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• Setting up a GUI-based libvirt VM

  - by LibertasMens

  I am attempting to create a virtual machine using libvirt that will have a GNOME GUI and remote accessibility. I have successfully set up the VM to run, but I am unable to access it remotely. The command issued to build the VM: sudo vmbuilder kvm ubuntu --suite=precise --flavour=generic --arch=amd64 --mirror=http://de.archive.ubuntu.com/ubuntu -o --libvirt=qemu:///system --part=/usr/xxxx/vmbuilder.partition --templates=/usr/xxxx/mytemplates --addpkg=nano --addpkg=unattended-upgrades --addpkg=acpid --firstboot=/usr/xxxx/boot.sh --cpus=2 --mem=4096--user=xxxx --name=xxxx --pass=xxxx --hostname=xxxx --bridge=br0 My intent is to have a virtual machine that my client can remotely access with a GUI.

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• Class Versus Struct

  - by Prometheus87

  In C++ and other influenced languages there is a construct called Structure (struct) and we all know the class. Both are capable of holding functions and variables. some differences are 1. Class is given memory in heap and struct is given memory in stack 2. in class variable are private by default and in struct thy are public My question is that struct was somehow abandoned for Class. Why? other that abstraction, a struct can do all the same stuff a class does. Then why abandon it?

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• OpenWonderland goes to Europe

  - by user12652314

  Past my day job, I also have the privilege of being Vice President and Member of the Board of the OpenWonderland Foundation (Formerly Project Wonderland for ex-Sun folks). It's great to see the progress Wonderland is making as the platform-of-choice for open source collaborative 3-D virtual worlds built in Java. The upcoming and first european IE Summit in Madrid will show a number of projects and innovations for virtual and game-based learning. I also dropped Ultan a note after learning about the Gamification of Oracle Apps to see if collaborating with kids and schools is an area we can work together on to improve kids engagement and learning experiences online. Stay tuned.

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• What's the difference or purpose of a file format like ELF when flat binaries take up less space and can do the same thing?

  - by Sinister Clock

  I will give a better description now. In Linux driver development you need to follow a specification using an ELF file format as a finalized executable, i.e., that right there is not flat, it has headers, entry fields, and is basically carrying more weight than just a flat binary with opcodes. What is the purpose or in-depth difference of a Linux ELF file for a driver to interact with the video hardware, and, say, a bare, flat x86 16-bit binary I write that makes use of emulated graphics mode on a graphics card and writes to memory(besides the fact that the Linux driver probably is specific to making full use of the hardware and not just the emulated, backwards compatible memory accessing scheme). To sum it up, what is a difference or purpose of a binary like ELF with different headers and settings and just a flat binary with the necessary opcodes/instructions/data to do the same thing, just without any specific format? Example: Windows uses PE, Mac uses Mach-O/PEF, Linux uses ELF/FATELF, Unix uses COFF. What do any of them really mean or designate if you can just go flat, especially with a device driver which is system software.

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• Is the tap-to-click issue solved

  - by AWE

  I'm just an average Joe when it comes to computing (maybe less then the average Joe) but I hate tap-to-click. In system and settings there is no touchpad tab? Is it true that this has been fixed? I'm using Dell inspiron N5110 xinput list: ? Virtual core pointer id=2 [master pointer (3)] ? ? Virtual core XTEST pointer id=4 [slave pointer (2)] ? ? PS/2 Generic Mouse id=13 [slave pointer (2)] This is really strange because Dell is one of the top manufacturers in laptops and Ubuntu one of the top distros in Linux and Canonical claims that they are working closely with Dell.

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• GlassFish 4.0 Virtualization Progress - VirtualBox

  - by alexismp

  Wouldn't it be nice if you could spawn GlassFish instances as VirtualBox virtual machines? Well now with early versions of GlassFish 4.0 you can! This page on the GlassFish Wiki documents the steps to get this to work. It walks you through the various VirtualBox (network and services) and GlassFish configuration steps including the creation of VDI templates (typically JeOS images) to finally create a virtual machine on the fly, as part of the typical GlassFish deployment process. The more general virtualization support in GlassFish is discussed in this other Wiki page. Earlier demonstrations of GlassFish.next prototypes or early milestone builds showed support for KVM, "laptop mode" and OVM as well as community involvement from Serli, speaking of which this slide-deck is a good summary of what we're trying to achieve in the GlassFish 4.0 IMS (IaaS Management Service).

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• 12.04 LTS won't install from CD

  - by Rob Hays

  I've been trying to install 12.04 LTS onto a Dell with a PIII from CD. Booting from the CD the install gets through the "Who are you" process, begins copying files. The progress bar gets as far as the last period in "Copying files...". The box clears, and an error box comes up "The installer has encountered an unrecoverable error. A desktop session will now be run so that you may investigae the problem or try installing again." When I try to install from this desktop session, the install gets to the same point, the copying files box closes, and then just stops. The pointer is busy, the cd drive spins up occaisonally with no data transfer, no hard drive activity. When I boot from the CD and access the disk boot menu, the disk checks good, memory checks good ( I upgraded the original memory to 512 mb). I also updated the bios to the newest from Dell. This is an older L866r, but should meet the requirements.

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• What is a right datatype in C++ for OpenGL scene representation with use of GLSL

  - by Rarach

  I am programming in C++ OpenGl with GLSL. Until now I have been using a data structure that is composed of std::vector filled with structures of vertexes and with their parameters (position , normal, color ...) as a global variable for all the code. My question is, as I am using VBOs for drawing - is this a good approach to this problem? I am asking because I happen to have a lot of memory related trouble with this structure. I am trying to generate a terrain with a lot of vertices - more than 1 million. This seems to work, but as I refill the buffer I get memory related issues (crushes that occur, more or less randomly). So again the question is, is this a good data structure to use / and look for the faults in my code, or should I change to something else? Or what data structure would be advisable?

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• Citrix SDK: Where to start? [closed]

  - by Bob Dole

  I'm needing to start hacking around the Citrix SDK and am trying to figure out where to start. I'm wanting to basically find a way to pass data from the client to the server and figure out how to open an application on the citrix client. I see there is a XenApp SDK, and Virtual Channel SDK but really don't know which one I need to start with. I have a Citrix development virtual server set up, but am unsure how to get started. Does someone know of a good site/tutorial on how to get started with the various Citrix API's quickly?

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• Using static in PHP

  - by nischayn22

  I have a few functions in PHP that read data from functions in a class readUsername(int userId){ $reader = getReader(); return $reader->getname(userId); } readUserAddress(){ $reader = getReader(); return $reader->getaddress(userId); } All these make a call to getReader() { require_once("Reader.php"); static $reader = new Reader(); return $reader; } An overview of Reader class Reader{ getname(int id) { //if in-memory cache exists for this id return that //else get from db and cache it } getaddress(int id) { $this->getname(int id); //get address from name here } /*Other stuff*/ } Why is class Reader needed The Reader class does some in-memory caching of user details. So, I need only one object of class Reader and it will cache the user details instead of making multiple db calls. I am using static so that it the object gets created only once. Is this the right approach or should I do something else?

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• Allow visitor to print something they bought only 1 time

  - by steakbbq

  I am doing a website that needs to only let the customer print out what they bought 1 time. There are websites that currently do this and they mentioned Adobe Flash Player, Adobe AIR and the Sheet Music Plus AIR application. We would need to block programs like adobe distillation and any virtual printers while only allowing an instant print after purchase. I am not an adobe air developer. Would their be any other ways to accomplish this and what would be the easiest. Thank you. Would their be a way to not allow printing to a virtual printer ie adobe pdf?

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• Database Insider - June 2014 issue now available

  - by Javier Puerta

  The June issue of the Database Insider newsletter is now available. (Full newsletter here) NEWS June 10: Oracle CEO Larry Ellison Live on the Future of Database Performance At a live webcast on June 10 at Oracle’s headquarters, Oracle CEO Larry Ellison is expected to announce the upcoming availability of Oracle Database In-Memory, which dramatically accelerates business decision-making by processing analytical queries in memory without requiring any changes to existing applications.Read More New Study Confirms Capital Expenditure Savings with Oracle Multitenant A new study finds that Oracle Multitenant, an option of Oracle Database 12c, drives significant savings in capital expenditures by enabling the consolidation of a large number of databases on the same number or fewer hardware resources.  Read More Read full newsletter here

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• Have You Downloaded SQL Server 2012 Evaluation Edition? Why Not?!

  - by andyleonard

  I am installing SQL Server 2012 Evaluation Edition on a virtual machine as I type. You can do this. Here’s one way: Grab some virtual machine software. I like Oracle VirtualBox . It’s cool. It’s free. Install VirtualBox. Download the 180-day free trial of Windows Server 2008 R2 . Also cool. Also free. Once Windows Server 2008 R2 is downloaded, build a VirtualBox VM. Download and install SQL Server 2012 Evaluation Edition ! That’s all there is to it. You can get started today, no need to wait until...(read more)

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• ideas on multiplayer games which include lots of collaboration?

  - by user494461

  For my master thesis I wanted to design a small multiplayer game which includes more than one player(maybe 5), has 2-3 players collaborating at a time to achieve some task. The most important thing is realistic simulation of the movable objects in the scene which more than one player should simultaneously interact with. I would also prefer large virtual environments (VEs) like mmogs where groups of players are interacting in different areas of the VE. tasks for players should include 2-3 players touching movable objects at same time. e,g, a very basic task can be users lifting a cube together and pushing it through a hole I am not new to designing virtual environments with openGL, but have never designed games before and rarely play other than few of my favorite ones like Fifa. I wanted some ideas on what kind of games should I look at which should help me with ideas for my tasks for the users to gain points and win in games? any current indie games which might inspire me?

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• Oracle Exadata X3 Launch Webcast

  - by Cinzia Mascanzoni

  Available on-demand, this webcast covers everything your partners need to know about Oracle’s next-generation database machine. They will learn how to improve performance by storing multiple databases in memory, lower power and cooling costs by 30%, and easily deploy a cloud-based database service. Exadata X3 combines massive memory and low-cost disks to deliver the highest performance at the lowest cost. Partners won’t want to miss this webcast. Invite them to watch today! View and share the replay.

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• Distorted choppy audio in Precise

  - by Misery

  After installing Precise on my PC, some problems with soud occure. While using Lucid there were no problems. The sound is choppy and distorted in low tones range. As I absolutely have no experience in setting/testing and doing anything with Audo Devices I need help even to diagnose the problem. update: sudo lshw -c multimedia *-multimedia description: Audio device product: Radeon X1200 Series Audio Controller vendor: Hynix Semiconductor (Hyundai Electronics) physical id: 5.2 bus info: pci@0000:01:05.2 version: 00 width: 64 bits clock: 33MHz capabilities: pm msi bus_master cap_list configuration: driver=snd_hda_intel latency=32 resources: irq:19 memory:fdafc000-fdafffff *-multimedia description: Audio device product: SBx00 Azalia (Intel HDA) vendor: Hynix Semiconductor (Hyundai Electronics) physical id: 14.2 bus info: pci@0000:00:14.2 version: 00 width: 64 bits clock: 33MHz capabilities: pm bus_master cap_list configuration: driver=snd_hda_intel latency=32 resources: irq:16 memory:fe024000-fe027fff update 2: It has something to do with the volume. If the audio is quiet it is not choppy, if the sound is loud then it begins to be choppy. Regards, Misery

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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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• Dell b1160w not working in 14.04

  - by mission007

  I originally installed the dell b1160w printer on ubuntu 12.04. It worked as expected. A few months ago I upgraded to ubuntu 14.04 and now I can't get the printer to work. I looked at the driver information on the dell site. They have not updated their driver since 2013 so 12.04 is the latest version with a supported driver. Is there a work around for this problem, like a generic driver that I can use or a way to install whatever printer interface ubuntu 12.04 was using? I have a windows virtual box. I can get it to work through there, but it's inconvenient to pull up my virtual box and transfer the files over to it anytime I want to print.

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• My computer boots up with Ubuntu: How can I tell what's on my hard disk?

  - by Larry Harson

  I've acquired an old laptop (Acer TravelMate 4050 with an Italian keyboard) that boots up with the following options: Ubuntu, with Linux 3.0.0-12-generic Ubuntu, with Linux 3.0.0-12-generic (recovery mode) Memory test (memtest86+) Memory test (memtest86+, serial console 115200) When I choose the first option, the screen just goes blank with a flashing cursor. But I can go into grub command mode by typing 'c'. Now, I want to know what operating system is installed, and the files stored on my computer, so how do I do this? What can I do to maximise the use of this computer in its current state?

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• Detect Subscribers To Event In Real Time

  - by xyz247

  I'm using C++ in the QT framework to write an application that detects an application running in memory. I can use the FindWindow method, but that requires that I know the windows title before hand. What would be the best method for identifying behavior of the application in memory to match it to a title? For example, if I know (before scanning) that a given application subscribes to the OnKeyPress event, is it possible to hook to it that method, detect all of the subscribers and enumerate them to find the application i'm looking for? If so, how would I go about doing that without integrating into the kernel? Thanks in advance for all the responses.

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• Am I violating LSP if the condition can be checked?

  - by William

  This base class for some shapes I have in my game looks like this. Some of the shapes can be resized, some of them can not. private Shape shape; public virtual void SetSizeOfShape(int x, int y) { if (CanResize()){ shape.Width = x; shape.Height = y; } else { throw new Exception("You cannot resize this shape"); } } public virtual bool CanResize() { return true; } In a sub class of a shape that I don't ever want to resize I am overriding the CanResize() method so a piece of client code can check before calling the SetSizeOfShape() method. public override bool CanResize() { return false; } Here's how it might look in my client code: public void DoSomething(Shape s) { if(s.CanResize()){ s.SetSizeOfShape(50, 70); } } Is this violating LSP?

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• Multiple vulnerabilities in Firefox web browser

  - by chandan

  CVE DescriptionCVSSv2 Base ScoreComponentProduct and Resolution CVE-2011-3062 Numeric Errors vulnerability 6.8 Firefox web browser Solaris 11 11/11 SRU 9.5 Solaris 10 SPARC: 145080-11 X86: 145081-10 CVE-2012-0467 Denial of service (DoS) vulnerability 10.0 CVE-2012-0468 Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability 10.0 CVE-2012-0469 Resource Management Errors vulnerability 10.0 CVE-2012-0470 Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability 10.0 CVE-2012-0471 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability 4.3 CVE-2012-0473 Numeric Errors vulnerability 5.0 CVE-2012-0474 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability 4.3 CVE-2012-0477 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability 4.3 CVE-2012-0478 Permissions, Privileges, and Access Controls vulnerability 9.3 CVE-2012-0479 Identity spoofing vulnerability 4.3 This notification describes vulnerabilities fixed in third-party components that are included in Sun's product distribution.Information about vulnerabilities affecting Oracle Sun products can be found on Oracle Critical Patch Updates and Security Alerts page.

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• Register now! Oracle SDN: Software-Defined Networking in a Hybrid, Open Data Center

  - by uwes

  Take the opportunity and learn more about Oracle SDN and  OVCA in this upcoming webcast. Title: Oracle SDN: Software-Defined Networking in a Hybrid, Open Data Center Date: 19th of November 10:00 a.m. PT Speakers: S.K. Vinod and Charlie Boyle Topics that will be covered: - the benefits of Oracle SDN - how Oracle SDN interoperates with existing overlay constructs - how Oracle SDN is different from other SDNs in the market We will also discover how Oracle Virtual Networking is integrated into the latest Engineered System, Oracle Virtual Compute Appliance Click her to register The webinar will be recorded. Register to get informed when the replay is a vailable.

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• Eclipse: AVD not appearing

  - by dgood1

  I have installed the ADT bundle for 32 bit. Using Ubuntu 12.04 Updated it a bit and installed the 2.3.3 Android version. I have Eclipse Indigo. When I use the Android Virtual Machine manager, after choosing a device, I get the progress bar after pressing "Start" but it disappears when it finishes and no virtual machine appears. No errors, too. I fear it would be a problem with my RAM (Laptop's = 512(or less). Allocated to Device = 128 - 300), having been told by a teacher that the emulator requires 2 GB RAM. I would like confirmation and/or solution.

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• What is the point in using real time?

  - by bobobobo

  I understand that using real time frame elapses (which should vary between 16-17ms on average) are provided by a lot of frameworks. GetTimeElapsedSinceLastFrame, and it gives you the wall clock time. But should we use this information in basic physics simulation? It looks to me to be a bad idea. Say there is a slight lag on the machine, for whatever reason (say a virus scanner starts up). The calculations all jump, and there is no need for this. Why not use a virtual second and ignore wall clock time? For gameplay on the level of Commander Keen, shouldn't you always use the virtual second and not real-time? (Besides stopwatch timing for race games) I don't see a need to use real time and not a fixed 16ms time step.

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