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• .NET mulithreading and quad core processors

  - by w0051977

  I have a single threaded application that runs on a machine with a quad core processor. The scheduled tasks that run VB.NET forms are too slow. I am new to multi threading and parallel computing. If you have a single threaded application that runs on a server with a multi core processor then does the application only ever use one of the processors? What happens if you have multiple scheduled tasks and multiple instances are in memory at the same time? I have read this question on Stackoverflow: http://stackoverflow.com/questions/607775/how-to-write-net-applications-that-utilize-multi-core-processors, but I am still not clear.

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• Find out if there is a local user logged in when logging in over ssh

  - by sebastiangeiger

  I need to run some calculations on a machine that I can only access remotely but also serves as a work station. There are many of them and I want to pick a "free" one. Free means in this case that no one is logged in locally. My first try was the who command, but for some reason it only lists "selected" users and I can't really find out how they are selected. Next try: ps aux | cut -d " " -f1 | sort | uniq: better showing a bunch of demons but also the local user that was not displayed by who. My current solution is to go in and do ps aux | grep "gnome-session" which is better but still gives me a lot of junk. Ideally I am looking for something that I can include in my ssh profile that warns me about (active) local users when I log in.

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• Ubuntu 12.04 Touchscreen Calibration

  - by Lee

  I have a machine with Ubuntu 12.04 installed, with dual monitor, via VGA and DVI Interface. The monitor is one touch screen and the other one is regular LCD Monitor. The touch screen is made in China with some unknown brand, and I am using eGalax Driver. The touch screen is now detected and works, but i need to do some calibration since it does not correctly perform click on touch. The problem is, when I’m using xinput_calibrator, it shows 4 crosses to be clicked on, because I’m using dual monitor, the crosses is now show 2 on the touch screen (touchable) and the others on the other monitor which is regular non-touch monitor. Please help, thank you.

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• Why do HDFS clusters have only a single NameNode?

  - by grautur

  I'm trying to understand better how Hadoop works, and I'm reading The NameNode is a Single Point of Failure for the HDFS Cluster. HDFS is not currently a High Availability system. When the NameNode goes down, the file system goes offline. There is an optional SecondaryNameNode that can be hosted on a separate machine. It only creates checkpoints of the namespace by merging the edits file into the fsimage file and does not provide any real redundancy. Hadoop 0.21+ has a BackupNameNode that is part of a plan to have an HA name service, but it needs active contributions from the people who want it (i.e. you) to make it Highly Available. from http://wiki.apache.org/hadoop/NameNode So why is the NameNode a single point of failure? What is bad or difficult about having a complete duplicate of the NameNode running as well?

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• Solved: Chrome v18, self signed certs and &ldquo;signed using a weak signature algorithm&rdquo;

  - by David Christiansen

  So chrome has just updated itself automatically and you are now running v18 – great. Or is it… If like me, you are someone that are running sites using a self-signed SSL Certificate (i.e. when running a site on a developer machine) you may come across the following lovely message; Fear not, this is likely as a result of you following instructions you found on the apache openssl site which results in a self signed cert using the MD5 signature hashing algorithm. Using OpenSSL The simple fix is to generate a new certificate specifying to use the SHA512 signature hashing algorithm, like so; openssl req -new -x509 -sha512 -nodes -out server.crt -keyout server.key Simples! Now, you should be able to confirm the signature algorithm used is sha512 by looking at the details tab of certificate Notes If you change your certificate, be sure to reapply any private key permissions you require – such as allowing access to the application pool user.

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• Solved: Chrome v18, self signed certs and &ldquo;signed using a weak signature algorithm&rdquo;

  - by David Christiansen

  So chrome has just updated itself automatically and you are now running v18 – great. Or is it… If like me, you are someone that are running sites using a self-signed SSL Certificate (i.e. when running a site on a developer machine) you may come across the following lovely message; Fear not, this is likely as a result of you following instructions you found on the apache openssl site which results in a self signed cert using the MD5 signature hashing algorithm. The simple fix is to generate a new certificate specifying to use the SHA1 signature hashing algorithm, like so; openssl req -new -x509 -sha1 -nodes -out server.crt -keyout server.key Simples!

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• How can I run Tellme more software on Ubuntu 14.04 LTS?

  - by Alex Walker

  I'm new to Ubuntu and I've been loving it so far, I have it on my 2 computers and I think everyone should try it. I run an English Laboratory in a University (Our PC's are old and slow) so I want to install Ubuntu on all of them so the students can have a better experience here, the problem is tha we NEED Tell me more Software which I believe it's only for windiws. How can I install it in ubuntu? do I need wine or a virtual machine with Windows? please help! and thank you so much!!

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• Problems installing 13.10 inside VMWare Player 4

  - by Thomas S.

  In the past I had no problems installing Ubuntu 12.04 inside VMWare Player 4.0.4 on my Windows 7 Pro machine. Now I installed Ubuntu 13.10 and have a couple of problems: the default screensize (even during the installation) is gigantic I've told Ubuntu to automatically login - after reboot the gigantic screen occurs without showing anything, without doing anything on mouse clicks, Ctrl+Alt+Backspace does not work switching to console using Ctrl+Alt+F1...F6 works, but is incredible slow invoking 'sudo reboot now' does not succeed, it prints Killing all remining processes... [fail] Restoring resolver state... [ OK ] Will now switch to single-user mode root@ubuntu1310:~# invoking now 'shutdown now' will soon show the same error. What I need to do to get Ubuntu 13.10 up and running in VMWare Player?

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• Friday Fun: E7 (Mission to Save Earth)

  - by Asian Angel

  It has been another long week at work and you should take a few minutes to relax and have some fun. In this week’s game you journey to E7 in an attempt to find and destroy the deadly bomb that is aimed at planet Earth. Can you survive the journey across the planet and complete your mission? Latest Features How-To Geek ETC Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions Super-Charge GIMP’s Image Editing Capabilities with G’MIC [Cross-Platform] Access and Manage Your Ubuntu One Account in Chrome and Iron Mouse Over YouTube Previews YouTube Videos in Chrome Watch a Machine Get Upgraded from MS-DOS to Windows 7 [Video] Bring the Whole Ubuntu Gang Home to Your Desktop with this Mascots Wallpaper Hack Apart a Highlighter to Create UV-Reactive Flowers [Science]

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• How can you predict the time it will take for two processes in two different machines in a cluster to communicate?

  - by Dokkat

  I am trying to develop a computing application which needs a lot of memory (500gb). Buying a single machine for that is overly expensive. I can, though, buy ~100 small instances on Digital Ocean or similar, divide the memory in blocks and use TCP to emulate shared memory between the instances. Now, my question is: how can I measure/predict the time it will take for two processes in two different machines like that to share information, in comparison to IPC and shared memory? Are there rules of thumb? I don't want exact values, but knowing more or less how much faster one is would be very helpful in visualising the feasibility of this approach.

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• INVITATION: Formez-vous sur la solution Oracle Database Appliance !

  - by mseika

  Formez-vous sur la solution Oracle Database Appliance ! Cher partenaire, Arrow a le plaisir de vous inviter au bootcamp ODA - Oracle Database Appliance - qui aura le 30 octobre prochain à Colombes, dans les locaux d’Oracle France. Venez découvrir comment conquérir de nouveaux marchés grâce à lanouvelle appliance base de données Oracle! Arrow vous propose une demi-journée pour comprendre ODA et démontrer les bénéfices de cette solution accessible à tous. Au programme de cet après-midi de formation : une démonstration réalisée en temps réel sur la machine Arrow, déplacée pour l’occasion et de multiples échanges avec notre spécialiste ODA , Stéphane KIDJO, Consultant Avant-Vente chez Arrow. AGENDA : 14h00 - Accueil-café14h20 – Lancement de la démonstration :• Présentation et installation de l’appliance• Présentation de la solution : positionnement marché, bénéfices• Proposition de valeur• Une solution tarifaire attractive 16h00 - De nouvelles opportunités pour vendre Oracle 11g R2 et ses options 16h30 – Désinstallation de l’appliance 16h45 – Questions & Réponses 17h00 – Echanges autour d’un goûter Ce workshop est gratuit. Pré-inscription obligatoire. Nombre de places limité.

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• Random freezes on MBP9,2 + Ubuntu 12.04

  - by EnToutCas

  I have a MBP9,2 (mid-2012) at work. I put Ubuntu 12.04 on it after some efforts. Everything works more or less now, except I get random freezing every now and then. I have to power off the machine to restore it. Wondering if anyone had the similar issue. My setup: MacBook Pro 9,2 (mid 2012) Ubuntu 12.04 (installed using the special image for Macs) No proprietary drivers xmonad on Unity 2D So far the freezes look to be sporadic and spontaneous.

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• Sound works for only one user at a time

  - by Patrick

  I've noticed that sound becomes unavailable to me when someone else is logged into my machine and playing music (or has facebook open) in the other account. I've had to ask them to unlock their account and turn it off so I can get sound in my own stuff. Even in sound preferences, the hardware itself disappears and output is "dummy sound". Is there a way to prevent this from happening? What would be really good is if I could turn down the volume (or mute entirely) all the sounds on all other accounts on a per-user basis from my sound preferences without affecting whatever setting they have - essentially saying whenever user A is logged in, all sounds from user B's account are muted and anything from user C's account is at 50% while I can still have my own at full volume.

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• Ubuntu 13.10 alongside Windows 7 - Mission Impossible?

  - by Przemek Jedlikowski

  I just want to install Ubuntu 13.10 alongside Windows 7 HP on my EeePC 1215N. I can't do it when Windows 7 is booted up (wubi.exe hasn't got that option), so I booted it from USB key. Everything's loaded, I double-click Install Ubuntu. I click 'Next ', then I choose that I want to install Ubuntu alongside Windows 7. And the machine restarts. Not resets. Restarts. X server's killed immediately, I can see the console only. What do I have to do now?

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• How do I change the color of the screen that is displayed before the login screen?

  - by Jake Newkirk

  How do I change the color that the system displays just before the login screen is displayed? Here is the boot sequence on my machine in the order that things are displayed: The BIOS screen is flashed. A Black screen is displayed for a few seconds. My Plymouth splash screen is displayed. Purple screen is displayed for a few seconds (This is what I want to change). Finally, the login screen is displayed. Please let me know if you require any additional information while addressing this problem and as always, thank you for your time.

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• How to change Port 27000 from filtered to open status

  - by Nadarajah Ranjan

  In my ubuntu box I am running flexlm licensing software on port 27000 and I am able to pull the license from the this port to run the simulation software locally. I am also trying to run the same software in another Linux machine (opensuse) by using the flexlm license from the Ubuntu box. However, my opensuse box is unable to communicate with port 27000 in my Ubuntu box. I have turned off the firewall on the Ubuntu box, played around with iptables and when I do a nmap from my opensuse box to Ubuntu box the message I get is that port 27000 is on filtered status. My understanding is that filtered status does not allow the opensuse box to communicate with Ubuntu. My question is how to change port 27000 from filtered status to open status? Hope someone can help me out. Thank you.

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• The Truth About Wi-Fi Signal Strength

  - by Jason Fitzpatrick

  Whether it’s the structural layout of your home or just ghosts in the machine, we’re all familiar with inexplicable Wi-Fi dead spots. One extra puzzling situation, unseen in the comic here, is when the addition of another wireless node actually causes issues with your Wi-Fi connectivity. There’s nothing more frustrating than having twice the Wi-Fi node power and half the actual signal at your laptop. If you’re looking to extend your Wi-Fi network coverage headache free, check out our guides to doing so with Tomato-powered routers and DD-WRT-powered routers. Your Wireless Internet Signal Strength [via FailDesk] How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere How To Boot Your Android Phone or Tablet Into Safe Mode

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• Copying an SSH Public Key to a Server

  - by Nathan Arthur

  I'm attempting to setup a git repository on my Dreamhost web server by following the "Setup: For the Impatient" instructions here. I'm having difficulty setting up public key access to the server. After successfully creating my public key, I ran the following command: cat ~/.ssh/[MY KEY].pub | ssh [USER]@[MACHINE] "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys" ...replacing the appropriate placeholders with the correct values. Everything seemed to go through fine. The server asked for my password, and, as far as I can tell, executed the command. There is indeed a ~/.ssh/authorized_keys file on the server. The problem: When I try to SSH into the server, it still asks for my password. My understanding is that it shouldn't be asking for my password anymore. What am I missing?

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• Looking for games in environments similar to a pinball table

  - by chaosTechnician

  I'm on a team of students working on a third-person adventure game that takes place inside a pinball machine (like, small scale, on the surface, avoiding pinballs, etc). One of my responsibilities on the project is to find games that are similar to this concept in appearance and/or gameplay for reference. So, does anyone know of games (other than pinball) that takes place in a pinball-like environment? Or, adventure games that take place in small, cramped environments with multiple paths around the world? Or games in which the player is often bombarded with balls (or other similar unintelligent obstacles)? Or games that take place on a small scale?

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• Alexa indexing browsing history?

  - by Haluk

  We have this test.php sitting around in a forgotten folder. It is a script which just sends an email to our site admin. We never had a page linking to it. It is not indexed by Google. It does not exist in the Internet Archive Wayback Machine. But every now and then it gets crawled by ia_archiver. I wonder how it got indexed. Could it be because of the Alexa toolbar installed on our computer? Does Alexa index our personal browsing history?

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• not able to boot through pendrive and run set up

  - by Ash

  I have dell inspiron, previously i have install ubuntu 11.10 on my win7 and make it dual boot. but since i want to upgrade my ubuntu version and change the partion spacing, i have delete 11.10 partion directly and extend my hardrive space(windows + ubuntu) at that moment everything is fine. then i have put 12.04 version pendrive in usb boot from usb and install the 12.04 32 bit . it was installed but can't showing dual boot option like 11.10 and my machine directly boot into win7 . so instantly i again delete my 12.04 partion . Now i am able to login into win7 but whenever i put pendrive(12.04) into usb drive i am facing error of "grub rescue" even though i try to put lower version(11.04) it showing another error "Error: No default or UI configuration directive found boot " i have reinstall win7 and reformat all partion still i am facing same error :( i need help badly.

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• Need to set up shared storage for Guest virtual machines that are running on a Xen host

  - by Sajith

  My environment: I am doing these things at home with the purpose of learning about virtualization techniques. My machine have quad core processor that supports Intel-VT and 8GB RAM. XEN is the virtualization platform. In short, all domUs are LVM based. Mainly I have two questions; I need to have shared storage for these VMs. Something like NFS / NAS / iSCSI etc. However, I don't know which one is the best solution. Therefore, can someone tell me which suits best? Please note that, this shared storage need to be accessed by the other physical machines in the network. How to implement the selected solution for question #1? Any tutorials / guidelines / ebooks will be a great help and highly appreciated. Thank you in advance :)

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• Behavior tree implementation details

  - by angryInsomniac

  I have been looking around for implementation details of behavior trees, the best descriptions I found were by Alex Champarand and some of Damian Isla's talk about AI in Halo 2 (the video of which is locked up in the GDC vault sadly). However, both descriptions fall short of helping one actually create a BT, one particular question has been bugging me for a while. When is the tree in a behavior tree evaluated? Furthermore: If the tree is in the middle of executing a sequence of actions (patrolling waypoints) and a higher priority impulse comes in (distraction sound) , how to switch to that side of the tree seamlessly without resorting to a state machine like system and if it is decided that the impulse was irrelevant (the distraction is too far away to affect this guard), how to go back to the last thing that the guard was doing ? I have quite a few questions like this and I don't wish to flood the board with separate queries so if you know of any resource where questions like these can be answered I would be very grateful.

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• How to use PostgreSQL on AWS - Ubuntu 11.10

  - by That1Guy

  I'm extremely new to cloud-computing, Linux, and PostgreSQL, so if this is a stupid question, I apologize. I've managed to create an m1.large instance running Ubuntu 11.10, connect via Putty SSH, and install PostgreSQL (sudo apt-get install postgresql), but that is as far as I've gotten. My goal is to run several python web-scraping scripts that I've written on this instance (so as not to eat up all of our bandwidth (smaller company at the moment)) and insert the scraped data into a PostgreSQL table on the instance and later retrieve that data to store on our local server (as I've heard AWS EBS is unreliable and I don't want to take chances). How can I configure PostgreSQL on my AWS instance? How can I access the data from my machine? I currently use PgAdmin3 to manage PosgreSQL on our local server. Can I use this same interface to manage PostgreSQL on my AWS instance? Any suggestions, solutions, links, etc is greatly appreciated. And again, if this is a dumb question, I apologize.

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• Uploading Files Using ASP.NET Web Forms, Generic Handler and jQuery

  - by bipinjoshi

  In order to upload files from the client machine to the server ASP.NET developers use FileUpload server control. The FileUpload server control essentially renders an INPUT element with its type set to file and allows you to select one or more files. The actual upload operation is performed only when the form is posted to the server. Instead of making a full page postback you can use jQuery to make an Ajax call to the server and POST the selected files to a generic handler (.ashx). The generic handler can then save the files to a specified folder. The remainder of this post shows how this can be accomplished.http://www.bipinjoshi.net/articles/f2a2f1ee-e18a-416b-893e-883c800f83f4.aspx      

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