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• Why are there different programming languages [closed]

  - by Velizar Hristov

  I'm not asking about the usefulness of the languages that do exist already: I already know, and agree, that different languages are better for different purposes. However, why don't they just have a single language that can do it all? Why, when C# was created, they didn't keep everything from C and C++ and just add a few things, so that it can be used as both a low-level and high-level language? I see no harm in adding all kinds of commands to a single language that would allow it to be good for everything, and even eliminate the need for all other languages. Someone from another thread said that if there's a flaw in a certain language, its successor might not have it. However, why don't we just update that language to remove the flaw, and/or add anything that's missing? Arrays are different in Java and C#, but why not have them both, just use different commands for them? And so on...

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• uswsusp won't hibernate with freeplane and some websites open

  - by Richard

  I installed uswsusp on my laptop to hibernate faster, which works most of the time, but whenever I have freeplane (and some websites in firefox...can't recall which ones but can probably find some) it fails. In order to hibernate, I have to resort to closing the offending program or webpage - but this kinda ruins the point of hibernating... It fails when I try sudo s2disk in a terminal with freeplane open, but strangely works with sudo s2ram --force. When it fails, it simply switches to the black screen with s2disk: Snapshotting system but then returns to the login screen. When I enter my password, the hibernating indicator continues flashing but goes back to the desktop I left when trying to hibernate. When it works, it works as expected from hibernate, shutdown and resume. I saw another thread discuss fglrx modules and to include it in MODULE="fglrx" in /etc/default/acpi-support, but that hasn't helped me. I'm using Ubuntu 11.10 with an ATI graphics card on an Acer Aspire 6920.

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• Internet Connection Problems

  - by Confused One

  I just installed Ubuntu 11.04 onto a laptop. There is no list of automatic connections when I click on the internet connection symbol. Enable Wireless was unchecked, so I checked it. However, it continues saying "wireless is disabled." Soft is blocked, and when I tried rfkill unblock wifi it told me that the device was not ready. I tried to counter this with what I found on this thread but nothing worked. I have tried manually entering my Wireless information, but this does not help. Is there a solution?

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• Redirect packages directed to port 5000 to another port

  - by tdc

  I'm trying to use eboard to connect to the FICS servers (http://www.freechess.org), but it fails because port 5000 is blocked (company firewall). However, I can connect to the server through the telnet port (23): telnet freechess.org 23 (succeeds) telnet freechess.org 5000 (fails) Unfortunately the port number is hardcoded (see here: http://ubuntuforums.org/archive/index.php/t-1613075.html). I'd rather not have to hack the source code as the author of that thread ended up doing. Can I just forward the port on my local machine using iptables? I tried: sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 5000 -j REDIRECT --to-port 23 and sudo iptables -t nat -I OUTPUT --src 0/0 -p tcp --dport 5000 -j REDIRECT --to-ports 23 but these didn't work... Note that: $ sudo iptables -t nat -L Chain PREROUTING (policy ACCEPT) target prot opt source destination REDIRECT tcp -- anywhere anywhere tcp dpt:5000 redir ports 23 Chain INPUT (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination REDIRECT tcp -- anywhere anywhere tcp dpt:5000 redir ports 23 Chain POSTROUTING (policy ACCEPT) target prot opt source destination

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• Which parallel pattern to use?

  - by Wim Van Houts

  I need to write a server application that fetches mails from different mail servers/mailboxes and then needs to process/analyze these mails. Traditionally, I would do this multi-threaded, launching a thread for fetching mails (or maybe one per mailbox) and then process the mails. We are moving more and more to servers where we have 8+ cores, so I would like to make use of these cores as much as possible (and not use 1 at 100% and leave the seven others untouched). So conceptually, as an example, it would be nice that I could write the application in such a way that two cores are "continuously" fetching emails and four cores are "continuously" processing/analyzing the emails (since processing and analyzing mails is more CPU intensive than fetching mails). This seems like a good concept, but after studying some parallel patterns, I'm not really sure how this is best implemented. None of the patterns really fit. I'm working in VS2012, native C++, but I guess from a design point of view this does not really matter and just some pointers on how to organize this would be great!

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• What's a good open source cloud computing software? [closed]

  - by boy

  In particular, the "cloud" computing that I'm referring to is: I'm going to get some Linux servers. Then I have pretty big computing tasks to do every day. So my goal is to be able to run some shell command to request an "instance" (ie, if a server has 4 CPU, then the computing software will configure that server to have 4 instances, assuming all my tasks are single thread). Ideally, then I can run the following command: ./addjobs somebatchfile where somebatch file contains one command per line ./removejobs all ./listalljobs (ie, everything is done in shell. And the "computing software" can return me the hostname that's available in some environment variable, etc) And that's all I needed. I run into OpenStack.. but it seems too complicated for this purpose (ie, it does all the Imagine sharing stuff, etc).. All I want, is something SIMPLE that manages the Linux boxes for me and I'm just going to run shell commands on them... Is there such open source software? Thanks,

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• What stack of technologies should I use for my online game?

  - by Vee Bee

  I built a TicTacToe game to learn the .Net MVC3 framework. The basic functionality works (display board, make a move, detect winning move etc.) What I'd like to do is make it a "real" application - well-architected and using the right technology at the right layer. For instance, I'm currently saving every move to the database via a service call, which feels klugey and may become a bottleneck if this was an MMO game. How do you determine a good architecture (or right set of technologies) to use in a situation like this? I'd like to learn not just what to do, but why certain decisions are better than others. I noticed a similar thread here but it just offered opinions without explaining WHY something would be better (e.g. why Node instead of MVC3, etc.)

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• Are there any OpenGL ES 2.0 examples for JOGL?

  - by fjdutoit

  I've scoured the internet for the last few hours looking for an example of how to run even the most basic OpenGL ES 2 example using JOGL but "by Jupiter!" it has been a total fail. I tried converting the android example from the OpenGL ES 2.0 Programming Guide examples (and at the same time looking at the WebGL example -- which worked fine) yet without any success. Are there any examples out there? If anyone else wants some extra help regarding this question see this thread on the official Jogamp forum.

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• How Is there anyway to Compile Notepad++?

  - by user44179

  I really like using Notepad++ to write HTML and such. After I started using Ubuntu I looked around for an alternative to Notpad++. I found a thread which lead me to try Geany and a few others, but I really miss Notepad++. Is there anyway I could compile it from the source code to use on Ubuntu? I know its written in C++. Could I just open it in Code::Blocks and compile it? You can get the source here. I wouldn't mind hearing about other alternatives, but really want to know if compiling it is possible. Thanks

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• What good free forum engines are out there? [closed]

  - by user1306322

  I'm looking for a forum engine for my website, which will look modern, easy to use and follow lengthy discussions. Most of the times people hear "forum" they imagine unresponsive phpBB with terrible color scheme and unnecessarily huge user info sections (avatar, signature) about 600px high each, which make it impossible to see more than 5 posts on a really big screen. I'd like it to be the other way around with my future forum. Features I'd like to see: Clean, transparent section/thread selection, Must not have "message posted, you will be redirected to wherever" screens, 1-click message posting (captchas are ok, but not the ones that erase the whole post when you mistype), Tree hierarchy for comments to posts

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• Synchronise graphics and logic code

  - by Skeith

  I have a procedural approach to the game loop that runs various classes. it looks like this: continue any in progress animations check for used input apply AI move things resolve events such as collisions draw it all to screen I have seen a lot of posts about how drawing should be running separately as fast as it can, possibly in another thread. My problem is that if the drawing runs as fast as it, can what happens if it tried to draw while I'm still applying the AI or resolving a collision? It could draw the wrong thing on screen. This seems to be a well established idea so there must be an explanation to this problem as I just cant get my head around it. The only solution I have is to update the screen so fast that any errors like that get refreshed before we see them but that sounds hacky. So how does this work / how would you implement it so that they are in sync but running at different speeds?

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• SharePoint Search Problem: The start address sps3://server cannot be crawled.

  - by Clara Oscura

  With this post, I'm going to start a series on problems I have encountered with SharePoint search. Error: The start address sps3://luapp105 cannot be crawled. Context: Application 'Search_Service_Application', Catalog 'Portal_Content' Details:  Access is denied. Verify that either the Default Content Access Account has access to this repository, or add a crawl rule to crawl this repository. If the repository being crawled is a SharePoint repository, verify that the account you are using has "Full Read" permissions on the SharePoint Web Application being crawled.   (0x80041205) (Event ID: 14, Task Category: Gatherer) Solution: give appropriate permissions to User Profile Synchronisation Service http://social.technet.microsoft.com/Forums/en-US/sharepoint2010setup/thread/64cdf879-f01e-4595-bc52-15975fefd18d http://www.dotnetmafia.com/blogs/dotnettipoftheday/archive/2010/03/29/how-to-set-up-people-search-in-sharepoint-2010.aspx

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• I can not install Ubuntu 14.04 due to some problem?

  - by user285643

  I have installed Window 8.1 on my HP laptop.Now I want to install Ubuntu 14.04,I try to use "Wubi" but when I use it, after installation on window, when my computer restart i have a message "No root file system is defined" I have read some thread here and i got some solution. One of them are "I must format my partition again, using ext4 format and mount on it". I did it by using Gparted in Try Ubuntu mode, but I got another message "/dev/sda contains GPT signatures,indicating that it has a GPT table. However, it does not have a valid fake msdos partition table,as it should. Perhaps it was corrupted--possibly by a program that does not understand GPT partition table. Or perhaps you deleted the GPT table, and are now using msdos partition table. Is this a GPT partition table?"

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• Forum that integrates into CMS and has curated category pages with tagged threads

  - by user6172

  I'm looking for a forum that meets these requirements: Login using Facebook/Twitter/OpenID etc. User profiles with reward system Voting/thumbs up function Categories and tags for sorting threads Custom category pages with moderated static header Embeddable threads and categories (For example, a whole category or single thread can be integrated into wordpress) API to users, discussions etc. I've looked at forums like Vanilla, Disqus, OSQA etc, but none seem to match the above "hybrid criteria". Hosted or self-hosted doesn't matter but I'm really looking for something that can be integrated into an existing CMS to replace comments while at the same time have curated category pages and user profiles. Thanks.

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• Simplicity-effecincy tradeoff

  - by sarepta

  The CTO called to inform me of a new project and in the process told me that my code is weird. He explained that my colleagues find it difficult to understand due to the overly complex, often new concepts and technologies used, which they are not familiar with. He asked me to maintain a simple code base and to think of the others that will inherit my changes. I've put considerable time into mastering LINQ and thread-safe coding. However, others don't seem to care nor are impressed by anything other than their paycheck. Do I have to keep it simple (stupid), just because others are not familiar with best practices and efficient coding? Or should I continue to do what I find best and write code my way?

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• Is there a limit on the number of threads that can be spawned simultaneously?

  - by georgesl

  Yesterday I came across this question: How can i call robocopy within a python script to bulk copy multiple folders?, and I though it might be a good exercise for multithreading. I though of spawning as many threads as files needed to be copied, each routine having an exception handling system to prevent the whole copying process from crashing (and log -using mutex on the log file - if there was an error). My question: Is there a limit on the number of thread you can spawn almost simultaneously? If yes, what is the limiting factor? My question is focused on PC desktop, but I welcome any answer on different hardware (embedded systems, calculus clusters, etc.).

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• VMWare Player pauses often

  - by pascal

  I'm using a 64bit Windows 8 inside vmplayer, with 2 virtual processor cores, virtual hard disk resides on a fast local disc and is not preallocated; host CPU is Intel i7 3770, should be capable of hardware virtualisation but I don't know if VMWare uses it; NAT networking; Sound card connected, USB connected, accelerated 3D graphics (NVidia 313.30 on host) My problem is, that the VM often pauses for a few seconds, and then speeds up for a few seconds to reach real time again. Time in the VM actually moves faster after the pause, for example all animations using timers speed up. When running, the vmware-vmx process shows ~150% CPU usage in top, but 0% when pausing (and D state i.e. waiting for IO). iotop shows normal disk writes from vmware-vmx threads, but during pauses, the flush kernel thread uses 99%. Are there some options to try so that VMWare doesn't wait for IO? I've tried a few things available from the GUI but the issue never went away…

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• Box2D random crash when adding joints

  - by user46624

  I'm currently working on a project which uses Box2D, when the player uses a certain key it should anchor to the ground. For that I use a weld joint, but when I add the joint the game will sometimes crash, it has a 1/10 change to crash. The error I recieve: Showing the controller Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 11 at org.jbox2d.dynamics.Island.add(Island.java:577) at org.jbox2d.dynamics.World.solve(World.java:1073) at org.jbox2d.dynamics.World.step(World.java:598) The code for adding the joints: WeldJointDef def = new WeldJointDef(); def.initialize(body, anchoredObject.body, body.getWorldCenter()); weldJoint = (WeldJoint) world.createJoint(def); I still get the error if I synchronize it

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• OutOfBounds Exception when creating a PolygonShape using jbox2d

  - by B3nGr33ni3r

  So here's the deal, i'm parsing a file that contains the vertices for a polygon, that i want to create in box2d. I create a new PolygonShape() and then call .set() giving it a defined array of Vec, and that defined array's .length property. I expected this to work, since the documentation for jbox2d says this method takes a Vec array, and the count of Vec objects in that array. However, it errors out, and it seems to be unrelated to my code. The error i get is Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 8 at org.jbox2d.collision.shapes.PolygonShape.set(PolygonShape.java:174) and, upon looking at that line in the jbox2d svn repository, i still cannot figure out the issue. Any help is appreciated!

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• DevWeek 2010 is Coming Up

  The time has come again for the UK’s biggest conference for .NET developers and SQL Server professionals. The 13th annual DevWeek conference takes place on 15-19 March 2010 in London. Expert speakers will cover a large range topics, including .NET 4.0, Silverlight 3, WCF 4, Visual Studio 2010, Thread Synchronization, ASP.NET 4.0, SQL Server 2008 R2, Unit Testing, CLR & C# 4.0, Windows Azure, and T-SQL Tips & Tricks. Find out more. span.fullpost {display:none;}

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• Would you recommend to install libcupsys2_1.3.9-17ubuntu3.9_all.deb?

  - by NES

  Would you recommend to install libcupsys2_1.3.9-17ubuntu3.9_all.deb in Ubuntu 10.10? For getting my printer to work with Ubuntu 10.10 i've read many threads about a suggested workaround. there it's suggested to install libcupsys2_1.3.9-17ubuntu3.9_all.deb so that the canon driver should again do it's work with ubuntu. But i can't figure out what this package exactly is and like to understand what i do before i install it. in some thread they call it a dummy package, in others it's called a transitional package. However there should have been a reason why the ubuntu developers had deprecated libcupsys. So would you recommend it?

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• Google Chrome wont start after changing hostname

  - by user254473

  I tried to start google chrome in terminal several times, and I keep receiving the following message: ... :ERROR:process_singleton_linux.cc(309)] The profile appears to be in use by another Google Chrome process (8629) on another computer ("previous name of the computer"). Chrome has locked the profile so that it doesn't get corrupted. If you are sure no other processes are using this profile, you can unlock the profile and relaunch Chrome. ... :ERROR:simple_message_box_views.cc(208)] Unable to show a dialog outside the UI thread message loop: Google Chrome - The profile appears to be in use by another Google Chrome process (8629) on another computer ("previous name of the computer"). Chrome has locked the profile so that it doesn't get corrupted. If you are sure no other processes are using this profile, you can unlock the profile and relaunch Chrome. Any suggestions? Thanks in advance.

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• Dual monitor Unity launcher opening on wrong monitor in 11.10

  - by user26381

  I just upgraded to Oneiric and now the Unity Dash launcher is on my left screen. I really want it on my right screen. But how do I do that? Why do I want the Dash on my right screen? My left screen is a smaller older monitor that I use to read/watch documentation or keep my music player open. I work on my right screen, that is bigger and is a better monitor. I have an Nvidia card and in the nvidia settings it is setup that the right monitor is my primary monitor, but Oneiric doesn't follow this setting anymore. I thought this was a bug, but is seems to be intended behavior... https://bugs.launchpad.net/ubuntu/+source/unity/+bug/742544 Some poster in this thread explains that he "patched it locally", but I have no idea how to do this. Does somebody know how to do this? Or maybe there is another solution?

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• XNA VertexBuffer.SetData performance suggestions

  - by CodeSpeaker

  I have a 3d world in a grid layout where each grid cell contains its separate vertex and index buffer for the mesh/terrain of that cell. When the player moves outside the boundaries of his cell, i dynamically load more cells in his walking direction based on his viewing distance. This triggers x number of vertex and indexbuffer initializations depending on how many cells that needs to be generated and causes the framerate to drop annoyingly during this time. The generation of terrain data is handled in a separate thread and runs smoothly. The vertex and index buffers are added during the update cycle of the game loop. I´ve tried batching the number of cells to be processed to avoid sending too much data at once into the buffers, which worked ok at a shorter viewing distance (about 9 cells to process), but not as well at greater distances with around 30 cells to process. Any idea how i can optimize this?

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• How to remove text from file icons ?

  - by Jesse

  I am fairly new to Ubuntu (Linux). I noticed when creating a .java file or .py gives me an icon, however when I start writing code it overrides the thumbnail into showing text. Is there a way to disable this silly feature ? When I installed Linux Mint on the VM I noticed I was able to accomplish this task by unchecking "Show text in icon". I know they use Namo as their file manager. I read this thread and it did not work. How to stop Nautilus from creating thumbnails of specific file types?

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