GitHub but has a Google Groups support group, and TortoiseHG is hosted on BitBucket but has a mailing list on SourceForge - so it's not like this feature is unneeded. So how come many project hosting sites don't have a forum feature?

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  • Learning frameworks without learning languages

    - by Tom Morris
    I've been reading up on GUI frameworks including WPF, GTK and Cocoa (UIKit). I don't really do anything related to Windows (I'm a Mac and Linux guy) or .NET, but I'd like to be able to throw together GUIs for various operating systems. We are in the enviable position now of having high level scripting languages that work with all of the major GUI toolkits. If you are doing Linux GUI programming, you could use GTK in C, but why not just use PyGTK (or PyQt). Similarly, for Java, one can use JRuby. For Mac, there's MacRuby. And on .NET, there's IronRuby. This is all fine and good, and if you are building a serious project, there are tradeoffs that you might encounter when deciding whether to, say, build a WPF app in C# or in IronRuby, or whether you are going to use PyGTK or not. The subjective question I have is: what about learning those frameworks? Are there strong reasons why one should or should not learn something like WPF or Cocoa in a language one is familiar with rather than having to learn a new language as well? I'm not saying you should never learn the language. If you are building Windows applications and you don't know C#, that might be a bit of a problem. But do you think it is okay to learn the framework first? This is both a general question and a specific question. I've used some Cocoa classes from Ruby and Python using things like PyObjC and there always seems to be an impedance mismatch because of the way Objective C libraries get built. Experiences and strong opinions welcome!

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  • Change in Job Title and Responsibilities

    - by John Conwell
    I've spent the past 7 years focused primarily on code and database performance.  It's an area that I have a passion for, as well as a propensity.  But what I've found is that its very hard to change the culture of a development environment.  You can teach performance, you can encourage performance, you might see slight shift in how devs think about performance.  But without full management backing and support you wont get long lasting changes in the development culture.  And in the end, you are back to being the "Perf Guy", fixing performance design flaws, after the fact, one by one by one. Which is why last year I asked my boss to changed my title and responsibilities to more naturally align with the team I was working for.  So now I'm a Computing Research Engineer (vague, I know), researching in the field of Big Data analytics and visualization. I've found this change revitalizing and a lot of fun.  And given the nature of Big Data (its, um…big) the performance aspects are always ever present.

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  • My Message to the Software Craftsmanship Group

    - by Liam McLennan
    This is a message I posted to the software craftsmanship group, looking for a week-long, pairing / skill sharing opportunity in the USA. I am a journeyman software craftsman, currenlty living and working in Brisbane Australia. In April I am going to travel to the US to attend Alt.Net Seattle and Seattle codecamp. In between the two conferences I have five days in which I would like to undertake a craftsmanship mini-apprenticeship, pairing and skill sharing with your company. I do not require any compensation other than the opportunity to assist you and learn from you. Although my conferences are in Seattle I am happy to travel anywhere in the USA and Canada (excluding Hawaii :) ). Things I am good at: .NET web development, javascript, creating software that solves problems Things I am learning: Ruby, Rails, javascript If you are interested in having me as visiting craftsman from the 12th to the 16th of April please reply on this mailing list or contact me directly. Liam McLennan Now I wait…

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  • Advice on learning programming languages and math.

    - by Joris Ooms
    I feel like I'm getting stuck lately when it comes to learning about programming-related things; I thought I'd ask a question here and write it all down in the hope to get some pointers/advice from people. Perhaps writing it down helps me put things in perspective for myself aswell. I study Interactive Multimedia Design. This course is based on two things: graphic design on one hand, and web development on the other hand. I have quite a decent knowledge of web-related languages (the usual HTML/JS/PHP) and I'll be getting a course on ASP.NET next year. In my free time, I have learnt how to work with CodeIgniter, aswell as some diving into Ruby (and Rails) and basic iOS programming. In my first year of college I also did a class on Java (19/20 on the end result). This grade doesn't really mean anything though; I have the basics of OOP down but Java-wise, we learnt next to nothing. Considering the time I have been programming in, for example, PHP.. I can't say I'm bad at it. I'm definitely not good or great at it, but I'm decent. My teachers tell me I have the programming thing down. They just tell me I should keep on learning. So that's what I do, and I try to take in as much as possible; however, sometimes I'm unsure where to start and I have this tendency to always doubt myself. Now, for the 'question'. I want to get into iOS programming. I know iOS programming boils down to programming in Cocoa Touch and Objective-C. I also know Obj-C is a superset of C. I have done a class on C a couple of years ago, but I failed miserably. I got stuck at pointers and never really understood them.. Until like a month ago. I suddenly 'got' it. I have been working through a book on Objective-C for a week or so now, and I understand the basics (I'm at like.. chapter 6 or so). However, I keep running into similar problems as the ones I had when I did the C class: I suck at math. No, really. I come from a Latin-Modern Languages background in high school and I had nearly no math classes back then. I wanted to study Computer Science, but I failed there because of the miserable state of my mathematics knowledge. I can't explain why I'm suddenly talking about math here though, because it isn't directly related to programming.. yet it is. For example, the examples in the book I'm reading now are about programming a fraction-calculator. All good, I can do the programming when I get the formulas down.. but it takes me a full day or more to actually get to that point. I also find it hard to come up with ideas for myself. I made one small iOS app the other day and it's just a button / label kind of thing. When I press the button, it generates a random number. That's really all I could come up with. Can you 'learn' that? It probably comes down to creativity, but evidently, I'm not too great at being creative. Are there any sites or resources out there that provide something like a basic list of things you can program when you're just starting out? Maybe I'm focusing on too many things at once. I want to keep my HTML/CSS at a decent level, while learning PHP and CodeIgniter, while diving into Ruby on Rails and learning Objective-C and the iOS SDK at the same time. I just want to be good at something, I guess. The problem is that I can't seem to be happy with my PHP stuff. I want more, something 'harder'; that's why I decided to pick up the iOS thing. Like I said, I have the basics down of a lot of different languages. I can program something simple in Java, in C, in Objective-C as of this week.. but it ends there. Mostly because I can't come up with ideas for more complex applications, and also because I just doubt myself: 'Oh, that's too complex, I can never do that'. And then it ends there. To conclude my rant, let me basically rephrase my questions into a 'tl;dr' part. A. I want to get into iOS programming and I have basic knowledge of C/Objective-C. However, I struggle to come up with ideas of my own and implement them and I also suck at math which is something that isn't directly related to, yet often needed while programming. What can I do? B. I have an interest in a lot of different programming languages and I can't stop reading/learning. However, I don't feel like I'm good in anything. Should I perhaps focus on just one language for a year or longer, or keep taking it all in at the same time and hope I'll finally get them all down? C. Are there any resources out there that provide basic ideas of things I can program? I'm thinking about 'simple' command-line applications here to help me while studying C/Obj-C away from the whole iPhone SDK. Like I said, the examples in my book are mainly math-based (fraction calculator) and it's kinda hard. :( Thanks a lot for reading my post. I didn't plan it to be this long but oh well. Thanks in advance for any answers.

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  • SharePoint MVP Chat &ndash; tomorrow and day after

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). Yes we’re doing it again! After two very successful chats, a number of MVPs will be online in chat style answering your SharePoint questions. Here’s the schedule Tuesday May 25th at 4PM PDT (join here) Agnes Molnar Bill English Brian Farnhill Bryan Phillips Clayton Cobb David Mann <—ask him to tell a joke, he has a great sense of humor! Also bug him about Workflows. Matt McDermott Paul Stork Rob Bogue <—Ask him about WFs too. Rob Foster <— Him and Nick Swan run a SharePoint podcast. Sahil Malik <—I know him Saifullah Shafiq Ahmed   Wednesday at 9AM PDT (join here) Andrew Connell <— youngest MVP ever! LOL. Becky Bertram Bil Simser Chadima Kulathilake Claudio Brotto Gary Lapointe <—the stsadm extensions guy, ask him about powershell Darrin Bishop John Ross Michael Mukalian Muhanad Omar Randy Drisgill <—he created SP2010 starter master pages. Ask him about branding Shane Young Todd Bleeker Zlatan Dzinic Comment on the article ....

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  • Getting really weird entries in Apache log from Baidu.com?

    - by Undo
    I was looking through my server logs today, and I noticed this: (it's all one row) 118.244.179.250 - - [16/Oct/2013:20:59:25 +0000] "GET http://www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttp/www.baidu.comhttphttphttphttp/www.baidu.comhttphttphttp/www.baidu.comhttphttp/www.baidu.comhttp/www.baidu.com/ HTTP/1.1" 301 4605 "http://www.baidu.com/" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)" "GET http://www.baidu.comhttphttphttphttphttp...? Am I doing something wrong? Am I hosting someone else's website without knowing it? Is a guy named baidu trying to drive me crazy?

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  • Examples of continuous integration workflow using git

    - by Andrew Barinov
    Can anyone provide a rough outline of their git workflow that complies with continuous integration. E.g. How do you branch? Do you fast forward commits to the master branch? I am primarily working with Rails as well as client and server side Javascript. If anyone can recommend a solid CI technology that's compatible with those, that'd be great. I've looked into Jenkins but would like to check out other good alternatives. To put some context into this, I am planning on transitioning from working as a single developer into working as part of the team. I'd like to start standardizing my own personal workflow so that I can onboard new devs quickly.

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  • I don't really understand "Backend/Serverside" when it comes to web-development?

    - by Mercfh
    In the Web development world, what exactly do backend/server-side programmers do? I guess I don't really understand the whole concept. I've done the HTML/CSS layouts and website design and a little bit of SQL with PHP (still enhancing my skills, it's more of a side project for me). I've also done a small amount of JavaScript/JQuery. But I don't understand the "backend" work, such as the scripting languages (Rails/Python/etc) and such. What exactly do you "do" with them? Are there any books on the subject? I'm not even sure what it means. Is it kinda like what Web Application Frameworks do? Or not so much?

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  • Can I save & store a user's submission in a way that proves that the data has not been altered, and that the timestamp is accurate?

    - by jt0dd
    There are many situations where the validity of the timestamp attached to a certain post (submission of information) might be invaluable for the post owner's legal usage. I'm not looking for a service to achieve this, as requested in this great question, but rather a method for the achievement of such a service. For the legal (in most any law system) authentication of text content and its submission time, the owner of the content would need to prove: that the timestamp itself has not been altered and was accurate to begin with. that the text content linked to the timestamp had not been altered I'd like to know how to achieve this via programming (not a language-specific solution, but rather the methodology behind the solution). Can a timestamp be validated to being accurate to the time that the content was really submitted? Can data be stored in a form that it can be read, but not written to, in a proven way? In other words, can I save & store a user's submission in a way that proves that the data has not been altered, and that the timestamp is accurate? I can't think of any programming method that would make this possible, but I am not the most experienced programmer out there. Based on MidnightLightning's answer to the question I cited, this sort of thing is being done. Clarification: I'm looking for a method (hashing, encryption, etc) that would allow an average guy like me to achieve the desired effect through programming. I'm interested in this subject for the purpose of Defensive Publication. I'd like to learn a method that allows an every-day programmer to pick up his computer, write a program, pass information through it, and say: I created this text at this moment in time, and I can prove it. This means the information should be protected from the programmer who writes the code as well. Perhaps a 3rd party API would be required. I'm ok with that.

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  • YouTube API Office Hours May 23, 2012

    YouTube API Office Hours May 23, 2012 This is a recording of the YouTube API Hangout on Air from Wednesday 5/23 at 10am PDT (UTC-7) Jeffrey Posnick spoke about the new CORS support in the YouTube API. JJ Shannon Behrens with Jarek Wilkiewicz covered YouTube sessions schedule at Google I/O (developers.google.com Our special guests were Dror Shimshowitz and Aj Crane from the YouTube Product Management team. Dror and AJ gave a short overview of an exciting session they have coming up at Google I/O. Topics: * YouTube Channels: Get with the Program! * Getting Direct Feedback from your YouTube Community * Mobile YouTube API Apps for Content Creators, Curators and Consumers * HTML5 at YouTube: Stories from the Front Line * YouTube API + Cloud Rendering = Happy Mobile Gamers * New YouTube Android Player Tools (Session + Codelab) * Master the Latest YouTube Data API (Codelab) * Webinar: YouTube for Your Business * Webinar: Using YouTube APIs and Ruby on Rails for Educational Apps From: GoogleDevelopers Views: 649 16 ratings Time: 46:44 More in Science & Technology

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  • Compiler Dependencies [closed]

    - by asghar ashgari
    I'm a newbie researcher who's passion is programming languages (Web era). I'm wondering why all the Web frameworks and Web-based general purposes languages, have a huge number of dependencies when you want to install and then use (e.g., extend, alternate, etc.) their compilers. For example, Ruby on Rails or Scala. If I want to download their source code, and try to build it again, to me at least, feels like a can of worms. I have a MAC, so I need to install MACports, then update my XCode, then get the compiler source code that has bunch of other dependencies, then its hard to set things up; just to see the installed open-source compiler works fine.

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  • How to install older ruby version on ubuntu Precise Pangolin?

    - by Codestudent
    I got a present: older Rails tutorials that needs old ruby version. I try to install ruby-1.8 with the packet manager. I still got problems with the tutorial example code. Next I try rvm to install the old ruby version. Unfortunately I got an error. I do not know what to do. I search the internet. Many people got no problems with rvm. rvm use *ERROR: Branch origin/ruby_1_8_4 not found.* and *ERROR: Error running 'GEM_PATH="/usr/share/ruby-rvm/gems/ruby-1.8.4- tv1_8_4:/usr/share/ruby-rvm/gems/ruby-1.8.4-tv1_8_4@global:/usr/share/ruby- rvm/gems/ruby-1.8.4-tv1_8_4:/usr/share/ruby-rvm/gems/ruby-1.8.4-tv1_8_4@global" GEM_HOME="/usr/share/ruby-rvm/gems/ruby-1.8.4-tv1_8_4" "/usr/share/ruby- rvm/rubies/ruby-1.8.4-tv1_8_4/bin/ruby" "/usr/share/ruby-rvm/src/rubygems- 1.3.7/setup.rb"', please read /usr/share/ruby-rvm/log/ruby-1.8.4- tv1_8_4/rubygems.install.log* Please give me a hint.

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  • What causes bad performance in consumer apps?

    - by Crashworks
    My Comcast DVR takes at least three seconds to respond to every remote control keypress, making the simple task of watching television into a frustrating button-mashing experience. My iPhone takes at least fifteen seconds to display text messages and crashes ¼ of the times I try to bring up the iPad app; simply receiving and reading an email often takes well over a minute. Even the navcom in my car has mushy and unresponsive controls, often swallowing successive inputs if I make them less than a few seconds apart. These are all fixed-hardware end-consumer appliances for which usability should be paramount, and yet they all fail at basic responsiveness and latency. Their software is just too slow. What's behind this? Is it a technical problem, or a social one? Who or what is responsible? Is it because these were all written in managed, garbage-collected languages rather than native code? Is it the individual programmers who wrote the software for these devices? In all of these cases the app developers knew exactly what hardware platform they were targeting and what its capabilities were; did they not take it into account? Is it the guy who goes around repeating "optimization is the root of all evil," did he lead them astray? Was it a mentality of "oh it's just an additional 100ms" each time until all those milliseconds add up to minutes? Is it my fault, for having bought these products in the first place? This is a subjective question, with no single answer, but I'm often frustrated to see so many answers here saying "oh, don't worry about code speed, performance doesn't matter" when clearly at some point it does matter for the end-user who gets stuck with a slow, unresponsive, awful experience. So, at what point did things go wrong for these products? What can we as programmers do to avoid inflicting this pain on our own customers?

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  • ifconfig : Command 'ifconfig' is available in '/sbin/ifconfig'

    - by Sahil Grover
    My question is related to another open question. My echo $PATH gives me an output which is like /home/sahil/.rvm/gems/ruby-1.9.3-p125/bin:/home/sahil/.rvm/gems/ruby-1.9.3-p125@global/bin:/home/sahil/.rvm/rubies/ruby-1.9.3-p125/bin:/home/sahil/.rvm/bin:/usr/local/bin:/usr/bin:/bin:/usr/games:/home/sahil/.rvm/bin{}:/home/android-sdks/{}:/home/android-sdks/platform-tools/{}:/home/android-sdks/tools/{}:/home/sahil/android-sdks/tools{}:/home/sahil/android-sdks/tools:/home/sahil/android-sdks/platform-tools/ But running ifconfig gives me an output like Command 'ifconfig' is available in '/sbin/ifconfig' The command could not be located because '/sbin' is not included in the PATH environment variable. This is most likely caused by the lack of administrative privileges associated with your user account. ifconfig: command not found after running command like given in other question export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" it runs ifconfig but blocks other commands of ruby rails or rvm. Seeking help how to resolve this. Also why this happens?

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  • Indian school boy never misses a class for 14 years. Applies for Gunnies Records

    - by Gopinath
    If you ask the question “What is the most fun activity?” to school or college kids, most of the kids would say “bunking classes”. Many of us are grown up bunking classes in the name of stomachache, relatives marriage, high fever, rain or some other reason. Here is a wonder kid who is an exception of regular school kids. Mohammed Omar, a 17 year Indian school boy, never skipped his classes for the past 14 years. His attendance records shows 100% for all the 14 years of school he attended so far and it’s an unbelievable track record. Omar lives in Kanpur, a suburban in Uttar Pradesh with parents and a younger brother. He attended school even when the area where he lives was once flooded, had high temperature. When flooded and motor vehicles were not able to run on the streets he loaned a bicycle from neighbors. When he was on high temperature he just popped a tablet and headed towards the school.  Whatever may be the adverse situation, he just found a way to attend school instead of bunking. He recently applied for Guinness Book of World Records. The determination of the boy is incredible and inspiration to many young. I  wish to see this guy soon flashing on TV Channels with Guinness World Records certificates on his hands. Source: NDTV, creative common image: flickr/seeveeaar

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  • How does key-based caching work?

    - by Dominic Santos
    I recently read an article on the 37Signals blog and I'm left wondering how it is that they get the cache key. It's all well and good having a cache key that includes the object's timestamp (this means that when you update the object the cache will be invalidated); but how do you then use the cache key in a template without causing a DB hit for the very object that you are trying to fetch from the cache. Specifically, how does this affect One to Many relations where you are rendering a Post's Comments for example. Example in Django: {% for comment in post.comments.all %} {% cache comment.pk comment.modified %} <p>{{ post.body }}</p> {% endcache %} {% endfor %} Is caching in Rails different to just requests to memcached for example (I know that they convert your cache key to something different). Do they also cache the cache key?

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  • How could this diagram of the current most lucrative technologies be improved?

    - by Edward Tanguay
    I'm giving a talk in April 2011 on the "Developer English" and showing my non-developer audience, mostly English teachers, various diagrams to explain how developers see their industry etc. One of these diagrams is "Hot Technologies", basically, if you want to become a developer, what technologies should you learn to have the highest chance of (1) getting a job (2) making a good salary, and (3) work with the most exciting technology. This is a draft I made just to get some ideas out, basically C#, PHP, Java are where the bulk of the jobs are. Mobile development has a big future. JavaScript is becoming more and more important, and I want to list "minor technologies" such a Python, Ruby on Rails to the side, I assume e.g. that in general, there are a much smaller percentage of jobs in these technologies as in C#, PHP, Java. How could this diagram be improved?

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  • Amazon how does their remarkable search work?

    - by JonH
    We are working on a fairly large CRM system /knowledge management system in asp.net. The db is SQL server and is growing in size based on all the various relationships. Upper management keeps asking us to implement search much like amazon does. Right from there search you can specify to search certain objects like outdoor equipment, clothing, etc. and you can even select all. I keep mentioning to upper management that we need to define the various fields to search on. Their response is all fields...they probably look at the search and assume that it is so simple. I'm the guy who has to say hold on guys we are talking about amazon here. My question is how can amazon run a search on an "all" category. Also one of the things management here likes is the dynamic filters. For instance, searching robot brings up filters specific to a robot toy. How can I put management in check and at least come up with search functionality that works like amazon. We are using asp.net, SQL server 2008 and jquery.

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  • Rock Stars and now OPN All-Stars? Bring it.

    - by sandra.haan
    We are talking everything OPN All-Star - from home-court advantage to taking too many shots across a wide variety of industries, skill sets, focus areas, broad solution sets, applications and technologies. As a Platinum Partner, Intelenex levels of quality specialization range from ERP/EBS, CRM, AIA to Hyperion. Slam dunk! This is what gives Intelenex a well deserved star studded "baller" celebrity status like the LA Lakers very own Kobe Bryant. While Intelenex has been busy multi-specializing and taking names, Tyler Prince, group vp, North America Sales tells us a little bit about the value OPN's overall strategy brings to the table. This exclusive partnership allows OPN Specialized partners to provide customers with a solution that helps them adapt swiftly to new expansion conditions and changes. Namely, partners can pick an area to focus and can leverage that focus and competency to differentiate from the competition. You will be so HOT on the OPN court the Miami Heat will have nothing on you. Watch out, Lebron. Additionally, this specialization in products or set of products is recognized by the entire Oracle sales force, which is vital to all partners, but most importantly your end-customers. You will be so stylishly famous your cheerleader squad will not be able to steal the spotlight from you. Are you really All-Star worthy this season? Jump in and join Tyler's halftime report on OPN's All-Star program in this VAR Guy FastChat video to find out: Now that's what we call some March Madness - Good selling, The OPN Communications Team

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