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• What makes an application memory bandwidth bound?

  - by TheLQ

  This has been something that's been bothering me for a while: What makes an application memory bandwidth bound? For example, take this monstrosity of a computer that calculated the 5 trillionth digit of pi (and later 10 trillionth digit). I was surprised that they choose the lower but faster 98 GB RAM at 1066 MHz instead of the larger but slower 144 GB at 800 MHz. This is especially surprising considering they are using 22 TB HD array to store the results from computation; more RAM means less need for hard drives. Maybe its because I don't write applications for HPC servers, but how would RAM be the bottleneck? Are there any other non-HPC applications that usually run into this problem?

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• Cannot type '^' (caret) in native KDE apps

  - by nebukadnezzar

  I cannot type the caret character '^' in native KDE apps, such as plasmoids, editors (Kate, KWrite), etc. It worked in previous (older) versions of KDE (3.5, I think). I believe it may be related to the fact that I'm using a keyboard with a german layout, however, it would seem farfetched - I can type the caret character just fine in non-KDE apps (such as chrome, firefox, etc). I tried switching keyboard layouts, but no cigar. What's going on? What do I have to change to get the caret character back?

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• Android 4.1 : la preview du SDK disponible, "Jelly Bean" se dévoile au Google I/O

  Android 4.1 débarque au Google I/O 2012 Jelly Bean intègre un search optimisé, la preview du SDK est disponible Une petite demi-heure avant l'ouverture du Google I/O, la grande conférence annuelle de Google dédiée aux développeurs, une des rumeurs persistantes était confirmée : il y aura bien une tablette Nexus 7, sous la marque Google, avec un écran 7'' et sous Jelly Bean. Restait à savoir ce que ce Jelly Bean allait proposer. Première information, le numéro de version. Il s'agit bien d'Android 4.1 (et non pas 5.0). Au fil des nombreux intervenants qui se succèdent sur la scène de San Francisco, la liste des améliorations s'allongent mais avec toujours en su...

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• Is 301 redirect sufficient to solve WWW and HTTP/S duplication?

  - by Thomas Ojo

  I was reading about this article - SEO preference for WWW or HTTP:// protocol redirection? Do www websites rank better than NON-www? I have same problem but I needed a help on this further. What about https:// How will this be treated? Is the redirect 301 sufficient to solve the problem? I have a SEO company that says if possible, i should not have redirect but I don't think this is visible? Does permanent redirect in any way have effect on SEO services if properly done?

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• How are vertex shader outs sent as inputs to the fragment shader?

  - by Jeffrey

  I'm learning some OpenGL 3.2 way of doing things and I think it's quite great, I'm actually understanding more of shaders and non-fixed pipeline in 1 week rather than those 2 years I tried to learn OpenGL fixed pipeline functions. But here's my question: From what I think I've understood the vertex shader is run for each vertexes in the VBO. But the fragments shader is run per each pixel (is that right?) which is a huge number compared to let's say 3 vertexes of a triangle. Now it seems that in the vertex shader the out variables (like colors and stuff) are passed 1 to 1 to the fragment shader. But let's say that I pass to the fragment shader the position of the vertex in the vertex shader. How is all executed? What vertex (A, B or C of the hipothetical triangle) is passed per each fragment and why?

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• Opinion : les frameworks Web sont-ils une mauvaise idée ? Partagez-vous l'avis de ce développeur PHP ?

  Opinion : les framework web sont-ils synonymes du mal ? J'ai récemment remarqué que personne n'a pris de recul sur les frameworks dédiés au langage PHP. Ils sont utilisés partout, ils sont devenus critères numéro un dans les recrutements de projets, ils sont l'équivalent d'une mode, etc. Bref, le framework est devenu le crucifix du développeur web. Mais un framework, est-ce vraiment que du bien? Non. En rassemblant une certaine quantité d'information trouvée sur quelques débats à propos de ceux-ci, j'ai décidé d'exprimer mon opinion sur l'utilisation d'un framework. Je trouve qu'un framework peut s'avérer être au sens propre le synonyme du mal. Avons-nous des statistiques sur l'utilisation des framewor...

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• how to convince other we should move to hadoop?

  - by Ramy

  Everything I've read about Hadoop seems like exactly the technology we need to make our enterprise more scalable. We have terabytes of raw data that is in non-relational form (text files of some kind). We're quickly approaching the upper limits of what our centralized file server can handle and everyone is aware of this. Most people on the tech team, especially the more junior members of the tech team are all in favor of moving from the central file system to HDFS. The problem is, there is one key (most senior, etc.) member of the team who is resisting this change and every time Hadoop comes up, he tells us that we could simply add another file server and be in the clear. So, my question (and yes, it's really subjective, but I need more help with this than any of my other questions) is what steps can we take to get upper management to move forward with Hadoop despite the hesitation of one member of the team?

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• Ubuntu Variant / Linux Distros which uses least system resources (RAM, CPU)?

  - by elegantonyx

  I have a netbook (an older Asus EEEPC 1005HA) which I want to get rid of Windoze on (I like Windows, but I don't think it works well in a netbook environment). Basically, my question is which Ubuntu variant will use the least RAM and CPU running idle, and/or the same question except when running Firefox and Libreoffice Writer, say. I am also open to suggestions of non-Ubuntu Linux distros, but since this is AskUbuntu I thought the first question would be more appropriate. I have a disk drive which I can attach to the netbook, so it doesn't have to be a Ubuntu Variant / Linux Distro which solely boots from a USB drive. I have at my disposal: DVDs, DVD writer/ disk drive, 4gb flash drive, 8 gb flash drive I was thinking either Lubuntu or Archbang / Crunchbang but I would like some help from more knowledgable people Specs: Can't boot into it right now, but I think I have either Intel Atom N270 @1.60ghz OR Intel Atom N280 @1.66ghz (single core, I think) 2gb RAM 160 GB hard drive

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• PEX - are you licenced for it?

  - by TATWORTH

  There is an interesting artcile about PEX at http://blogs.msdn.com/b/ukmsdn/archive/2011/02/22/featured-article-pex-and-visual-studio.aspx PEX can be downloaded from http://research.microsoft.com/en-us/projects/pex/downloads.aspx The licence conditions are: "Pex and Moles are Power Tools available for commercial use for MSDN subscribers. Moles is also available separately for commercial use without requiring an MSDN subscription. Pex and Moles are also available for academic and non-commercial use." I note with interest that it is now available to MSDN subscribers. If I recall correctly it used to be only available to VS Team versions.

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• how to convince other we should move to hadoop?

  - by Ramy

  Everything I've read about Hadoop seems like exactly the technology we need to make our enterprise more scalable. We have terabytes of raw data that is in non-relational form (text files of some kind). We're quickly approaching the upper limits of what our centralized file server can handle and everyone is aware of this. Most people on the tech team, especially the more junior members of the tech team are all in favor of moving from the central file system to HDFS. The problem is, there is one key (most senior, etc.) member of the team who is resisting this change and every time Hadoop comes up, he tells us that we could simply add another file server and be in the clear. So, my question (and yes, it's really subjective, but I need more help with this than any of my other questions) is what steps can we take to get upper management to move forward with Hadoop despite the hesitation of one member of the team?

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• 2D Physics in a networked game (iOS)?

  - by Pedro

  I am researching the possibilities for a new iOS game. It's going to be a run-n-gun type platformer, and I'm looking into the possibility of co-op multiplayer. The game itself wouldn't be very physics intensive, there will most likely be 20-30 physics bodies at any given time. For the multiplayer, I think I would have one player "hosting" and up to 3 other connecting via the Internet. Here's my first question, are there any 2D physics engines that work over a network(preferably open source)? My second question, Does anyone have any thoughts on using a non-networked engine (like Box2D or Chipmunk) and adding the networking component? Since there would not be very much information sent, do you think it would cause a lot of lag?

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• How can I teleport seamlessly, without using interpolation?

  - by modchan

  I've been implementing Bukkit plugin for creating toggleable in-game warping areas that will teleport any catched entity to other similar area. I was going to implement concept of non-Euclidean maze using this plugin, but, unfortunately, I've discovered that doing Entity.teleport() causes client to interpolate movement while teleporting, so player slides towards target like Enderman and receives screen updates, so for a split second all underground stuff is visible. While for "just teleport me where I want" usage this is just fine, it ruins whole idea of seamless teleporting, as player can clearly see when transfer happened even without need to look at debug screen. Is there possibility to somehow disable interpolating while teleporting without modifying client, or maybe prevent client from updating screen while it's being teleported?

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• Why ~/.bash_profile is not getting sourced when opening a terminal in Ubuntu 11.04?

  - by Viriato

  Problem I have an Ubuntu 11.04 Virtual Machine and I wanted to set up my Java development environment. I did as follows sudo apt-get install openjdk-6-jdk Added the following entries to ~/.bash_profile export JAVA_HOME=/usr/lib/jvm/java-6-openjdk export PATH=$PATH:$JAVA_HOME/bin Save the changes and exit Open up a terminal again and typed the following echo $JAVA_HOME (blank) echo $PATH (displayed, but not the JAVA_HOME value) Nothing happened, like if the export of JAVA_HOME and it's addition to the PATH were never done. Solution I had to go to ~/.bashrc and add the following entry towards the end of file #Source bash_profile to set JAVA_HOME and add it to the PATH because for some reason is not being picked up . ~/.bash_profile Questions Why did I have to do that? I thought bash_profile, bash_login or profile in absence of those two get executed first before bashrc. Was in this case my terminal a non-login shell? If so, why when doing su after the terminal and putting the password it did not execute profile where I had also set the exports mentioned above?

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• Public versus private inheritance when some of the parent's methods need to be exposed?

  - by Vorac

  Public inheritance means that all fields from the base class retain their declared visibility, while private means that they are forced to 'private' within the derived class's scope. What should be done if some of the parent's members (say, methods) need to be publicly exposed? I can think of two solution. Public inheritance somewhat breaks encapsulation. Furthermore, when you need to find out where is the method foo() defined, one needs to look at a chain of base classes. Private inheritance solves these problems, but introduces burden to write wrappers (more text). Which might be a good thing in the line of verbosity, but makes changes of interfaces incredibly cumbersome. What considerations am I missing? What constraints on the type of project are important? How to choose between the two (I am not even mentioning 'protected')? Note that I am targeting non-virtual methods. There isn't such a discussion for virtual methods (or is there).

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• Setup suspend-on-lid-close/Fn+F4 outside of KDE/Gnome?

  - by maxschlepzig

  On current Ubuntu (10.04) suspend-on-lid/Fn+F4 only works if some powermanagement-applet of KDE/gnome is running. But what about suspend-to-lid if you are working on the console or using a non-bloated window-manager? What is the current mechanism to configure suspend-on-lid system wide? What of hald/udev/acpid/foo-kit/random-thing is the right place to hook this feature in? What is the up-to-date command to suspend from the command line/script? echo -n mem > /sys/power/state pm-suspend pmi or something else? Btw, if it matters, I want to configure it on some Thinkpads.

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• How should I synchronize configurations and data across computers?

  - by lfaraone

  Imagine I have three Ubuntu computers home, laptop, beach-house. They all have the same version of Ubuntu, 10.04 installed, and are kept up to date from the repositories. I use f-spot, thunderbird, and google-chrome on all of the computers. Is there a way to keep the data and configuration in sync across them, without requiring constant connectivity for normal (non-synchronous) usage? For example, they should be usable without network connectivity, so something like NFS won't work. An ideal solution would not require manual action to start the syncing process.

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• Application menu only on maximised windows?

  - by Echogene

  I know that there is a way to disable global menu. I don't quite want this as I quite like (at least one thing about) global menu. I would like to know if there is a way of disabling global menu for non-maximised windows. Thus I ask: is this possible and if so, how is it done?To me, the menu bar/global menu should be visually a part of the window since it is a part of the program and the window is meant to encapsulate the program. Global menu is only visually a part of a window when the window is maximised and merged with the top bar. I don't like bits of my windows floating all around the screen. You wouldn't drive a car when the driver's seat is on the roof of your house.

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• Cannot authenticate without a password

  - by user70267

  This question has been asked hundreds of times before, but I did not see any relevant answer so I will repost. Sorry if there is any helpful answer, please don't vote down but please link to the question(s) with such answers. The problem can be reproduced as follows: When I remove the password of an administrator account, "Log In without Password", I cannot use that account to authenticate. When I do something that requires authentication, I cannot use an admin without a password to authenticate. If I leave the password box blank without a password while choosing a non-password admin, authentication fails (in terminal or in GUI). How to fix this problem?

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• Add References with Search

  - by Daniel Cazzulino

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

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• When is using stdio preferable to fstream?

  - by Karl Bielefeldt

  I work on a well-established, embedded C++ code base. We have been using a proprietary API to our filesystem. For better integration with third-party C libraries, we are currently in the process of implementing most of stdio.h and fcntl.h. I made what I thought was a non-controversial proposal that we should also implement the fstream class and encourage new C++ code to use it instead of the new (to our code base) C-style API. We already have the stdout parts of iostream available, although it is not widely used. Given a choice between using stdio and fstream, what are good reasons to choose stdio for embedded software development in C++?

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• I'm the .1x programmer at my company. How can I best contribute?

  - by invaliduser

  I work at a newly-minted startup of five people. We have a Ph. D in machine learning, a former member of the RSpec core team, and the guy who compiles the Git binary for OS X. That's just the employees; the founder has a Ph. D and was CTO for a multi-billion-dollar corporation before leaving to start a (successful) startup, and has now left that to start this one. We also might get a guy with a Ph. D in math. Aaaaaaaaand then there's me, college-dropout intern. I think I'm pretty smart and I'm reading non-stop, but the delta of experience, skill, and knowledge between me and my co-workers is just breathtaking. So put yourself in their shoes: you've got a bright young intern who has a lot to learn but is at least energetic. What would be annoying? What use would you hope to get out of him in the here and now? What would be pleasantly surprising if it happened?

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• How to include content from remote server while keeping that content secure

  - by slayton

  I am hosting collection of videos, for which I retain the copyright, on a file server that I'd like to share with family and friends. When a user visits the my fileserver via a web browser they are asked to authenticate using HTTP auth and then they are presented with a basic list of the files. I'd like to build web application that provides a clean interface with simply library functionality. However, this app will be hosted on a different server. I'm trying to figure out a security model for my file server that doesn't require the user to login to both the file-server and the hosting-server. I want to make this as easy as possible for my non-tech savy family while still maintaining security for my files.

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• What effect does using itemprop="significantLinks" on anchors have for SEO?

  - by hdavis84

  So as I've described in a previous post about span tags within head tags, I'm practicing application of microdata via http://schema.org. Anyone who's browsed the documentation there knows that there's a lot of need for improvement for more clear understandings on use for each property. My question on this post is more about the "significantLinks" property and how it effects SEO for on page, in content anchored text. Does anyone have any more information regarding whether its good to use for link optimization? I understand what schema.org means that it's to be used on "non-navigational links" and those links should be relevant to the current page's meaning. But will using this property hurt SEO or make SEO better for each page? Thanks in advance, as by answering this with accurate information you are helping not just me, but many people who are trying to make their customers more successful through helping their rank for relevant keywords to their business, bringing them more search engine traffic.

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• What is the most serious limitation of Unity?

  - by ashes999

  Having read this heated question about Unity vs. UDK vs. ID something, I'm curious to know: what the repeatedly-hit, most crippling limitation(s) of Unity? In order to keep this question non-subjective, again, I'm talking about the top repeated offender(s) of Unity are. This is something that, as a Unity user, you really wish someone had told you about before you started using it. I have heard from someone that Unity does not deal well with version control, since it generates a lot of binary files (which are un-diffable). This, to me, is not really crippling as I work alone. Thoughts?

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• Where does ntpdate get its settings from and what is the "no servers can be used" error about?

  - by wilhil

  When I run ntpdate on its own, I get the following output: 8 Jun 15:47:46 ntpdate[31251]: no servers can be used, exiting If I run it with the -q ntp.ubuntu.com switch, it seems to query just fine. I have been hunting through many files and the most relevant one I have found is /etc/default/ntpdate, however, even with NTPDATE_USE_CONF set to no, I just can't understand/see how this error is occurring Any ideas? Update-- been looking non stop... It appears that ntupdate-debianworks fine and is the actual command that makes use of /etc/default/ntupdate, but, this doesn't answer the main question and I still can't find it...

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