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• Problem using python QPID and gevent together [closed]

  - by William Payne

  I have a python script that pulls messages from an Apache QPID queue, and then uses gevent to perform (IO-bound) tasks on those messages in parallel. The queue that this script pulls from was recently changed: I suspect the version of the C++ QPID broker changed, although I cannot verify this at the present time. Now, my process deadlocks and hangs upon QPID queue creation. I strongly suspect that this is a result of an incompatibility with gevent, although I have not done the work yet to produce a minimal example to demonstrate the problem. (Next on my list). Does anybody else have experience of getting gevent and QPID to work together? or Has anybody else seen the same issues?

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• How can I generate Sudoku puzzles?

  - by user223150

  I'm trying to make a Sudoku puzzle generator. It's a lot harder than I expected and the more I get into it, the harder it gets! My current approach is to split the problem into 2 steps: Generate a complete (solved) Sudoku puzzle. Remove numbers until it's solveable and has only 1 solution. In step 1, since I'm using a brute force methods, I'm facing some run time issues. Is there an optimal way of filling in a complete Sudoku puzzle? In step 2, what kind of algorithm should I use to "puzzlize" a solved sudoku?

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• Is it normal for 12.04 to occupy almost 4GB? Also, related questions

  - by Grant

  I'm using a ASUS EeePC 901 and have some basic questions/issues. I installed 12.04 on the 4GB drive, selecting the option to erase it before doing so. Immediately after the installation I saw that Update Manager had over 100 updates pending. I attempted to install these, but was told that I had less than 100 MB remaining. Does the OS occupy all the other space? It seems that the best solution is to install 12.04 on the 16GB drive. Is this true? If I do this, what is the best way to erase the 4GB drive afterwards?

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• Rendering of Oracle Secure Global Desktop's Administration Console on Modern Browser Versions

  - by Mohan Prabhala

  For customers using Oracle Secure Global Desktop version 4.6x, one of the issues reported is the improper rendering of the administration console when using modern browser versions such as Safari 5, Firefox 4+ or Internet Explorer 9. We are pleased to provide a fix for use of these modern browser versions when using Oracle Secure Global Desktop 4.6x. Please refer to Doc ID 1367923.1 on My Oracle Support. The solution involves a new .jar file, oracletheme.jar and following a few simple instructions. Download the new oracletheme.jar to /tmp and backup the existing one located at  /opt/tarantella/webserver/tomcat/<tomcat_ver>/webapps/sgdadmin/WEB-INF/lib/oracletheme.jar Stop the webserver  /opt/tarantella/bin/tarantella stop webserver Copy the new oracletheme.jar to the correct directory cp /tmp/oracletheme.jar /opt/tarantella/webserver/tomcat/<tomcat_ver>/webapps/sgdadmin/WEB- INF/lib/oracletheme.jar Verify permissions for the file -rw-r----- 1 root ttaserv 280449 Sep 9 2010 oracletheme.jar Finally, restart the webserver /opt/tarantella/bin/tarantella start webserver

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• Where can I learn to write my own database?

  - by Buttons840

  I'm interested in writing my own database - a triple-store. Are there any good resources to help with the challenges of such a project? Or more generally: How can I learn to write my own database? Some specific issues I'm unsure of: How is the data actually stored on the file-system? A flat-file seems easy enough, but a database is a lot more then a flat-file. What kinds of things are typically stored (or cached) in memory? How are indexes created and stored? How is ACID compliance achieved? Etc. This is a big topic, but knowing how to store large amounts of data in a reliable way is good to know. (My investigation into existing triple-stores was summarized back in 2008; not much has changed in 4 years it seems. This is why I want write my own.)

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• Set modified date = created date or null on record creation?

  - by User

  I've been following the convention of adding created and modified columns to most of my database tables. I also have been leaving the modified column as null on record creation and only setting a value on actual modification. The other alternative is to set the modified date to be equal to created date on record creation. I've been doing it the former way but I recent ran into one con which is seriously making me think of switching. I needed to set a database cache dependency to find out if any existing data has been changed or new data added. Instead of being able to do the following: SELECT MAX(modified) FROM customer I have to do this: SELECT GREATEST(MAX(created), MAX(modified)) FROM customer The negative being that it's a more complicated query and slower. Another thing is in file systems I believe they usually use the second convention of setting modified date = created date on creation. What are the pros and cons of the different methods? That is, what are the issues to consider?

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• How can I keep track of a battle log on a web game?

  - by Jay W

  Recently I started working on a Web turn-based PvP RPG game. Now I'm working on the battle system but I encountered some issues: How can I keep track of everything that happens in the battle? It should keep track of the characters on the field, inventory, the damage done etc. I first thought I would simply put it in the (MySQL) database, but I think it will be too much. Especially if several people are in a battle. I thought of puting this in sessions or cookies but I don't think thats reliable. Does anyone have an idea how I can do this?

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• Is it normal for 12.04 to occupy almost 4GB?

  - by Grant

  I'm using a ASUS EeePC 901 and have some basic questions/issues. I installed 12.04 on the 4GB drive, selecting the option to erase it before doing so. Immediately after the installation I saw that Update Manager had over 100 updates pending. I attempted to install these, but was told that I had less than 100 MB remaining. Does the OS occupy all the other space? It seems that the best solution is to install 12.04 on the 16GB drive. Is this true? If I do this, what is the best way to erase the 4GB drive afterwards?

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• Triple Monitor Setup with Nvidia and Compiz

  - by AndrewX192

  I have a triple monitor setup with two video cards on Ubuntu 10.04. I have the monitors and graphics cards currently setup as follows: Nvidia Geforce 210 #1 - 1920x1080 Monitor (Twinview) [Center - Monitor #1] - 1920x1080 Monitor (Twinview) [Right - Monitor #2] Nvidia Geforce 210 #2 - 1920x1080 Monitor (Separate X Screen) [Left - Monitor #3] This works fine, except when I open a program, it shows up in between monitor #1 and #2 - meaning I have to drag it to one screen before I can use the window. Gnome2's gnome-panel also does not work on the twinview setup; it spans between both monitors, but it does not redraw (ex: the clock never changes). In addition, when I maximize an application, it spans both monitors, which is not acceptable. When I enable Xinerama for my setup, gnome-panel no longer spans two monitors, and applications maximize as expected, but compiz does not work, as X11 compositing is not available. The lack of desktop compositing causes problems with dragging windows between screens (redraws take forever). Is there anything I can do to fix these issues without opting for different graphics cards?

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• 301 redirect to 404 page?

  - by Kristian

  Currently i'm migrating www. prefix from my urls and use htaccess to do the job. Since we have new software and cleaned database some of the old urls doesnt exists anymore. Therefore some requests redirect to 404 page. 1. www.domain.com/old-page # htaccess redirect to non-www url, 301 2. domain.com/old-page # page does not exists, 404 Does this method have any SEO issues, or even affect pagerank? Or should i check the page existence before redirecting and show 404 without redirect?

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• 12.04 x64 Server Login Failure

  - by ThoughtCoder

  After some serious GRUB issues after routine kernel updates, forcing a grub-reinstall via chroot and some single-user mode maintenance, I now cannot login to my server (except via single-user mode) When attempting to SSH to the server my connection is reset immediately after entering username - no password prompt is presented. I've plugged in my monitor and keyboard to the headless server and when trying to login I receive: login: "PAM Failure, aborting: Critical error - immediate abort" immediately after entering my username - again, no password prompt is displayed. I am able to gain access via kernel recovery mode and login as root through single-user mode with networking. I've attempted a dpkg reconfigure believing I may have had some incomplete/borked packages, but to no avail. Looking through /etc/pam.d/login doesn't seem to lead me in any obvious directions and I'm afraid I'm out of ideas. Googling doesn't help me much, one guy reinstalled (really don't want to do this) and the rest I could find were old Gentoo related bugs. Any tips?

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• How to copy the file from source to destination only once at a time?

  - by Viswa

  I have to copy the file from my desktop to my mounted directory. I was using the following command to copy the file from my desktop to mounted directory. os.system("cp -f /home/Desktop/filename /media/folder_1"). It works fine. But the problem is while copying the file from my source to mounted directory(folder_1) if any interruption is happens like network down, then the system continuously keep on trying. It couldn't skip that process. Finally, when the network comes the files are again copy to my mounted directory. Due to this continuous trying, next time i try to move the content it throws "permission denied" error. How do i copy the file only once, if any network issues happen then it will not keep try to copy, instead of that, it throws the error. If you know, Let me. Its very useful to me.

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• 13.10 login Background without unity

  - by user204477

  I want to change my login screen background (and keep the dots). But I upgraded to cinnamon 2.0 a day ago and then to 13.10 earlier today. I recently became aware of the issue with cinnamon 2.0 and unity on 13.10. This normally would not matter to me since I use cinnamon instead but the only way I know of to change the login screen background is to change unity background. Also all of my backgrounds are jpgs not pngs (in case anyone was gonna say the replace /usr/share/backgrounds/ubuntu-warty.png) and for some reason gimp has issues so converting them is not currently possible for me.

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• Slow Wireless Reconnect After Suspend

  - by nrhine1

  I a Broadcom 4312 using the STA drivers, I reinstalled ubuntu because the b43 drivers were giving me a huge hassle along with some weird kernel issues. My wireless speed is fine, everything works well, except upon restart of computer and after taking the computer out of suspend. It takes about 30-45 seconds for the wireless to reconnect, and I think it is a driver issue (I clicked on the network manager at the top and for about 30 seconds there are no wireless networks listed.) I tried this advice already: http://lilserenity.wordpress.com/2007/10/31/fix-ubuntu-dropping-wireless-on-suspendhibernate-resume/ which basically says to change this: STOP_SERVICES="" to STOP_SERVICES="networking" in the file /etc/default/acpi-support This did not help anything. Something to note is that the issue does not occur when I am logging back in after already logging in once and logging out.

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• ASUS EeePC Fn+F2 ruins wireless until restart

  - by dawmail333

  I managed to get my wireless working beautifully (ath5k driver working great), and it works over a disable/enable wireless cycle, even a suspend/wakeup cycle (read some people have issues with that). Unfortunately, I discovered that if I press Fn+F2 on my keyboard (Asus EeePC 900HA, so that's the wireless toggle key), wireless then stops working until I restart the computer. How can I fix this? I'm running UNR 10.10 (with Unity turned off tyvm!). I heard something about Jupiter controlling these keys, but what about asus-laptop? How can I fix this behaviour? TIA. (Note, I'm a power user, but still fairly new to Linux. I'm picking up speed though).

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• XNA 2D Rotated Rectangle Collision Response

  - by Kyle Uithoven

  I am using Rotated Rectangles which collide using the Separating Axis Theorem and they work perfectly fine for collision detection using Intersects and Contains. However, I am starting to use faster objects in my game now and there is the issue of the two object overlapping during collision due to their higher velocities. I would like to do a collision response where I find out how much they are overlapping in the X and Y and put position them outside of each other. I would like to use something like this: http://go.colorize.net/xna/2d_collision_response_xna/index.html. But I am having some issues trying to adapt this to handle the rotation of the bounds. Is this possible? Are there any resources out there that I can look at?

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• Installed Ubuntu on a macbook pro and am running into errors with internet

  - by user209270

  I recently installed Ubuntu (64 bit, 12.04) on a mid-2012 Macbook Pro, and I've been having some really annoying issues. Chief among them is that my wireless doesnt seem to function properly. I've installed Ubuntu on this mac before, and again this time the drivers for the wireless card were missing. I, using something along the lines of sudo su apt-get update apt-get upgrade apt-get b43-fwcutter firmware-b43-installer A new problem I've been experiencing however is that none of the networks available in my home show up. I've been able to connect theto themm by going into "Connect to hidden networks" and typing in the network name and password, but when I restart the computer my network (let's just name it "Network1"), doesnt show up. I tried going into "Edit Connections" and it shows up in the wireless tab, but it is never connected to automatically or shows up in the drop-down menu. Any help?

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• Run Tests in Folder

  - by Tomas Mysik

  Hi all, today we would like to show you another minor improvement we have prepared for NetBeans 7.2. Today, let's talk a little bit about testing. This minor improvement will be useful especially for users who have a lot of unit tests (it means all of us, right? ;) - just right click on any folder underneath Test Files node and you will notice: The result is as expected - all the tests from the given folder are run: That's all for today, as always, please test it and report all the issues or enhancements you find in NetBeans BugZilla (component php, subcomponent PHPUnit).

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• Visual Studio 2010 & .NET 4.0 RC in Feb-2010

  Scott says, In order to make sure that these fixes truly address the performance issues reported, and to Other Interested articles…27 New Features of .NET Framework 4.022 New Features of Visual Studio 2008 for .NET Professionals50 New Features of SQL Server 2008IIS 7.0 New featureshelp validate them across the broadest number of scenarios and machine configurations, we’ve decided to ship another public preview release of VS 2010 and .NET 4 before we ship. Specifically, we plan to make a Release Candidate build available in February that everyone will be able to download and test. It will be a public build and include a broad “go live” license that supports production deployment.The goal behind the Release Candidate is to get broad feedback on the readiness of the product. In order to ensure that we are able to receive and react to this feedback, we will also be moving the launch of Visual Studio 2010 and .NET 4 back a few weeks.Continue span.fullpost {display:none;}

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• I'm working on my resume for a job fair this week; any tips? [closed]

  - by buu700

  This will change as I update the document, but here is my resume. The job fair I'm going to is really huge (very good chance that it will determine where I intern this summer), so I would definitely appreciate any possible assistance in polishing this up. Any advice possible will be appreciated, ranging from spacing or absurdly minor formatting issues, to rearranging bullet points, to browser incompatibilities, to major changes in anything I've organised or written. At the moment, my only specific question is whether easter eggs are acceptable (specifically, if representatives who understand the reference will generally frown upon my inclusion of "Hacked The Gibson", given the context). Also, if anyone wants to evaluate it (e.g. font size, final arrangement, etc.), here is a PDF snapshot of the document at the time this question was submitted (the final version will have a different file name and appropriate metadata, for the record). Thanks!

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• Logitech Wireless Keyboard & mouse not working aftesr upgrade to 12.04?

  - by deerjay99

  I upgraded my Dell Dimension 9200C to 12.04 Precise Pangolin with no issues, I ran it fine for a night but when I went back in a couple days later my Logitech Wireless Keyboard K350 and M510 mouse weren't active when booted. I can boot into an older version from the main the boot screen the mouse and keyboard work, but the network stack is gone. It says the networking manager on this version is not compatible. I'm scratching my head, it isn't the mouse and keyboard, they work fine on my dual boot, and they load fine in Knoppix. They did work fine on 12.04 for 1 night. Open to suggestions before I re-install completely.

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• 12.04 freezes on install

  - by CHris

  I'm new to ubuntu and can't for the life of me understand how to get around this issue. I'm having a problem where when I insert the boot disk that i burned for 12.04, it loads and gives me the language option and select an installation type, i select either try ubuntu / install ubuntu and it begins to load. Then after about 5 mintues of the purple screen with the dots under the UBUNTU it freezes the whole computer, and the only way to get out is to turn off the laptop with the power button. I have read previous threads saying people had similar "freezing" issues including ones that mention my model of laptop, HP Pavillion DV1000. But it appears their problems are post installation and relate to their wireless cards. I have tried changing the boot options (F6) and I am totally stuck. Can anyone shed any light on to this issue? Thanks in advance.........

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• How does Ubuntu achieve RGB subpixel rendering for Mono applications?

  - by user100751

  Distributions in the *Ubuntu ecosystem support proper RGB subpixel rendering in Mono based applications (e.g. Banshee) by default, i.e. out of the box without any additional configuration requirements, whereas e.g. Fedora does not. I am aware of general patent infringement issues and the freetype-freeworld libs, but never managed to enable RGB subpixel rendering for Mono in Fedora - it keeps using greyscale. So, as the question title implies: how does *Ubuntu achieve RGB subpixel rendering in Mono applications?

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• Can turning off drm_kms_helper polling affect screen brightness control?

  - by dodecaphonic

  I have a Samsung R430 notebook that has been running Ubuntu for close to a year, now. Since I've upgrated to Maverick, I've been dealing with little, but increasingly annoying issues, that put my faith to question. The first one, a CPU-intensive set of drm_kms_helper, made me compile my own kernel and set polling to off just so I could move my mouse without frequent stuttering. That led me to dealing with a screen that gets dimmer and dimmer after each sleep/wake-up cycle, which eventually leads me to reboot. Since I have seen some KMS and brightness related bugs around, I was wondering if it is a definite cause for my problem. If so, has there been any advance on the excessive polling issue for those of us plagued by it?

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• Distributed Computing - Hybrid Systems Considerations

  When the Cloud was new, it was often presented as an 'all or nothing' solution. Nowadays, the canny Systems Architect will exploit the best advantages of 'cloud' distributed computing in the right place, and use in-house services where most appropriate. So what are the issues that govern these architectural decisions? What can SQL Monitor 3.2 monitor?Whatever you think is most important. Use custom metrics to monitor and alert on data that's most important for your environment. Find out more.

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