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• Help deciding on language for a complex desktop - web application

  - by user967834

  I'm about to start working on a fairly complex project needing a desktop GUI as well as a web interface and I need to decide on a language(s) to use. This is from an electrical engineering/robotics background. These are the requirements: Program will have to read data from multiple sensors and inputs (motion sensor, temperature sensor, capacitive sensor, infrared, magnetic sensors, etc) through a port on a computer - so either through USB or ethernet. Program will have to be able to send control signals based on this input. Program will have to continuously monitor all input signals at all times - so realtime data. Program will require authentication. Program will need to be controllable from a web interface from anywhere via logging in to a website. Web interface will also need to have realtime feedback once authenticated. What language do you think would best accomplish this? I was thinking maybe saving everything into a database which can be accessed by both the desktop and web app? And would Python be able to do all of this? Or something like a remote desktop app? I know this is a complex project but let's assume I can learn any language. Has anyone done something like this and if so how did you accomplish it?

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• Limiting calls to WCF services from BizTalk

  - by IntegrationOverload

  ** WORK IN PROGRESS ** This is just a placeholder for the full article that is in progress. The problem My BTS solution was receiving thousands of messages at once. After processing by BTS I needed to send them on via one of several WCF services depending on the message content. The problem is that due to the asynchronous nature of BizTalk the WCF services were getting hammered and could not cope with the load. Note: It is possible to limit the SOAP calls in the BtsNtSvc.exe.Config file but that does not have the desired results for Net-TCP WCF services. The solution So I created a new MessageType for the messages in question and posted them to the BTS messaeg box. This schema included the URL they were being sent to as a promoted property. I then subscribed to the message type from a new orchestraton (that does just the WCF send) using the URL as a correlation ID. This created a singleton orchestraton that was instantiated when the first message hit the message box. It then waits for further messages with the same correlation ID and type and processs them one at a time using a loop shape with a timer (A pretty standard pattern for processing related messages) Image to go here This limits the number of calls to the individual WCF services to 1. Which is a good start but the service can handle more than that and I didn't want to create a bottleneck. So I then constructed the Correlation ID using the URL concatinated with a random number between 1 and 10. This makes 10 possible correlation IDs per URL and so 10 instances of the singleton Orchestration per WCF service. Just what I needed and the upper random number is a configuration value in SSO so I can change the maximum connections without touching the code.

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• NetBeans has broken interface with OpenJDK

  - by Krzysztof Stanislawek

  Sorry for English. Usually (say, at 4/5 of times), when I start NetBeans, interface is partially broken. For example, menu items are appearing and at once disappearing after click; some parts of editor are also blocked for cursor actions. Another issue is broken Options window - I can show it only once for NetBeans execution. There are more similar issues. $ java -version java version "1.7.0_55" OpenJDK Runtime Environment (IcedTea 2.4.7) (7u55-2.4.7-1ubuntu1~0.13.10.1) OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode) Version of NetBeans is 7.0.1. Linux version is Mint 16. I use Mate. I had the same issue at other computer, at the same operating system. I know that installing Sun version of Java could help, but I also know that there shouldn't be such issue with OpenJDK. Also, I had other problem with NetBeans and Sun Java 8 - NetBeans suddenly crashed before he fully started, so I want to stick with OpenJDK. What causes my problem? Should I use other version of NetBeans/OpenJDK?

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• I've inherited 200K lines of spaghetti code -- what now?

  - by kmote

  I hope this isn't too general of a question; I could really use some seasoned advice. I am newly employed as the sole "SW Engineer" in a fairly small shop of scientists who have spent the last 10-20 years cobbling together a vast code base. (It was written in a virtually obsolete language: G2 -- think Pascal with graphics). The program itself is a physical model of a complex chemical processing plant; the team that wrote it have incredibly deep domain knowledge but little or no formal training in programming fundamentals. They've recently learned some hard lessons about the consequences of non-existant configuration management. Their maintenance efforts are also greatly hampered by the vast accumulation of undocumented "sludge" in the code itself. I will spare you the "politics" of the situation (there's always politics!), but suffice to say, there is not a consensus of opinion about what is needed for the path ahead. They have asked me to begin presenting to the team some of the principles of modern software development. They want me to introduce some of the industry-standard practices and strategies regarding coding conventions, lifecycle management, high-level design patterns, and source control. Frankly, it's a fairly daunting task and I'm not sure where to begin. Initially, I'm inclined to tutor them in some of the central concepts of The Pragmatic Programmer, or Fowler's Refactoring ("Code Smells", etc). I also hope to introduce a number of Agile methodologies. But ultimately, to be effective, I think I'm going to need to hone in on 5-7 core fundamentals; in other words, what are the most important principles or practices that they can realistically start implementing that will give them the most "bang for the buck". So that's my question: What would you include in your list of the most effective strategies to help straighten out the spaghetti (and prevent it in the future)?

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• Release: Oracle Java Development Kit 8, Update 20

  - by Tori Wieldt

  Java Development Kit 8, Update 20 (JDK 8u20) is now available. This latest release of the Java Platform continues to improve upon the significant advances made in the JDK 8 release with new features, security and performance optimizations. These include: new enterprise-focused administration features available in Oracle Java SE Advanced; products offering greater control of Java version compatibility; security updates; and a very useful new feature, the MSI compatible installer. Download Release Notes Java SE 8 Documentation New tools, features and enhancements highlighted from JDK 8 Update 20 are: Advanced Management Console The Java Advanced Management Console 1.0 (AMC) is available for use with the Oracle Java SE Advanced products. AMC employs the Deployment Rule Set (DRS) security feature, along with other functionality, to give system administrators greater and easier control in managing Java version compatibility and security updates for desktops within their enterprise and for ISVs with Java-based applications and solutions. MSI Enterprise JRE Installer Available for Windows 64 and 32 bit systems in the Oracle Java SE Advanced products, the MSI compatible installer enables system administrators to provide automated, consistent installation of the JRE across all desktops in the enterprise, free of user interaction requirements. Performance: String de-duplication resulting in a reduced footprint Improved support in G1 Garbage Collection for long running apps. A new 'force' feature in DRS (Deployment Rule Set) which allows system administrators to specify the JRE with which an applet or Java Web Start application will run. This is useful for legacy applications so end users don't need to approve security exceptions to run.  Java Mission Control 5.4 with new ease-of-use enhancements and launcher integration with Eclipse 4.4 JavaFX on ARM Nashorn performance improvement by persisting bytecode after inital compilation There's much more information to be found in the JDK 8u20 Release Notes.

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• dist-upgrade runs and completes but current kernel stays the same

  - by jaguare22

  I think that my system is staying at an older kernel version. It seems to update when I run dist-upgrade but the current kernel version doesn't change. Is it possible the system is set to install new kernel updates but only load an older version at start up? $ uname -a Linux HTPC 3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:32:50 UTC 2012 i686 athlon i386 GNU/Linux $ dpkg --list | grep linux-image ii linux-image-3.2.0-32-generic 3.2.0-32.51 Linux kernel image for version 3.2.0 on 32 bit x86 SMP ii linux-image-3.2.0-32-generic-pae 3.2.0-32.51 Linux kernel image for version 3.2.0 on 32 bit x86 SMP ii linux-image-3.2.0-32-virtual 3.2.0-32.51 Linux kernel image for version 3.2.0 on 32 bit x86 Virtual Guests dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' linux-headers-3.2.0-36 linux-headers-3.2.0-36-generic-pae linux-headers-3.2.0-37 linux-headers-3.2.0-37-generic-pae linux-headers-3.2.0-38 linux-headers-3.2.0-38-generic-pae linux-headers-3.2.0-39 linux-headers-3.2.0-39-generic-pae linux-headers-3.2.0-40 linux-headers-3.2.0-40-generic-pae linux-headers-3.2.0-41 linux-headers-3.2.0-41-generic-pae linux-headers-3.2.0-43 linux-headers-3.2.0-43-generic-pae linux-headers-3.2.0-44 linux-headers-3.2.0-44-generic-pae linux-headers-3.2.0-45 linux-headers-3.2.0-45-generic-pae linux-headers-3.2.0-48 linux-headers-3.2.0-48-generic-pae

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• Pidgin XML

  - by David Totzke

  I'm looking at an xml document that gets passed to a COM object (yes, I said the "C" word) to save a new record.  You can tell by the "new|" at the top of the file before the xml declaration.  If we were saving, there would be "edit|" at the top.  Couldn't you just have a root element with something like: <myRootElement mode="new"> Ah, here's why that won't work... There's no single root element but that's ok because next we find that this document is actually several documents.  <?xml version="1.0"?> appears several times.  The final document opens with <myElementStart> and closes with <myElementEnd> so it's not even well-formed. This isn't a style thing.  This is broken.  I mean, basic well-formed XML only has two rules; three if you count the xml declaration but it works as a document for DTO purposes without it. One root element. Close all elements with a matching tag. As a result, both ends of this conversation need to speak the same dialect of broken XML in order to communicate.  To join the conversation, you must also learn pidgin XML. How can you start out so right - XML being the obvious choice in this instance - and then go so horribly wrong? Dave Just because I can…

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• How should I describe the process of learning someone else's code? (In an invoicing situation.)

  - by MattyG

  I have a contract to upgrade some in-house software for a large company. The company has requested multiple feature additions and a few bug fixes. This is my first freelance style job. First, I needed to become familiar with how the application worked - I learnt it as if I was a user. Next, I had to learn how the software worked. I started with broad concepts, and then narrowed down into necessary detail before working on each bug fix and feature. At least at the start of the project, it took me a lot longer to learn the existing code than it did to write the additional features. How can I describe the process of learning the existing code on the invoice? (This part of the company usually does things in-house, so doesn't have much experience dealing with software contractors like me, and I fear they may not understand the overhead of learning someone else's code). I don't want to just tack the learning time onto the actual feature upgrade, because in some cases this would make a 'simple task' look like it took me way too long. I want break the invoice into relevant steps, and communicate that I'm charging for the large overhead of learning someone else's code before being able to add my own to it. Is there a standard way of describing this sort of activity when billing for a job?

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• Gems In The Visual Studio 2010 Training Kit &ndash; Introduction to MEF: Learning Labs

  - by Jim Duffy

  No, this post doesn’t have anything to do with cooking up illegal drugs in some rundown shack outside of town. That, my friends, would be a meth lab and fortunately that is waaaaay outside my area of expertise. Now I can talk Kentucky bourbon, or as Homer Simpson would say “mmmmmmmmmmm bourbon”, with you but please refrain from asking me meth questions. :-) Anyway, what I’m talking about are the MEF (Managed Extensibility Framework) Learning Labs contained in the Visual Studio 2010 and .NET Framework 4 Training Kit. Not sure what MEF is and need an overview? Then start here or here. Ok, so you’ve read a bit about MEF or heard about MEF and you’re thinking it might be something you and your development team might want to take a hands-on look at. I have good news then because contained in the Visual Studio 2010 and .NET Framework 4 Training Kit is a series of hands-on learning labs for MEF. I’ve added working my way through them to my “things I want to take a closer look at” list. Have a day. :-|

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• How should we deal with multiple transaction-report requests?

  - by Mithir

  We are developing a system for the retail market which one of it's features will enable clients(actually consumer clubs) to go through all transactions made by end-clients. One of the ways to get this information will be via an API. The idea is that there will be requests for reports with a start date and an end date, and a response will have all the transactions between those dates. We are worry that some reports may be very large, and that some clients will repeatedly request for reports, in this case the DB and CPU will be very overloaded. The same server that will service those requests, also takes care the the actual retail transactions (received by proprietary devices) and a Web application. We are not sure about how to limit the report requests from the API so that it won't affect the system too much. So, how should we deal with this scenario? any thoughts? EDIT: just to make clear: When I mentioned proprietary devices I meant "On-Location" devices which are used during sales with end-clients, this means that these requests shouldn't get delayed, and this is the main concern.

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• SOA Specialization update

  - by Jürgen Kress

  SOA Specialization is taking off, more and more customers ask for Specialized Partners, make sure you start your own Specialization. To align the number of required Oracle Service-Oriented Architecture Certified Implementation Specialist we reduced them from 4 to 2 consultants. For details on Specialization please see SOA & Application Grid Specialization Guide  SOA & Application Grid Specialization Checklist Thanks for all the partners who became SOA Specialized in 2010! Accenture & Infosys Technologies Limited & Atos Origin & CedarCrestone, Inc. & FUJITSU & OPITZ CONSULTING GmbH& Zensar Technologies & ECS Team & Zirous Inc  Your company is missing? Make sure you add the SOA Specialization information in your solutions catalog For more information on SOA Specialization and the SOA Partner Community please feel free to register at www.oracle.com/goto/emea/soa (OPN account required) Blog Twitter LinkedIn Mix Forum Wiki Website Technorati Tags: SOA Specialization,SOA,soacommunity,OPN,Oracle,Jürgen Kress,solutions catalog

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• Ubuntu-Java Installation-Topcoder-“Java not found”

  - by hakuna121

  I realized that this might be the dumbest question here, but being a total beginner as I am, I really couldn't figure it out after trying all kinds of instructions I could found on the web. Specs: Ubuntu 13.04; What I intended to do: check out the Algorithm Competition section, by clicking the second-to-left tab,located on the top-left of the page: http://community.topcoder.com/tc What I got: a pop-up saying Java not found! Java could not be automatically detected on your machine. This page will attempt to automatically install Java and Java Web Start. If the download and installation does not occur automatically, click the link below to go to the Sun website where you can download the latest version of Java. What I did: I followed instructions on this Ubuntu Documentation page: https://help.ubuntu.com/community/Java and installed OpenJDK(Java Runtime Environment/Browser plugin/SDK) through Ubuntu Software Center. Then I rebooted the system, tried the page again. But I still got the java not found pop-up described above. Question: What's missing the get this working? Thank you!

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• thick client migration to web based application

  - by user1151597

  This query is related to application design the technology that I should consider during migration. The Scenario: I have a C#.net Winform application which communicates with a device. One of the main feature of this application is monitoring cyclic data(rate 200ms) sent from the device to the application. The request to start the cyclic data is sent only once in the beginning and then the application starts receiving data from the device until it sends a stop request. Now this same application needs to be deployed over the web in a intranet. The application is composed of a business logic layer and a communication layer which communicates with the device through UDP ports. I am trying to look at a solution which will allow me to have a single instance of the application on the server so that the device thinks that it is connected as usual and then from the business logic layer I can manage the clients. I want to reuse the code of the business layer and the communication layer as much as possible. Please let me know if webserives/WCF/ etc what i should consider to design the migration. Thanks in advance.

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• Thunderbird keeps crashing Ubuntu 12.04 64 bit

  - by maurizio ribera d'alcala'

  I have been using Thunderbird for years under different versions of Ubuntu, including 12.04 since its release. From a couple of days it keeps crashing after a few seconds after start. I tried to reinstall it creating a new profile and copying the old mail, file by file. After one day of normal functioning it started again to crash. Mozilla is receiving the crash reports. Following is the content of the last one: Add-ons: [email protected]:15.0,[email protected]:0.3.11,[email protected]:0.9.3,[email protected]:3.4.1,[email protected]:15.0,[email protected]:0.5.1,{b4447f60-db9c-11da-a94d-0800200c9a66}:0.9.1,{972ce4c6-7e08-4474-a285-3208198ce6fd}:15.0 BuildID: 20120827103657 CrashTime: 1347200254 EMCheckCompatibility: true Email: [email protected] FramePoisonBase: 7ffffffff0dea000 FramePoisonSize: 4096 InstallTime: 1346431480 Notes: OpenGL: Tungsten Graphics, Inc -- Mesa DRI Intel(R) Sandybridge Mobile -- 3.0 Mesa 8.0.2 -- texture_from_pixmap ProductID: {3550f703-e582-4d05-9a08-453d09bdfdc6} ProductName: Thunderbird ReleaseChannel: release SecondsSinceLastCrash: 1109 StartupTime: 1347200242 Theme: classic/1.0 Throttleable: 1 Vendor: Version: 15.0 I started Thunderbird in safe mode and tested all the add-ons. Apparently is the 'Unity Launcher Integration' that creates the problem. I say apparently because I want two wait for two-three days to be sure TB returns to its regular functioning. Is this a bug? can it be solved

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• How do I debug an overheating problem?

  - by Tab

  Hello guys. I have a problem with my Laptop (Dell Inspiron 1564 Core i5 4GB Ram VGA ATI Mobility Radeon HD 4300 running Ubuntu 10.10 32bit). It shuts down abruptly without even a lag in the application I am working with before shutdown. I think it's overheating problem. Actually the laptop is hot all the time when I am running Ubuntu. When I switch back to windows, even with intense load it won't shutdown or show any problem as long as I keep proper ventilation (when the air openings are blocked it does the same). Actually on Ubuntu i don't usually do things that need much CPU power, usually surfing internet, coding web pages and sometimes playing with python and ruby. I am not enabling desktop effects so no GPU load except the normal GNOME gui. Now as I am writing the Processor load in the panel monitor applet is 0%, Memory 11% by programs, 22% by cache. And i have CPU Frequency monitor for each of the 4 cores set to 1.20 Ghz (the lowest possible value, i am not sure if this applet does really limit CPU usage). Running sensors in terminal gave me temp1: +26.8°C (crit = +100.0°C) temp2: +0.0°C (crit = +100.0°C) hddtemp /dev/sda at the terminal gave me /dev/sda: WDC WD3200BEVT-75ZCT2: 46°C All that fine but the laptop is Really hot i can feel it in the keyboard, mouse pad is painful to touch, and the fan is always spinning. I am also placing 2 small fans running on USB under the laptop right now and the laptop is lifted over the fans so it's well ventilated. When I am running windows it doesn't get that hot except when there is a really big load on the CPU and this is keeping me away from using Linux for everyday tasks. Actually I don't care much for speed as I can deal with low speed it's not going to shutdown abruptly. So please if you can help me and tell me what are the possible causes, where should I start ?

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• How to get started in coding for JBoss

  - by Mister IT Guru

  I have an idea on how to revamp our internal application, after having accessed the needs of the users, addressing thier current issues, and the like. But I am not a coder. My last application I wrote was in college, in C, (java wasn't invented-ish!) and it was a booking system, with the option to add on other modules, blah blah. I got an A, but I became a system administrator instead, more intrested in designing and maintainend networks and infrastructure, but with the advent of virtualisation, and linux management tools such as puppet I can now manage infrastructure in my sleep! Now I want to write code - to put on my infastructure, and I want to build .... a booking system! This is just to get experience, but I am at a loss as to where to start. Setting up the environment, will take me about a day. Writing the spec, even how I want it to work, I already know, but as for actually coding in a decent manner, I can only guess. If anyone can recommend a book, website, blog, twitter person to follow, or just advice on how to build a kick butt basic jboss app, then please, "I AM READY TO LEARN" :)

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• Presentation Plugin for NetBeans IDE 7.2

  - by Geertjan

  I got some excellent help from Mark Stephens, who is from IDR Solutions, which produces JPedal. Using the LGPL version of JPedal, and code provided by Mark, it's now possible to right-click the node that appears in the Presentation Window: ...after which, using a file browser (to locate a file on disk) or a URL (a very simple check is done, the URL must start with "http" and end with "pdf"), you can now open PDF files as images (thanks to conversion from PDF to images done by JPedal) into NetBeans IDE, typically (I imagine) for presentation purposes: Note that you should consider the plugin in "alpha" state. But, despite that, I've had good results. Try it and use the URL below, as a control test (since it works fine for me), which produces the result shown above: http://edu.netbeans.org/contrib/slides/netbeans-platform/presentation-4-actions.pdf  However, for some PDFs, the plugin doesn't work, and I don't know why yet (trying to figure it out with Mark), resulting in this stack trace: java.lang.ArrayIndexOutOfBoundsException: 8 at org.jpedal.objects.acroforms.formData.SwingData.completeField(Unknown Source) at org.jpedal.objects.acroforms.rendering.DefaultAcroRenderer.createField(Unknown Source) at org.jpedal.objects.acroforms.rendering.DefaultAcroRenderer.createDisplayComponentsForPage(Unknown Source) at org.jpedal.PDFtoImageConvertor.convert(Unknown Source) at org.jpedal.PdfDecoder.getPageAsImage(Unknown Source) at org.jpedal.PdfDecoder.getPageAsImage(Unknown Source) Here's the location of the plugin, install it into NetBeans IDE 7.2; feedback is very welcome: http://plugins.netbeans.org/plugin/44525

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• Where is my ram?

  - by gsedej

  I have 2GB installed on my machine running Ubuntu 12.04. After some time of use, I see much of my RAM used. The RAM does not free enough even though I closed all my programs. I included 2 screenshots. First is "Gnome system monitor" (all process) and second is "htop" (with sudo), both sorted by memory usage. From both you see, that it's not possible that all running apps takes together 1GB of memory. First 7 biggest programs sum 250, but others are much smaller (all can't sum even 100MB). The cache is 300MB (yellow ||| on htop) and is not included in 1GB used. Also 260MB is already on swap. (which actually makes 1,3GB of used memory) If i start Firefox (or Chrome) with many tabs, it has only 1GB available and not potentially 1,5 GB (assume 0,5GB is for system). When I need more ram, swapping happens. So where is my ram? Which program is using it? How can i free it, to be available for e.g. Firefox? Gnome system monitor htop

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• Greeter login screen cropped login options in 12.04

  - by ammianus

  I have a pretty newly installed Ubuntu 12.04, using Unity. My external monitor is 1920x1080 max resolution. In the Unity desktop itself everything looks great. I have an NVidia graphics card. When I start my computer and get to the Unity greeter login screen the display is oddly formatted and the resolution seems off. It looks like a zoomed view on the larger 1920x1080 screen. As such it crops the login options off to the left hand side of the screen. So I can only just see the edge of the password box for the user I want to log in with. I can log in with one account by default by blindly typing the password, but I am unable to switch to other accounts. Is there anything I can do to fix the log in screen display so that I can see the normal login options? Note: I first noticed it when I changed my desktop background and the next time I logged in I saw the issue.

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• Partner Webcast - Oracle Taleo Cloud Service - 12 Dec 2012

  - by Thanos

  Talent Intelligence is the insight companies need to unlock the power of their most critical asset – their people. CEOs are charged with driving growth, and the one ingredient to growth that’s common across all industries and regions - both in good economic times and in bad – is people. In every economic environment, Talent Intelligence is a company’s biggest lever for driving growth, innovation and customer success. Oracle Taleo Cloud Service provides a comprehensive suite of SaaS products that help companies manage their investment in people by improving their Talent Intelligence. The Oracle Taleo Cloud Service enables enterprises and midsize businesses to recruit top talent, align that talent to key goals, manage performance, develop and compensate top performers, and turn today's best performers into tomorrow's leaders. Join us to find out more about the industry's broadest cloud-based talent management platform. Agenda: Oracle HCM Footprint Taleo value proposition Taleo quick tour Why invest in Taleo resources Demonstrating Taleo Q&A REGISTER NOW Delivery Format This FREE online LIVE eSeminar will be delivered over the Web. Registrations received less than 24 hours prior to start time may not receive confirmation to attend. Duration: 1 hour For any questions please contact us at [email protected]. Visit our ISV Migration Center blog Or Follow us @oracleimc to learn more on Oracle Technologies, upcoming partner webcasts and events. Existing content available YouTube - SlideShare - Oracle Mix.

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• Is it a must to focus on one specific IT subject to be succesful?

  - by Ahmet Yildirim

  Lately I'm deeply disturbed by the thought that I'm still not devoted to one specific IT subject after so many years of doing it as a hobby. I've been in so many different IT related hobbies since I was 12. I have spent 8 years and now I'm 20 and just finished freshman year at Computer Eng. Just to summarize the variety: 3D Game Dev. and Modelling (Acknex, Irrlicht , OpenGL, GLES, 3DSMAX) Mobile App.Dev (Symbian, Maemo, Android) Electronis (Arduino) Web.Dev. (PHP, MYSQL, Javascript, Jquery, RaphaelJS, Canvas, Flash etc.) Computer Vision (OpenCV) I need to start making money. But I'm having problem to pick the correct IT business to do so. Is it a problem to have interest in so many different IT subjects?(in business world) I'm having a lot of fun by doing all those stuff from time to time. Other than making money I also noticed that having so many different interests is lowering my productivity. But I'm still having difficulty to pick one. I'm feeling close to all those subjects (time to time).

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• Install on Acer Aspire 4752

  - by user216962

  I am at my wits end with this computer. I bought and Acer Aspire 4752 with a fully loaded version of Windows 7 on it. I prefer Ubuntu so I began to install 14.04 from USB. Got the error: [Errno 5] Input/output error This is often due to a faulty CD/DVD disk or drive, or a faulty hard disk. It may help to clean the CD/DVD, to burn the CD/DVD at a lower speed, to clean the CD/DVD drive lens (cleaning kits are often available from electronics suppliers), to check whether the hard disk is old and in need of replacement, or to move the system to a cooler environment. So I tried a different USB stick, same error. Tried different versions of Ubuntu, got the same error. I've used startup disk creator and Unetbootin to make start USB boot devices. I can boot with the USB drive and run Ubuntu that way. I even checked the hard drive using the tools in Ubuntu. Everything was fine, except it said the hard drive was hot. I tried a different hard drive. Got same error above. I ran a test with mem86, everything was fine. No matter what I do, using the USB gives me the Errno5 error. I then switched to using DVDs. Now I keep getting an uncompression error when installing Ubuntu 14.04 or 12.04. I can't figure out for the life of me why I get nothing but errors. Can anyone help?

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• Android - Efficient way to draw tiles in OpenGL ES

  - by Maecky

  Hi, I am trying to write efficient code to render a tile based map in android. I load for each tile the corresponding bitmap (just one time) and then create the according tiles. I have designed a class to do this: public class VertexQuad { private float[] mCoordArr; private float[] mColArr; private float[] mTexCoordArr; private int mTextureName; private static short mCounter = 0; private short mIndex; As you can see, each tile has it's x,y location, a color array, texture coordinates and a texture name. Now, I want to render all my created tiles. To reduce the openGL api calls (I read somewhere that the state changes are costly and therefore I want to keep them to a minimum), I first want to hand ALL the coordinate-arrays, color-arrays and texture-coordinates over to OpenGL. After that I run two for loops. The first one iterates over the textures and binds the texture. The second for loop iterates over all Tiles and puts all tiles with the corresponding texture into an IndexBuffer. After the second for loop has finished, I call gl.gl_drawElements() whith the corresponding index buffer, to draw all tiles with the texture associated. For the next texture I do the same again. Now I run into some problems: Allocating and filling the FloatBuffers at the start of each rendering cycle costs very much time. I just run a test, where i wanted to put 400 coordinates into a FloatBuffer which took me about 200ms. My questions now are: Is there a better way, handling the coordinate and color structures? How is this correctly done, this is obviously not the optimal way? ;) thanks in advance, regards Markus

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• I need an approach to the problem of preventing inserting duplicate records into the database

  - by Maurice

  Apologies is this question is asked on the incorrect "stack" A webservice that I call returns a list of data. The data from the webservice is updated periodically, so a call to the webservice done in one hour could return the same data as a call done in an hour. Also, the data is returned based on a start and end date. We have multiple users that can run the webservice search, and duplicate data is most likely to be returned (especially for historical data). However I don't want to insert this duplicate data in the database. I've created a db table in which the data is stored (most important columns are) Id int autoincrement PK Date date not null --The date to which the data set belongs. LastUpdate date not null --The date the data set was last updated. UserName varchar(50) --The name of the user doing the search. I use sql server 2008 express with c# 4.0 and visual studio 2010. Entity Framework is used as the ORM. If stored procedures could be avoided in the proposed solution, then that will be a plus. Another way of looking interpreting what I'm asking a solution for is as follows: I have a million unique records in my table. A user does a new search. The search results from the user contains around 300k of the data that is already in the db. An efficient solution to finding an inserting only the unique records is needed.

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• How do I throttle a command in a terminal window?

  - by To Do

  I needed to run convert with a lot of images at the same time. The command took quite a while but this doesn't bother me. The issue is that this command rendered my computer unusable while the command was running (for about 15 minutes). So is it possible to throttle the command by limiting resources (processor and memory) to the command, directly from the command line? This can only work if I add something to the same line before pressing Enter because once I start the process the computer slows so much that it is impossible for example to switch to "System monitor" and reduce priority. Edit: top and iotop results I managed to run top and sudo iotop >iotop.txt while doing one of these convert operations. (The iotop.txt file produced is difficult to read) Results of top: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 14275 username 20 0 4043m 3.0g 1448 D 7.0 80.4 0:16.45 convert Results of iotop: [?1049h[1;24r(B[m[4l[?7h[?1h=[39;49m[?25l[39;49m(B[m[H[2JTotal DISK READ: 1269.04 K/s | Total DISK WRITE:[59G0.00 B/s (B[0;7m TID PRIO USER DISK READ DISK WRITE SWAPIN(B[0;1;7m IO(B[0;7m COMMAND [3;2H(B[m2516 be/4 username 350.08 K/s 0.00 B/s 0.00 % 0.00 % zeitgeist-datahub 7394 be/4 username 568.88 K/s 0.00 B/s 77.41 % 0.00 % --rendere~.530483991[5;1H14275 idle username 350.08 K/s 0.00 B/s 37.49 % 0.00 % convert S~f test.pdf[6;2H2048 be/4 root[6;24H0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/3:2] [5G1 be/4 root[7;24H0.00 B/s 0.00 B/s 0.00 % 0.00 % init Furthermore, even after the process ends, the computer does not return to the previous performance. I found a way around this by running sudo swapoff -a followed by sudo swapon -a

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