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• Parallelism implies concurrency but not the other way round right?

  - by Cedric Martin

  I often read that parallelism and concurrency are different things. Very often the answerers/commenters go as far as writing that they're two entirely different things. Yet in my view they're related but I'd like some clarification on that. For example if I'm on a multi-core CPU and manage to divide the computation into x smaller computation (say using fork/join) each running in its own thread, I'll have a program that is both doing parallel computation (because supposedly at any point in time several threads are going to run on several cores) and being concurrent right? While if I'm simply using, say, Java and dealing with UI events and repaints on the Event Dispatch Thread plus running the only thread I created myself, I'll have a program that is concurrent (EDT + GC thread + my main thread etc.) but not parallel. I'd like to know if I'm getting this right and if parallelism (on a "single but multi-cores" system) always implies concurrency or not? Also, are multi-threaded programs running on multi-cores CPU but where the different threads are doing totally different computation considered to be using "parallelism"?

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• Latest Ubuntu 13: Can't add more than four keyboard layouts

  - by Woofi Alakhi

  Yes, I read this article. But my questions are: I would like to try this, but I see they've written there something with "gnome" in the script. In my Ubuntu, 13.04, I have Unity. What do I do? I would have to do this for four x four keyboard layouts (to have 13 keyboard layouts). Your script, however, is designed for two x four keyboard layouts. How do I get the four x four? I would really appreciate your tips and hints on this. And I would kindly ask you to keep it simple, if possible, because I'm really no expert in both Ubuntu and computers in general.

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• Comparing Checksums

  - by Sean Feldman

  This is something trivial, yet got me to think for a little. I had two checksums, one received from a client invoking a service, another one calculated once data sent into service is received. Checksums are plain arrays of bytes. I wanted to have comparison to be expressed as simple as possible. Quick google search brought me to a post that dealt with the same issue. But linq expression was too chatty and I think the solution was a bit muddy. So I looked a bit more into linq options presented in the post, and this is what ended up using: var matching = original_checksum.SequenceEqual(new_checksum); Sometimes things are so simple, we tend to overcomplicate them.

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• Sample Code and Slides from DevConnection Germany

  - by Stephen Walther

  Thank you everyone who came to my three talks this week at DevConnections Germany!  I really enjoyed my time in Karlsruhe. Here are the slides and sample code for the three talks:   jQuery Templates In this talk, I discuss how you can take advantage of jQuery templates when building both ASP.NET Web Forms and ASP.NET MVC applications. I demonstrate several advanced features of templates such as wrapped templates and remote templates. Download the slides Download the code   HTML5 In this talk, I discuss the features of HTML5 which matter most when building database-driven web applications. I demonstrate WebSockets, Web Workers, Web Storage, IndexedDB, and Offline Web Applications. Download the slides Download the code   jQuery + OData In this talk, I demonstrate how you can build entire web applications by taking advantage of jQuery and OData. I demonstrate how you can use jQuery and OData to both query and update database data. I also discuss two approaches for supporting validation. Download the slides Download the code

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• Error occurred in deployment step 'Activate Features': The field with Id {GUID} defined in feature {GUID} was found in the current site collection or in a subsite.

  - by Jayant Sharma

  Hi all, In SharePoint 2010, This is rare error, I got when I deploy and activate Feature using VS2010. Deployment works file  but in activation process it get stuct and throws error. Error occurred in deployment step 'Activate Features': The field with Id {GUID} defined in feature {GUID} was found in the current site collection or in a subsite. When I googled I found very good solution  from Sandeep Snahta Blog. http://snahta.blogspot.hk/2011/10/error-in-activate-features-from-visual.html As suggested in this blog, there is two option to overcome this error; Close VS2010 and restart again. Or Kill VSSHost4 Process either through Task Manager or Via Power Shell Command    stop-process -processname vssphost4 -force   Jayant Sharma

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• How To Make FileZilla Open All The Required Files With One Click

  - by Omar Tariq

  Is there any way of configuring FileZilla so that I can open all the files on a server that I use to edit with just one click. For example if the files are like this:- /home/abc/def/one.txt /home/abc/def/yet/another/directory/two.txt /home/abc/def/ghi/yet/another/directory/three.txt then it is very time-consuming to navigate through each directory and open the required files. These are only 3 files but what if we have around 10 to 20 files? Yes, copying the path of the directories is one thing. But something that is built-in so that I can just click a button like open all the required files of this connection and it opens all the files in the editor (as set in FileZilla preferences) then that would be great!

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• Qt question: hard-coded shortcuts

  - by miLo

  I have asked this question on several places but I still can't figure it out. What I am trying to do is to have a QKeySequence(Qt::CTRL + Qt::Key_X, Qt::CTRL + Qt::Key_C) in a MainWindow with QTextEdit as a central widget. The problem is that I have a shorcut for Cut(Ctrl+X) and when I press Ctrl+X,Ctrl+C it doesn't work. When the focus is on diffrent widget the shorcut works perfectly. I tried with overriding the QWidget::keyPressEvent and QWidget::event but it is the same. I have one more question: if I have these two shorcuts Ctrl+X and Ctrl+XCtrl+C why I don't receive the signal activatedAmbigiously() when I press Ctrl+X? According to the Qt documentation When a key sequence is being typed at the keyboard, it is said to be ambiguous as long as it matches the start of more than one shortcut.

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• Should I use title case in URLs?

  - by Amadiere

  We are currently deciding on a consistent naming convention across a site with multiple web applications. Historically, I've been an advocate of the 'lowercase all the letters!' when creating URLs: http://example.com/mysystem/account/view/1551 However, within the last year or two, specifically since I began using ASP.NET MVC & had more dealings with REST based URLs, I've become a fan of capitalizing the first letter of each section/word within the URL as it makes it easier to read (imho). http://example.com/MySystem/Account/View/1551 We're not in a situation where people need to read or be able to understand the URLs, so that's not a driver per se. The main thing we are after is a consistent approach that is rational and makes sense. Are there any standards that declare it good to do one way or another, or issues that we may run into on (at least realistically modern) setups that would choose a preference over another? What is the general consensus for this debate currently?

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• Oracle University Partner Enablement Update (19th March)

  - by swalker

  Java SE 7 Certification News The following exam has recently gone into Production: Exam Title and Code Certification Track Upgrade to Java SE 7 Programmer (1Z0-805) Oracle Certified Professional, Java SE 7 Programmer Full preparation details are available on the exam page, including prerequisites for this certification, exam topics and pricing. Exams can be taken at an Oracle Test Center near you or at any Pearson VUE Testing Center. The following exam has recently become available for beta testing: Exam Code and Title Certification Track Java SE 7 Programmer II (1Z1-804) Oracle Certified Professional, Java SE 7 Programmer Full preparation details are available on the exam page, including prerequisites for this certification, exam topics and pricing. A beta exam offers you two distinct advantages: you will be one of the first to get certified you pay a lower price. Beta exams can be taken at any Pearson VUE Testing Center. Stay Connected to Oracle University: LinkedIn OracleMix Twitter Facebook

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• How to use Google Analytics to track a development and production versions of the same site on different servers?

  - by Abe

  I have a website with two versions, one for production and one for development (testing new features). All of the code is under version control and the websites are on separate servers. Currently, I have the same Google Analytics Tracking code used on both sites. Since the code is under version control, it would be ideal to either have an if I am on production, use this code; else if on development server use that code clause. But I suspect that Google makes it easier to do something like this. I see that there are many ways to configure a GA tracking code, e.g. "a single domain" vs. "multiple top level domains". But it is not clear to me how to set this up. Also, if tracking code configured for a single domain has been on the development server, have I been picking up traffic to both sites, or does GA just ignore the second domain that I haven't registered?

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• Rebind Alt key to win using setxkbmap?

  - by Wayne Werner

  Hi, After an hour or two of manpage and Google searching and finding no solution or good resources, I've come for help! I have set my Caps Lock key to Ctrl using setxkbmap -option ctrl:nocaps - this works perfectly fine. However, since I use [awesome][1], and an IBM model M which lacks the meta key, I need my left alt key to replace the windows key. Using xkeycaps I was able to get this to work, except it killed my arrow keys and End. Problematic. Unfortunately, documentation on setxkbmap options are sparse. and I can't find the proper option to use. Thanks for any links/solutions.

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• Ubuntu 12.04 installer Crashed

  - by Umair Mustafa

  I downloaded Multiple times Ubuntu 12.04 and Ubuntu 12.04.1. And tried to install them using first Virtual box if it work I move to install on actual drive. I dont knw but 12.04.1 dont wanna install on my system So i downloaded 12.04 release and installed it on Virtual box and it installed perfectly then i moved on to install it as Dual OS along with windows 7 but the installer crashed just like the other version and I dont know what the heck is the problem with ubuntu OS Installers. Ubuntu really need to work on their Installer. I love Ubuntu but such things are really headache. At first I thought image was not properly so i burned on another dvd but alas no use same stupid error. Now there are 3 images of 12.04 and 2 images of 12.04.1 and none of them is working on my system. And wasted two dvds. Does anyone know how to solve this problemo.

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• What are the advantages and challenges of using HaXe over ActionScript 3?

  - by Arthur Wulf White

  I read this: http://webr3.org/blog/haxe/bitmapdata-vectors-bytearrays-and-optimization/ And this: http://stackoverflow.com/questions/5220045/what-are-the-pro-and-cons-of-using-haxe-over-actionscript-3 http://www.haxenme.org/developers/documentation/actionscript-developers/ I read there are only two books, is that right? http://haxe.org/doc/book I also see that using FlashDevelop you can make an Adobe Air project with HaXe and compile to exe. And begun to wonder from a game making perspective: I saw the example in the first link, are there any additional advantages in performance when using HaXe instead of AS3 for games development (for the web)?

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• How to Customize Fonts and Colors for Gnome Panels in Ubuntu Linux

  - by The Geek

  Earlier this week we showed you how to make the Gnome Panels totally transparent, but you really need some customized fonts and colors to make the effect work better. Here’s how to do it. This article is the first part of a multi-part series on how to customize the Ubuntu desktop, written by How-To Geek reader and ubergeek, Omar Hafiz. Changing the Gnome Colors the Easy Way You’ll first need to install Gnome Color Chooser which is available in the default repositories (the package name is gnome-color-chooser). Then go to System > Preferences > Gnome Color Chooser to launch the program. When you see all these tabs you immediately know that Gnome Color Chooser does not only change the font color of the panel, but also the color of the fonts all over Ubuntu, desktop icons, and many other things as well. Now switch to the panel tab, here you can control every thing about your panels. You can change font, font color, background and background color of the panels and start menus. Tick the “Normal” option and choose the color you want for the panel font. If you want you can change the hover color of the buttons on the panel by too. A little below the color option is the font options, this includes the font, font size, and the X and Y positioning of the font. The first two options are pretty straight forward, they change the typeface and the size. The X-Padding and Y-Padding may confuse you but they are interesting, they may give a nice look for your panels by increasing the space between items on your panel like this: X-Padding:   Y-Padding:   The bottom half of the window controls the look of your start menus which is the Applications, Places, and Systems menus. You can customize them just the way you did with the panel.   Alright, this was the easy way to change the font of your panels. Changing the Gnome Theme Colors the Command-Line Way The other hard (not so hard really) way will be changing the configuration files that tell your panel how it should look like. In your Home Folder, press Ctrl+H to show the hidden files, now find the file “.gtkrc-2.0”, open it and insert this line in it. If there are any other lines in the file leave them intact. include “/home/<username>/.gnome2/panel-fontrc” Don’t forget to replace the <user_name> with you user account name. When done close and save the file. Now navigate the folder “.gnome2” from your Home Folder and create a new file and name it “panel-fontrc”. Open the file you just created with a text editor and paste the following in it: style “my_color”{fg[NORMAL] = “#FF0000”}widget “*PanelWidget*” style “my_color”widget “*PanelApplet*” style “my_color” This text will make the font red. If you want other colors you’ll need to replace the Hex value/HTML Notation (in this case #FF0000) with the value of the color you want. To get the hex value you can use GIMP, Gcolor2 witch is available in the default repositories or you can right-click on your panel > Properties > Background tab then click to choose the color you want and copy the Hex value. Don’t change any other thing in the text. When done, save and close. Now press Alt+F2 and enter “killall gnome-panel” to force it to restart or you can log out and login again. Most of you will prefer the first way of changing the font and color for it’s ease of applying and because it gives you much more options but, some may not have the ability/will to download and install a new program on their machine or have reasons of their own for not to using it, that’s why we provided the two way. Latest Features How-To Geek ETC How to Enable User-Specific Wireless Networks in Windows 7 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) How To Remove People and Objects From Photographs In Photoshop Ask How-To Geek: How Can I Monitor My Bandwidth Usage? Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Here’s a Super Simple Trick to Defeating Fake Anti-Virus Malware The Splendiferous Array of Culinary Tools [Infographic] Add a Real-Time Earth Wallpaper App to Ubuntu with xplanetFX The Citroen GT – An Awesome Video Game Car Brought to Life [Video] Final Man vs. Machine Round of Jeopardy Unfolds; Watson Dominates Give Chromium-Based Browser Desktop Notifications a Native System Look in Ubuntu Chrome Time Track Is a Simple Task Time Tracker

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• Download the Official How-To Geek Trivia App for Windows 8

  - by The Geek

  The new How-To Geek Trivia application has just been approved in the Windows 8 store, so if you’re already running the release preview you can go and download it right now for free. It’ll give you a daily dose of geeky trivia right on your Windows 8 desktop. Click Here to Download Geek Trivia for Windows 8 Each trivia question will present you with the question, and then once you answer, will show you whether you picked the right one as well as the full description. How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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• Why are 2 Adobe Flash Plugin on USC (Ubuntu Software Center)?

  - by LuC1F3R

  As you know in Ubuntu Software Center is 2 times Adobe Flash Plugin. One is called Adobe Flash Plugin and other Adobe Flash Plugin 10. Which of the two to install? Or rather it is the recommended installation methods? If we think well, we can install the Adobe Flash plugin for Firefox from the notification date (Install missing plugin) or walking on the Adobe website and downloading the package .deb. After all, how to properly install Flash Player on Linux Ubuntu? (But my biggg question is why are 2 Adobe Flash Plugin on USC? ...for what? If you click on "More Info", the description are the same for both)

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• Cannot access system after deleting passwd file

  - by joao rodrigo leao

  I was trying to change my user name and also my /home/username and my system started to crash. I deleted the passwd file but I had a backup named passwd_bkp. I tried to rename this passwd_bkp as passwd and it did not work. No commands were being executed... I was in a terminal window. I re-started my system and now I cannot login. The GRub loads two options: Linux and recovery mode. I tried to open a sessions as root but it says the file system is corrupted. I cannot access my files. Did I lose all my files?

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• May I make an installer bundle GPL and payware together?

  - by Volomike

  I have an affiliate marketing client who needs to know if I can program this. Can I do one or both of the following scenarios without violating the GPL license? Scenario A: Make a software installer for a GPL licensed product which includes source, binaries, and license info. The installer also has a checkbox for installing optional software that's payware. (In this case, the payware is free crippleware, but has a registration upsell to provide more features.) The two products will not share libraries or anything else. Scenario B: Same as A, but reversed. So, the installer installs the payware, but there's a checkbox to also install the GPL software. And, again, when you install the GPL software, it comes with binaries, source, and license info.

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• IL and case-sensitivity

  - by Ali .NET

  Quoted from A Brief Introduction To IL code, CLR, CTS, CLS and JIT In .NET CLS stands for Common Language Specifications. It is a subset of CTS. CLS is a set of rules or guidelines which if followed ensures that code written in one .NET language can be used by another .NET language. For example one rule is that we cannot have member functions with same name with case difference only i.e we should not have add() and Add(). This may work in C# because it is case-sensitive but if try to use that C# code in VB.NET, it is not possible because VB.NET is not case-sensitive. Based on above text I want to confirm two points here: Does the case-sensitivity of IL is a condition for member functions only, and not for member properties? Is it true that C# wouldn't be inter-operable with VB.NET if it didn't take care of the case sensitivity?

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• What tools to use for efficient link building?

  - by Evgeny

  As most SEO experts keep saying, it is not just the content that you have - but also a hefty amount of quality incoming links to your content that is important -- these are the two ways to get to the top of the search results. The question is where do I find the incomnig links? One way I know is Google Blog Search, it can be used to find blogs with related information to your content and some allow to leave comments. The comments usually consist of your name, e-mail and website. If you put your keyword instead of your name, then the keyword turns into a link to your website. Unfortunately most blogs put rel=nofollow on such links, but some blogs don't do that. What other ways are there to find quality pages to put keywords links back to your website? Quality link usually means: located on a page with relevant content does not have a rel=nofollow in the <a has a relevant keyword as in <a href=websitekeyword</a the page with the link has high PageRank (3+) and TrustRank

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• How to update a game off a database

  - by James Clifton

  I am currently writing a sports strategy management game (cricket) in PHP, with a MYSQL database, and I have come across one stumbling block - how do I update games where neither player is online? Cricket is a game played between two players, and when they (or one of them) is online then everything is fine; but what if neither player is online? This occurs when championship games are played, and these games need to happen at certain times for game reasons. At the moment I have a private web page that updates every 5 seconds, and each time it loads all games are updated; but then I have the problem that when my private web page stops (for example my computer crashes or my web browser plays up) the game stops updating! Any suggestions?

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• Simplified knapsack in PHP

  - by Mikhail

  I have two instances where I'd like to display information in a "justified" alignment - but I don't care if the values are switched in order. One example being displaying the usernames of people online: Anton Brother68 Commissar Dougheater Elflord Foobar Goop Hoo Iee Joo Rearranging them we could get exactly 22 characters long on each line: Anton Brother68 Foobar Commissar Elflord Goop Dougheater Hoo Iee Joo This is kind of a knapsack, except seems like there ought to be a P solution since I don't care about perfection, and I have multiple lines. Second instance is identical, except instead of names and character count I would be displaying random images and use their width.

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• Correct definition of the term "Yak Shaving"

  - by StevenWilkins

  The wiktionary has two different definitions: Any apparently useless activity which, by allowing you to overcome intermediate difficulties, allows you to solve a larger problem. The actually useless activity you do that appears important when you are consciously or unconsciously procrastinating about a larger problem. This post defines it as: yak shaving is what you are doing when you're doing some stupid, fiddly little task that bears no obvious relationship to what you're supposed to be working on, but yet a chain of twelve causal relations links what you're doing to the original meta-task. I personally prefer the final definition because it contains the word "fiddly" which I think perfectly describes a typical yak shaving task. What is the best definition you've come across or can provide?

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• Is there a LibreOffice equivalent to microsofts office themes?

  - by Dr. Mike

  I've used MS office for many years now. Especially powerpoint. One of the strengths is that it defines and separates the concepts of template and theme. A theme can be saved and contains fonts, colours, and a set of images that can be reused every time you create a new presentation. This ensures that everyone in your organization uses exactly the same colours and fonts all the time. Now I know that you can download templates for LibreOffice, but I have not seen anything similar to the theme concept. The file extensions used in MS office are the following for the two concepts mentioned: Example Powerpoint template file name: mytemplate.potx Example Powerpoint theme file name: mytheme.thmx Now back to my question: Do these concepts and their separation exist in LibreOffice or OpenOffice? If so, how do I create them?

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• Slow Motion Egg Destruction [Video]

  - by Jason Fitzpatrick

  We’ve said it before and we’ll say it again: everything is better in slow motion. In this instance it’s twenty two eggs made interesting by meeting their demise in a variety of ways. Of all the egg smashes in the video, we’re particularly fond of the tennis racket segment. Have a cool slow-mo video to share? Throw a link in the comments! Slo-As-A-Mofo-Sho – Egg Destruction [via Boing Boing] How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary 6 Ways Windows 8 Is More Secure Than Windows 7

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