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• Loadbalancing Questions

  - by Van Holtz

  I have been learning networking for about 4 months. Wrote a single standalone Multiplayer server and succeeded with authoritative approach. Now I want to extend it by splitting the single server into clusters to allow even more players to log in to avoid latency issues. Now I have protyped the Loadbalancing server and its running pretty good so far. This is my architecture, I have a master server which acts as a proxy, every sub servers(chat, login, game) connect to the master server as well as all the clients. when a client connects, Client Request: Send Request - MS(Master) - Decides which SS(SubServer) to forward to - Forwards Request to SS - SS - Analyze Message - Send Response to MS - Decides which Client to forward to - Forwards Response to Client Well, it looks like its going through lots of stages. it takes double the time to process the message than a single server approach. i feel like my model isnt the best or i may be wrong. is there any better model or the one they use in professional games? I still want a Master-SubServer approach. I just want to clarify that I'm going in the right direction before writing all my codes. Thanks for any answer :)

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• RTS Game Style Application [closed]

  - by Daniel Wynand van Wyk

  My question may seem somewhat odd, but I hope that my specifications will clarify EXACTLY what it is that I am after. I need some help choosing the right tooling for a particular endeavour. My background is in desktop application development and large back-end systems. I have worked primarily on the Microsoft stack using C# and the .Net framework. My goal is to develop a 2D, RTS style, interactive office simulation. The simulation will model various office spaces, office equipment, employees and their interactions with one another. The idea is to abstract the concept of an office completely. Under the hood the application will do many things that are nothing like a game. This includes P2P networking, VPN tunnelling, streaming video, instant messaging, document collaboration, remote screen sharing, file-sharing, virus scanning, VOIP, document scanning, faxing, emailing, distributed computing, content management and much more! A somewhat similar thing has been attempted by IBM, where they created a virtual office in second life. If their attempt was a game, the game-play would be notably horrible, to say the least! The users/players will drive and control my application through the various objects modelled in the simulation. A single application capable of performing all of these various tasks would be a nightmare to navigate for even the most expert user. Using the concept of a game, I can easily separate functionality by assigning them to objects that relate 1-1 with their real world counter-parts. This can greatly simplify computing for novice users, with many added benefits in terms of visibility, transparency of process and centralized configuration. My hope is to make complex computing tasks accessible to all kinds of users and to greatly reduce the cognitive load associated with using the many different utilities and applications inside office settings. The complexity is therefore limited to the complexity of the space in which you find yourself. I want the application to target as many platforms as possible and run on computers that have no accelerated graphics capabilities. The simulation won't contain any of the fancy eye-candy you find in modern games, to the contrary, my "game" will purposefully be clean and simple. The closest thing I could imagine would be an old game like "Theme Hospital" or the first instalment of "The Sims". All the content will be pre-created and not user-generated like Second Life. New functionality will be added via a plugin system. Given my background and nature of my "game", I would like to spend most of my time writing code that does not have to do with the simulated office, as the "game" is really just a glorified application menu. I have done much reading about existing engines, frameworks and tools. I need the help of an experienced game developer who has tried and tested various products over the years who can guide me in the right direction given my very particular needs. I would appreciate any help I can get!

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• System resets to login screen spontaneously

  - by Bart van Heukelom

  Now I'm experiencing spontaneous resets of the desktop environment (when logged in and working normally), where the screen will go black, then reset to the login screen. The resets appear to be random, though there is a chance it occurs more when using Nautilus. The screen goes black instantly, e.g. there is nothing like a disappearing launcher or window borders. Where can I begin finding the cause? (Note: I've recently upgraded from 11.04 to 11.10, then 12.04.)

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• Expiring timed actions a good idea?

  - by Bart van Heukelom

  We have an online game where players sometimes have to wait a while (say 30 minutes) before a process they intiated completes. This encourages them to come back later. An example of this is growing crops in Farmville or basically any action in the Sims Play4Free. Now, however, there is the idea to let these processes expire, so if the player doesn't 'reap' them in time (e.g. within 4 hours) they are aborted. I'm a bit sceptical about this. How will this make players come back more often? Is not the reward of reaping the process enough for that? Can we expect players to fit their daily schedule around our game, maybe even set the alarm clock at night? Won't this just cause players to give up on starting these processes in the first place? I realise this may be too subjective for this site, so I'll end with a concrete question: Do (m)any other online free-to-play games employ this technique?

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• sudo: unable to resolve host ubuntu-server

  - by Manfred Van de Waarsenburg

  I have a problem with sudo. Every time when I trying to use sudo I got this problem: sudo: unable to resolve host ubuntu-server My /etc/hosts file: 127.0.0.1 localhost 127.0.1.1 ubuntu-server # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes FF02::2 ip6-allrouters /etc/hostname gives: ubuntu-server I think there is some other setting that causes the unable to resole host, but I cannot find these.

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• Which parallel pattern to use?

  - by Wim Van Houts

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

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• Easy road from DisplayObject to Molehill?

  - by Bart van Heukelom

  I have a finished Flash game which is rendered using the built-in display tree, i.e. Bitmaps contained in Sprites (and a text here and there, few vector graphics, and one bitmap-filled shape). For extra performance, I'd like it to use Molehill for rendering, but that's not possible out of the box. What's the easiest way to make this game use Molehill when available, but fall back to the current method if it's not available?

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• Failed to download repository information

  - by Bob Van Elst

  When i clicked check this error message came up. But it does not come up when update manager strarts automatically. When you open update manager this error comes up. Any ideas on how to fix it? Details: *W:GPG error: (http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FC8CA6FE7B1FEC7C, W:Failed to fetch (http://ppa.launchpad.net/jonabeck/ppa/ubuntu/dists/precise/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch (http://ppa.launchpad.net/jonabeck/ppa/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found , W:Failed to fetch (http://ppa.launchpad.net/jonabeck/ppa/ubuntu/dists/precide/main/source/Sources 404 Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead.*

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• ubuntu-overlay-scrollbars set to false shows no arrows in several cases

  - by Willem van Gerven

  I'm running 12.04, and prefer the more conservative style "normal" scrollbars over the overlay scrollbars. I have set them to false in the terminal: gsettings set org.gnome.desktop.interface ubuntu-overlay-scrollbars false However after doing so, with some apps (e.g. Nautilus, Document Viewer) my scrollbars only view a vertical bar, but no arrows on the top and bottom to scroll up and down. With some programs these are shown though, for instance Gummi and Texmaker. It would make a big difference (for instance when having to scroll pdf documents containing several hundreds of pages) to have those arrows reinstated. Is there any way to make this work?

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• Rendering only a part of the screen in high detail

  - by Bart van Heukelom

  If graphics are rendered for a large viewing angle (e.g. a very large TV or a VR headset), the viewer can't actually focus on the entire image, just a part of it. (Actually, this is the case for regular sized screens as well.) Combined with a way to track the viewer's eyes, you could theoretically exploit this and render the graphics away from the viewer's focus with progressively less details and resolution, gaining performance, without losing perceived quality. Are there any techniques for this available or under development today?

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• Directing Multiple ccTLD's to 1 gTLD with a country specific subdirectory?

  - by Pascal Van Opzeeland

  We have multiple ccTLDomains and are thinking about how to best combine these into one. We want to do this to focus our link building efforts. We are running a website through which we offer a software-as-a-service. Therefore we could potentially sell to any country in the world. However, Germany is our most important market. We currently have a .com, .de, .nl. and .pl domain. All these domains have a high amount of unique content pages. What we are planning is to change everything to .com with language-based subdirectories, so .com/en/, .com/de/, etc. I have two questions concerning this issue: 1) How much of an advantage does a ccTLD have over a gTLD with country specific subdirectories in search rankings? So let’s say .de versus .com/de/? 2) How could we best redirect the visitors of our old ccTLD’s to our gTLD’s subdirectories? We would like to loose as few search engine rankings as possible. Thank you for your help.

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• HP 655 notebook (ubuntu 12.04) keeps consuming energy after closing the lid

  - by Bastian van Binsbergen

  I am unable to change power settings so that when I close the lid the battery stops consuming energy. There are three options in the power settings menu: When the screen is closed: 1 Do nothing 2 Pause 3 Sleep First I could not change anything. I see all the options but I could not click on option 2 and 3. (grey text instead of black) I already made it possible to put in to sleep mode. But I can't pause (suspend) the laptop. Anyone an idea?

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• Package denyhosts in Ubuntu Trusty Tahr is deleted: temporary or forever?

  - by Kees van Dieren

  While doing a test-upgrade of our Ubuntu server to 14.04, I found that the package DenyHosts is no longer available. Installing it gives following error: apt-get install denyhosts Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package denyhosts Apparently it has been deleted, according to launchpad. Will Denyhosts be available in the final release of Ubuntu 14.04?

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• JQueryMobile - Problems with dialog boxes [closed]

  - by Richard van Hees

  I'm programming in JQueryMobile, but I can't seem to get some things as I want. First it's good to tell I am mostly programming in a multi-page template. I have a login function in the web based app. The idea is that the user sees he's not logged in and the user can click on the button to log in. A dialog box pops up, in which the user can enter his credentials. This dialog box is in front of the previous page, in my case just index.php. The page for profile is at profile.php#profile. In this case the url for the dialog box is index.php#profile&ui-state=dialog. Don't ask me why, that's how JQueryMobile works, I guess. Anyway, after the user clicks on 'Login' in the pop-up, I want a new dialog to pop-up in which it says you are logged in and I want the content of the page behind it (index.php#profile) to refresh. Of course I want this all to move very smooth and no refreshing of the whole page, to prevent loading time and thus a blank screen for a second. In short: User not logged in Clicks on login Dialog pops up with form Clicks login New dialog pops up with 'success' (or whatever) in the same style as the previous dialog Clicks ok Page behind the dialogues has been refreshed without user noticing Also another thing that doesn't really work out for me: I can't seem to get a dialog to pop up, triggered by an action in another dialog. It just appears as a normal page.

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• Snow Leopard Server. How to create Group Blog

  - by Boris

  I was able to run group and private Wiki in no time, but now i need to run Group Blog and apple manual says that you can run Group Blog, but I am only getting private blogs, which is not what I need. Appreciate any suggestion.

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• restore content database in sharepoint server 2007

  - by Boris

  I have a site collection set up at web app running at port 80. I have made the backup of the site collection content db using stsadm.exe tool. Now, I want to restore that backup as a new content db of a different site collection - the one set up at web app running at port 500. I have done the following: Created a backup Created new web app at port 500 (I did not create a site collection for this web app) I have removed the content db of that new web app using Central Administration I have run the stsadm.exe -o addcontentdb -url webapp-at-port-500 -databasename Command is successfully completed, however when I check the Content Database page for that web app, it says that the Number of Sites is 0! Also, when I try to open http://webapp-at-port-500, I get the error saying that the webpage cannot be found. Could anyone please help me, it's driving me crazy. Thanks.

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• Setting the view of the toolbar to Large icons creates a gap in the Windows 7's taskbar

  - by Boris

  If you add a custom toolbar in the Windows 7 taksbar and set the toolbar view to Large Icons (and the icons in the toolbar are not set to Use small icons), the height of the taskbar unexpectedly increases by around 5 pixels, which makes a rather stupid gap at the bottom of the screen. If the option Use small icons is used for the taskbar appearance, the height of the taskbar is normal. It appears that the programmers at Microsoft were not very meticulous while designing the Windows 7 UI; it is obviously a bug. I was wondering if there is a registry hack to fix this or if anyone knows any solution to the problem, except for the obvious one: "use the small icons"? Thanks.

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• Webcam becomes "Unknown Device" after Windows Messenger 2011 is installed

  - by Boris

  I have Sony VAIO VGN-NS290J laptop. I installed Windows 7 Ultimate 64-bit. I was able to find drivers for all hardware without any problems. Recently, I installed Microsoft Windows Live Essentials 2011, i.e. Windows Live Messenger 2011. Ever since that application is running on my computer, my webcam is not recognized by the OS any more. It is listed as the "Unknown Device" and placed in the Universal Serial Bus controllers group in the Device Manager. There don't seem to be any drivers for this webcam. It's a standard Sony Motion Eye web camera and Sony does not offer any drivers for it. There is one application to download that utilizes the camera, but there are no drivers (and the system is showing the same behavior regardless of the presence of the application). It happens from time to time that the webcam becomes recognized by the OS again, after a couple of restarts; but not always. Then it becomes unknown again. I am absolutely positive that this issue is caused by the Windows Live Messenger 2011, because same symptoms caused the same effects before. I wish to be able to continue to use this software, but also to use my webcam. I was wondering if anyone had a similar issue and if there is a way to fix it. Thanks for all the help, I appreciate it. Update: I have discovered a pattern - if the camera goes astray, restarting the machine does not bring it back; but switching the computer off and turning it back on does. Every time! This is getting super complicated :)

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• How to install SQL Server 2008 32 bit to Windows 2003 Server 64 bit?

  - by Boris

  How to install SQL Server 2008 32 bit to Windows 2003 Server 64 bit?

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• Webcam becomes "Unknown Device" after Windows Messenger 2011 is installed

  - by Boris

  I have Sony VAIO VGN-NS290J laptop. I installed Windows 7 Ultimate 64-bit. I was able to find drivers for all hardware without any problems. Recently, I installed Microsoft Windows Live Essentials 2011, i.e. Windows Live Messenger 2011. Ever since that application is running on my computer, my webcam is not recognized by the OS any more. It is listed as the "Unknown Device" and placed in the Universal Serial Bus controllers group in the Device Manager. There don't seem to be any drivers for this webcam. It's a standard Sony Motion Eye web camera and Sony does not offer any drivers for it. There is one application to download that utilizes the camera, but there are no drivers (and the system is showing the same behavior regardless of the presence of the application). It happens from time to time that the webcam becomes recognized by the OS again, after a couple of restarts; but not always. Then it becomes unknown again. I am absolutely positive that this issue is caused by the Windows Live Messenger 2011, because same symptoms caused the same effects before. I wish to be able to continue to use this software, but also to use my webcam. I was wondering if anyone had a similar issue and if there is a way to fix it. Thanks for all the help, I appreciate it. Update: I have discovered a pattern - if the camera goes astray, restarting the machine does not bring it back; but switching the computer off and turning it back on does. Every time! This is getting super complicated :)

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• How to restart boot Windows 7 after upgrading to a SSHD on SONY VAIO with recovery discs?

  - by Boris Okun

  The original HDD on my Sony VAIO still works, but has a damaged sector 0 and I was constantly prompted to replace the HDD because of the imminent failure. I created recovery discs as instructed, used a USB external HDD for complete back up (including Windows image back up). After installing the SSHD and using recovery discs to upload Windows and boot, I am getting the Windows welcome screen. Right after that, I'm getting the following message: Windows couldn't complete the installation. To install Windows on this computer, restart the installation. I have tried repeating the process many times all kinds of different ways and I still receive the same message. Also, when I tried to change to partitioning as the other option offered, I get the message: Windows Setup could not configure Windows to run on this computer's hardware. All troubleshooting for hardware and PCU came out solid. I tried to load the image back up from the external drive, but can't load the driver. The computer doesn't see it. Does anyone have a clue or has encountered something similar?

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• How to Run vnc4server on Ubuntu in Certain Resolution?

  - by Boris Pavlovic

  There's a headless Ubuntu instance used as a host for our build server. I have some UI code that requires some graphical output. Installing a vnc4server and redirecting a DISPLAY to it worked like a charm. Not that my UI tests are running but test scripts can take screen shots. Problem is that I need to set the resolution that vnc4server uses to serve the graphical content. Does anybody know how to configure it on Ubuntu server?

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• Is it possible to trick iTunes treating an external HD as an iPod?

  - by Boris Pavlovic

  I keep my music collection on my iPod, but since I got my first iPhone two and a half years ago I have quit using the iPod as a portable music device. It's just an external HD. Benefit of having it as an external HD is that when it's connected to some other computer iTunes can play its music and update iTunes database. It would be nice if I could copy data from the iPod to an external USB HD and give away the iPod to somebody who doesn't have one.

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• How do I execute a shell-command in background?

  - by Adobe

  Here's a simple defun to run a shell script: (defun bk-konsoles () "Calls: bk-konsoles.bash" (interactive) (shell-command (concat (expand-file-name "~/its/plts/goodies/bk-konsoles.bash ") (if (buffer-file-name) (file-name-directory (buffer-file-name))) " &") nil nil)) If I start a program with no ampersand - it start the script, but blocks emacs until I close the program, if I don't put ampersand it gives error: /home/boris/its/plts/goodies/bk-konsoles.bash /home/boris/scl/geekgeek/: exited abnormally with code 1. Edit: So now I'm using: (defun bk-konsoles () "Calls: bk-konsoles.bash" (interactive) (shell-command (concat (expand-file-name "~/its/plts/goodies/bk-konsoles.bash ") (if (buffer-file-name) (file-name-directory (buffer-file-name))) " & disown") nil nil) (kill-buffer "*Shell Command Output*")) Edit 2: Nope - doesn't work: (defun bk-konsoles () "Calls: bk-konsoles.bash" (interactive) (let ((curDir default-directory)) ;; (shell-command (concat "nohup " (expand-file-name "~/its/plts/goodies/bk-konsoles.bash ") curDir) nil nil) (shell-command (concat (expand-file-name "~/its/plts/goodies/bk-konsoles.bash ") curDir "& disown") nil nil) (kill-buffer "*Shell Command Output*"))) keeps emacs busy - either with disown, or nohup. Here's a script I'm running if it might be of help: bk-konsoles.bash

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• Silverlight Cream for March 06, 2011 -- #1054

  - by Dave Campbell

  In this Back from the Summit Issue, I am overloaded with posts to choose from. Submittals go first, but I'll eventually catch up... hopefully by MIX :) : Ollie Riches(-2-), Colin Eberhardt, John Papa, Jeremy Likness, Martin Krüger, Joost van Schaik, Karl Shifflett, Michael Crump, Georgi Stoyanov, Yochay Kiriaty, Page Brooks, and Deborah Kurata. Above the Fold: Silverlight: "ClassifiedCabinet: A Quick Start" Georgi Stoyanov WP7: "Easy access to WMAppManifest.xml App properties like version and title" Joost van Schaik Multiple: "Flashcards.Show Version 2 for the Desktop, Browser, and Windows Phone" Yochay Kiriaty Shoutouts: Mohamed Mosallem delivered an online session at the Second Riyadh Online Community Summit: Silverlight 4.0 with SharePoint 2010 John-Daniel Trask posted about a release of a new set of tools released for WP7 development... there's a free trial, so definitely worth a look: Mindscape Phone Elements released! From SilverlightCream.com: WP7Contrib: Trickling data to a bound collection Ollie Riches submitted a couple links... first up is this on a way they found to decrease the load on a data template in WP7 to get under the 90 mb limit and then added their solution to the WP7Contrib lib. WP7Contrib: Why we use SilverlightSerializer instead of DataContractSerializer Ollie Riches' next submittal compares the performance of the SilverlightSerializer & DataContractSerializer on the WP7 platform. MVVM Charting – Binding Multiple Series to a Visiblox Chart Colin Eberhardt sent me this post where he describes binding multiple series to a chart with no code-behind... great long multi-phase tutorial all with source. Silverlight TV 64: Dive into 64bit Support, App Model and Security John Papa has Nick Kramer of the Silverlight team up for his latest Silverlight TV episode, discussing some cool new Silverlight stuff: 64-bit support, multiple windows, etc. Building a Windows Phone 7 Application with UltraLight.mvvm Jeremy Likness has a pre-summit tutorial up on his UltraLight.mvvm project, and how he would use it to build a WP7 app... great to meet you, Jeremy! How to: Storyboard only start with the conspicuousness of the application in the browser window Martin Krüger continues his Storyboard startup solutions with this one about what to do if the Silverlight app is small or simply an island on an html page. Easy access to WMAppManifest.xml App properties like version and title Joost van Schaik posted about the WP7 manifest file and how you can get access to that information at runtime... why you ask? How about version number or title? Be sure to read the helpful hints in the last paragraph too! Mole 2010 Released Karl Shifflett, Josh Smith, and others have released the latest version of Mole... well worth the money in my opinion, if only it worked for Silverlight! (not their fault) Changing the Default Windows Phone 7 Deployment Target In Visual Studio 2010 Michael Crump points out an annoyance with the 2011 WP7 tools update... VS2010 defaults to the device rather than the emulator... and he shows us how to get it pointed back to the emulator! ClassifiedCabinet: A Quick Start Georgi Stoyanov posted a QuickStart to a 'ClassifiedCabinet' control posted on CodePlex... check out the demo first, you'll want to read the article after that. He builds a simple project from scratch using the control. Flashcards.Show Version 2 for the Desktop, Browser, and Windows Phone Yochay Kiriaty has a post up about FlashCards.Show version 2 that he worked on with Arik Poznanski and has it now running on the desktop, browser, and WP7, plus you get the source... I've been wanting to write just such an app for WP7, so hey... this saves me some time! A Simple Focus Manager for Jounce Applications Page Brooks has a post up about Jeremy Likness' Jounce... how to set focus to a particular control when a view loads. Silverlight Charting: Formatting the Axis Deborah Kurata is continuing her charting series with this one on setting axis font color and putting the text at an angle... really dresses up the chart! Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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