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  • Can't use the hardware scissor any more, should I use the stencil buffer or manually clip sprites?

    - by Alex Ames
    I wrote a simple UI system for my game. There is a clip flag on my widgets that you can use to tell a widget to clip any children that try to draw outside their parent's box (for scrollboxes for example). The clip flag uses glScissor, which is fed an axis aligned rectangle. I just added arbitrary rotation and transformations to my widgets, so I can rotate or scale them however I want. Unfortunately, this breaks the scissor that I was using as now my clip rectangle might not be axis aligned. There are two ways I can think of to fix this: either by using the stencil buffer to define the drawable area, or by having a wrapper function around my sprite drawing function that will adjust the vertices and texture coords of the sprites being drawn based on the clipper on the top of a clipper stack. Of course, there may also be other options I can't think of (something fancy with shaders possibly?). I'm not sure which way to go at the moment. Changing the implementation of my scissor functions to use the stencil buffer probably requires the smallest change, but I'm not sure how much overhead that has compared to the coordinate adjusting or if the performance difference is even worth considering.

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  • Nvidia optimus and Steam (on 12.04)

    - by Seiryuu
    I've obtained a copy of the .deb for the Steam beta, but it was pretty disappointing to see that it simply doesn't run. Hardware - Dell XPS L502, with Nvidia Optimus I have bumblebee installed. Trying to run Steam with the Intel HD 3000 completely fails to start it. Message received Installing breakpad exception handler for appid(steam)/version(1352224866_client) followed by a crash with no other information provided. Trying to optirun steam runs the client, but as soon as it gets to the home screen, it says that the Nvidia drivers I am using are out of date (and Steam requires newer drivers to run). It's probably worth to note that it throws the same Installing breakpad... error when run with optirun, but it doesn't crash the client immediately. Any way to fix this? Also, is there a way of manually updating the drivers in bumblebee without breaking anything? Alternatively, is there a reliable way of completely disabling the Intel GPU (in order to use the Nvidia GPU exclusively)? Note: I am using Xmonad with gnome-fallback, if that makes a difference. However, when I tried everything mentioned with Unity (2d), everything was the same, so I guess it has nothing to do with the window manager in use.

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  • Linux to Solaris @ Morgan Stanley

    - by mgerdts
    I came across this blog entry and the accompanying presentation by Robert Milkoski about his experience switching from Linux to Oracle Solaris 11 for a distributed OpenAFS file serving environment at Morgan Stanley. If you are an IT manager, the presentation will show you: Running Solaris with a support contract can cost less than running Linux (even without a support contract) because of technical advantages of Solaris. IT departments can benefit from hiring computer scientists into Systems Programmer or similar roles.  Their computer science background should be nurtured so that they can continue to deliver value (savings and opportunity) to the business as technology advances. If you are a sysadmin, developer, or somewhere in between, the presentation will show you: A presentation that explains your technical analysis can be very influential. Learning and using the non-default options of an OS can make all the difference as to whether one OS is better suited than another.  For example, see the graphs on slides 3 - 5.  The ZFS default is to not use compression. When trying to convince those that hold the purse strings that your technical direction should be taken, the financial impact can be the part that closes the deal.  See slides 6, 9, and 10.  Sometimes reducing rack space requirements can be the biggest impact because it may stave off or completely eliminate the need for facilities growth. DTrace can be used to shine light on performance problems that may be suspected but not diagnosed.  It is quite likely that these problems have existed in OpenAFS for a decade or more.  DTrace made diagnosis possible. DTrace can be used to create performance analysis tools without modifying the source of software that is under analysis.  See slides 29 - 32. Microstate accounting, visible in the prstat output on slide 37 can be used to quickly draw focus to problem areas that affect CPU saturation.  Note that prstat without -m gives a time-decayed moving average that is not nearly as useful. Instruction level probes (slides 33 - 34) are a super-easy way to identify which part of a function is hot.

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  • Very slow write access to SSD disks on some Asus P8Z77 motherboards

    - by lenik
    I have Asus P8Z77-V LK motherboard, that ran Mint 13 (based on Ubuntu 12.04) just perfectly, but recently I've tried to install Mint 17 and noticed abysmal write performance. Write speed on SSD disk was about 1.5MB/sec, when it's supposed to be in 150-250MB/sec range. For write testing I've used dd if=/dev/zero of=/dev/sda bs=10M count=10 while booted up from LiveCD. I have also tested the read speed with hdparm -tT /dev/sda and got about 440MB/sec -- that's normal. I can tell, the read performance has not degraded at all and is not an issue here. Since I had a few different SSD disks and few motherboards, I've tested and tested and here are results: Asus P8H77 works fine with Mint13, has very slow write speed starting from Mint14. Asus P8Z77-V LK works with Mint13, has very slow write speed starting from Mint14. Asus P8Z77-V PRO works with Mint13, and works just fine with Mint14, 15, 16 and 17. The only difference between "PRO" version and others is that it has extra SATA controller onboard (in addition to the Z77 chipset SATA controller) providing extra 2 SATA ports. SSD disks work fine with "PRO" version when connected to the native SATA ports as well as to the ports provided by extra SATA controller, so this does not look like a hardware issue. As far as I can tell, there's something changed in the kernel while going from 3.2 to 3.5, that affects the detection of onboard SATA controller for Asus P8*77 motherboards, that screws up the write speed for SSD drives. Could anyone shed some light on how to fix this issue or, possibly, give a pointer to a more suitable place to ask this question?

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  • Convenience of mySQL over xml

    - by Bonechilla
    Currently I use XML to store specific information to correctly load a few things such as a list of specfied characters, scenes and music, Once more I use JAXB in combination with standard compression/decompression(ZIP) functionality to store a list of extrenous data. This data is called to add functionality to the character, somewhat like Skills in an RPG. Each skill is seperated into its own XML file with a grandlist which contains the names of each file with their extensions omitted and zipped in folder that gets encrypted. At first using xml was working fine however as the skill list grow i worry about its stability. I was wondering if I should begin storing the data in mySQL. Originally I planned to simply convert everything to JSON over xml but i think possibly mySQL would be a better move. Can anyone inform me of the key difference and pros and cons of each I guess i'm looking for the best way to store the data more conviently and would be easier to operate on. The data is mostly primatives and strings and the only arraylist of values i have i can just concat into a single field and parse later Edit: If I am going in the right direction with XML would it make sense to convert it to JSON and use maybe Kyro or EclipseLink JAXB (MOXy)

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  • How can I get something like Nautilus's "spatial" behaviour in 11.10 and later?

    - by Dylan McCall
    Until recently, Nautilus had an optional "spatial" mode as an alternative to its usual browser mode. Users could enable it by opening Nautilus's preferences and selecting "Open each folder in its own window." Choosing this option resulted in a stripped down interface, and folders would always open in the same place on the screen. It looked something like this: That checkbox is still there, but it doesn't do the same thing: while every folder opens in a new window, those windows are all the same size and positioned the same way. Nautilus doesn't restore the size and position of each folder, which is what spatial mode was all about. This difference really shows if someone opens a folder in a new window, and then opens the same folder again. Nautilus will create another window instead of focusing the existing window. I help someone who is currently using Ubuntu 10.04, and he will be upgrading to 12.04 in the future. He is very comfortable with Nautilus's spatial behaviour and I think he would be disappointed to lose it. Is there an alternative file manager, or perhaps some less obvious option, that will give him an interface similar to the one he is comfortable with?

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  • How to setup a Wireless Access-Point using my laptop's WiFi card?

    - by Abdul Karim Memon
    want to share my Laptops (running Ubuntu 10.10) Broadband with my Android (Galaxy Mini) running 2.2.1. Since Androids currently do not support ad-hoc networks so the "Create new wireless network.." won't help. Q1) How do i setup a Wireless Access Point using my Laptops WiFi card? Q2) What is the difference between an "ad-hoc" network and an "access point"? **abdulkarim@aK-laptop**:~$ lspci | grep ireless 03:00.0 Network controller: Atheros Communications Inc. AR9287 Wireless Network Adapter (PCI-Express) (rev 01) iw list Wiphy phy0 Band 1: Capabilities: 0x11ce HT20/HT40 SM Power Save disabled RX HT40 SGI TX STBC RX STBC 1-stream Max AMSDU length: 7935 bytes DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 8 usec (0x06) HT TX/RX MCS rate indexes supported: 0-15 Frequencies: * 2412 MHz [1] (20.0 dBm) * 2417 MHz [2] (20.0 dBm) * 2422 MHz [3] (20.0 dBm) * 2427 MHz [4] (20.0 dBm) * 2432 MHz [5] (20.0 dBm) * 2437 MHz [6] (20.0 dBm) * 2442 MHz [7] (20.0 dBm) * 2447 MHz [8] (20.0 dBm) * 2452 MHz [9] (20.0 dBm) * 2457 MHz [10] (20.0 dBm) * 2462 MHz [11] (20.0 dBm) * 2467 MHz [12] (20.0 dBm) (passive scanning) * 2472 MHz [13] (20.0 dBm) (passive scanning) * 2484 MHz [14] (disabled) Bitrates (non-HT): * 1.0 Mbps * 2.0 Mbps (short preamble supported) * 5.5 Mbps (short preamble supported) * 11.0 Mbps (short preamble supported) * 6.0 Mbps * 9.0 Mbps * 12.0 Mbps * 18.0 Mbps * 24.0 Mbps * 36.0 Mbps * 48.0 Mbps * 54.0 Mbps max # scan SSIDs: 4 Supported interface modes: * IBSS * managed * ** AP * AP/VLAN** * monitor * mesh point Supported commands: * new_interface * set_interface * new_key * new_beacon * new_station * new_mpath * set_mesh_params * set_bss * authenticate * associate * deauthenticate * disassociate * join_ibss * Unknown command (55) * Unknown command (57) * Unknown command (59) * set_wiphy_netns * Unknown command (65) * connect * disconnect

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  • Making an interactive 2D map

    - by Chad
    So recently I have been working on a Legend of Zelda: A Link to the Past clone, and I am wondering how I could handle certain map interactions (like cutting grass, lifting rocks, etc). The way I am currently doing the tilemap is with 2 PNGs. The first is the "tilemap" where each pixel represents a 16x16 tile and the (red, green) values are the (x, y) coords for the tile in the second PNG (the "tileset"). I am then using the blue channel to store collision data. Each tile is split into 4 8x8 tiles and represented by a 2 bit value (0 = empty, 1 = Jumpdown point, 2 = unused right now, 3 = blocking). 4 of these 2 bit values make up the full blue channel (1 byte). So collisions work great, and I am moving on to putting interactive units on the level; but I am not sure what a good way is to do it. I have experimented with spawning an entity for each grass and rock, but there are just WAY to many; FPS just dies even if I confine it to the current "zone" the user is in (for those who remember LTTP it had zones you moved between). It does make a difference that this is a browser-based JavaScript game. tl;dr: What is a good way to have an interactive map without using full blown entities for each interactive item?

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  • Using Apache2 to set up a basic webpage

    - by mrhatter
    I am having a problem with a test page I set up for my website. The config file (index.html) looks like this <html> <head> <title>Welcome to website.net!</title> </head> <body> <h1>Success! The website.net virtual host is working!</h1> </body> </html> Which should display a page like this in my browser when I navigate to www.mywebsite.net Welcome to website.net! Success! The website.net virtual host is working! However I get a 403 "forbidden" error when I navigate to the page. What am I missing? I have the directory installed on /var/www/mywebsite.net/public_html/index.html I have the permissions of the /var/www directory set to 755 so that others can read and exicute it but it does not seem to be working. I also have port 80 open on my iptable. The server is a VPS server if that makes a difference however I have added a DNS record for the ip address. Any help is appreciated! UPDATE: Here is my virtual host configuration file "mywebsite.net.conf" <VirtualHost *:80> # Admin email, Server Name (domain name), and any aliases ServerAdmin [email protected] ServerName www.mywebsite.net ServerAlias mywebsite.net # Index file and Document Root (where the public files are located) DirectoryIndex index.html index.php DocumentRoot /home/myusername/public/mywebsite.net/public # Log file locations LogLevel warn ErrorLog /home/mysuername/public/mywebsite.net/log/error.log CustomLog /home/myusername/public/mywebsite.net/log/access.log combined <Directory /home/myusername/public/mywebsite.net/public> Options Indexes ExecCGI Includes FollowSymLinks MultiViews AllowOverride All Order Deny,Allow Allow from all </Directory> </VirtualHost>

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  • Looking for a simple web interface with subversion support and ticket /issue tracker [closed]

    - by Stefan Andre Brannfjell
    I am working on a small project and we have a few programmers on the job. We are using subversion to commit updates and keep all developers up to date on their workstations. However, we have yet to find a suitable web interface to use for it. I have tried redmine, but that installation progress was extremely bothersome and advanced. Once I got it to work I found out that it was slow and did not meet my expectations. As well as it seems a bit complex for our needs. I would prefer to find a solution that supports lighttpd web server, however that seem to be very hard to come by, those I have found seem to only have apache support. Functionality i wish for the website: - login to an svn account - view svn logs - view & create issues, todo list etc - view svn difference Do you have any open source recommendations that I can try out? I will appreciate any kind of reply. :) Edit: I wish to host the website on our own servers.

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  • MightyMintyBoost Is a 3-in-1 Gadget Charger

    - by ETC
    If you’re looking for a versatile battery booster, this DIY 3-in-1 solar/usb/wall current charger known as the MightyMintyBoost will top of your phone, mp3 player, and other gadgets with ease. Instructables user Honus didn’t just build the MightMintyBoost to geek out and show off his electronics project skills (although it’s certainly a nifty little project to do so), he’s serious about solar power and the impact clean energy has: Apple has sold over 30 million iPodTouch/iPhone units- imagine charging all of them via solar power…. If every iPhone/iPodTouch sold was fully charged every day (averaging the battery capacity) via solar power instead of fossil fuel power we would save approximately 50.644gWh of energy, roughly equivalent to 75,965,625 lbs. of CO2 in the atmosphere per year. Granted that’s a best case scenario (assuming you can get enough sunlight per day and approximately 1.5 lbs. CO2 produced per kWh used.) Of course, that doesn’t even figure in all the other iPods, cell phones, PDAs, microcontrollers (I use it to power my Arduino projects) and other USB devices that can be powered by this charger- one little solar cell charger may not seem like it can make a difference but add all those millions of devices together and that’s a lot of energy! His MightyMintyBoost is a battery booster for devices that can charge via USB and it accepts incoming current from the solar panel on top (or, on cloudy days can be charged via a wall charger or the USB port on your computer). Hit up the link below to see his full build guide and create your own MightyMintyBoost. MightyMintyBoost [Instructables] Latest Features How-To Geek ETC Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Here’s a Super Simple Trick to Defeating Fake Anti-Virus Malware How to Change the Default Application for Android Tasks Stop Believing TV’s Lies: The Real Truth About "Enhancing" Images The How-To Geek Valentine’s Day Gift Guide Inspire Geek Love with These Hilarious Geek Valentines MyPaint is an Open-Source Graphics App for Digital Painters Can the Birds and Pigs Really Be Friends in the End? [Angry Birds Video] Add the 2D Version of the New Unity Interface to Ubuntu 10.10 and 11.04 MightyMintyBoost Is a 3-in-1 Gadget Charger Watson Ties Against Human Jeopardy Opponents Peaceful Tropical Cavern Wallpaper

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  • Obtaining a world point from a screen point with an orthographic projection

    - by vargonian
    I assumed this was a straightforward problem but it has been plaguing me for days. I am creating a 2D game with an orthographic camera. I am using a 3D camera rather than just hacking it because I want to support rotating, panning, and zooming. Unfortunately the math overwhelms me when I'm trying to figure out how to determine if a clicked point intersects a bounds (let's say rectangular) in the game. I was under the impression that I could simply transform the screen point (the clicked point) by the inverse of the camera's View * Projection matrix to obtain the world coordinates of the clicked point. Unfortunately this is not the case at all; I get some point that seems to be in some completely different coordinate system. So then as a sanity check I tried taking an arbitrary world point and transforming it by the camera's View*Projection matrices. Surely this should get me the corresponding screen point, but even that didn't work, and it is quickly shattering any illusion I had that I understood 3D coordinate systems and the math involved. So, if I could form this into a question: How would I use my camera's state information (view and projection matrices, for instance) to transform a world point to a screen point, and vice versa? I hope the problem will be simpler since I'm using an orthographic camera and can make several assumptions from that. I very much appreciate any help. If it makes a difference, I'm using XNA Game Studio.

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  • How to decide on a price for the project as a freelancer

    - by Shekhar_Pro
    I have seen similar question on this SE site but none comes close to a sure shot answer and many are rather subjective. So i am taking a website as an example to be more objective for you to decide its development price i should quote for the complete work.I would like to have specific figures. In past I have developed many projects for my classmates (Computer science and few .net) when i was in college and there i just arbitrarily quoted the price i will take depending on my mood and customer's ability to pay.. usually ranging from Rs.500 (about $10 USD) to Rs. 1500 (about $30 USD). I have also developed few websites but that was open-source and free. But this time impressed by my work i have got a client that wants to get a website developed similar to this: [ http://www.jeetle.in/ ]. So taking this website as an example tell me how much should i charge for complete work from designing to payment gateway implementation (Excluding the charge the payment gateway provider will take). Few information you might like to consider. I am the only developer on this project if that makes any difference. And i would be using ASP.Net and MSSQL Express for server side processing and jQuery on client. Time period for development offered is about 4 to 6 Weeks. Its like i know my work but not how much I'm worth

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  • Moodle 2 pages loading up to 2000% faster

    - by TJ
    On average our Moodle 2 pages were loading in 2.8 seconds, now they load in as little as 0.12 seconds, so that’s like 2333.333% faster!What was it I hear you say?Well it was the database connection, or more correctly the database library. I was using FreeTDS http://docs.moodle.org/22/en/Installing_MSSQL_for_PHP, but now I’m using the new Microsoft Drivers 3.0 for PHP for SQL Server http://www.microsoft.com/en-us/download/details.aspx?id=20098. I’m in a Windows Server IT department, and in both our live and development environments, we have Moodle 2.2.3, IIS 7.5, and PHP 5.3.10 running on two Windows Server 2008 R2 servers and using MS Network Load Balancing.Since moving to Moodle 2, the pages have always loaded much more slowly than they did in Moodle 1.9, I’ve been chasing this issue for quite a while. I had previously tried the Microsoft Drivers for PHP for SQL Server 2.0, but my testing showed it was slower than the FreeTDS driver.Then yesterday I found Microsoft had released the new version, Microsoft Drivers 3.0 for PHP for SQL Server, so I thought I’d give it a run, and wow what a difference it made.Pages that were loading in 2.8 seconds, now they load in as little as 0.12 seconds, 2333.333% faster…I have more testing to do, but so far it’s looking good, I have scheduled multi user load testing for early next week (fingers crossed).To make the change all I need to do was,download the driverscopy the relevant files to PHP\ext (for us they were php_pdo_sqlsrv_53_nts.dll and php_sqlsrv_53_nts.dll) install the Microsoft SQL Server 2012 Native Client x64 http://www.microsoft.com/en-us/download/details.aspx?id=29065 add to PHP.ini, extension=php_pdo_sqlsrv_53_nts.dll, extension=php_sqlsrv_53_nts.dllremove form PHP.ini, extension=php_dblib.dllvchange in PHP.ini, mssql.textlimit = 20971520 and mssql.textsize = 20971520change Moodle config.php, $CFG->dbtype = 'sqlsrv'; and 'dbpersist' => Trueand then reboot and test…I've browsed courses, backed up/restored some really large and complicated courses, deleted courses etc. etc. all good.Still more testing to do but, hey this is good start...Hope this helps anyone experiencing the same slowness…

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  • Today I talk about you

    - by BuckWoody
    Some time back I posted a blog entry (mirrored here and here) asking you how you design databases. Out of those responses, my own experience, studies I read, and interviews I conducted, I collected a wealth of data. Thanks for your responses. So what am I going to do with that information? Well, all along I had planned for that to be used today. I am giving a presentation at an event called “TechReady” called “How Your Customers Design Databases”. This is a Microsoft-internal event, where technical professionals like myself, salespeople, and the product team get together to talk about what has been working, what doesn’t, what is coming and hopefully (fingers crossed here) what the product team can do to help us help the SQL Server community. I’ve mentioned before that I teach database design as part of a course I run at the University of Washington. I’m also planning to give a mini-lecture from that series at TechEd 2010, so if you’re coming stop by. I’d love to meet you. So today I talk about you – thanks for the input. I hope you and I can make a difference in the product. Might take a while, but it’s nice to know your voice is being heard. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Roll a DIY Camera Jib for $25

    - by Jason Fitzpatrick
    Video gear is expensive; save your pennies by building a DIY camera jib for smooth camera movement on a budget. Over at Oliva tech they explain just how few parts you need to build their DIY jib: The guys here at the studio mocked up a simple DIY jib that is not only ridiculously inexpensive to piece together, but also very straight forward. The point of this jib was to get a very wide range of motion from top to bottom with only a few feet of 0.75? square tube, 1? angled aluminum, 1/4? nuts and bolts, and nylon washers is all you’ll need to put the jib together. This light weight jib can be used on small portable tripods, but will require a fluid head for panning left and right. Hit up the link below for a detailed parts list and build guide. How to Make a DIY Camera Jib [via Make] How to Own Your Own Website (Even If You Can’t Build One) Pt 1 What’s the Difference Between Sleep and Hibernate in Windows? Screenshot Tour: XBMC 11 Eden Rocks Improved iOS Support, AirPlay, and Even a Custom XBMC OS

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  • Does DirectX implement Triple Buffering?

    - by Asik
    As AnandTech put it best in this 2009 article: In render ahead, frames cannot be dropped. This means that when the queue is full, what is displayed can have a lot more lag. Microsoft doesn't implement triple buffering in DirectX, they implement render ahead (from 0 to 8 frames with 3 being the default). The major difference in the technique we've described here is the ability to drop frames when they are outdated. Render ahead forces older frames to be displayed. Queues can help smoothness and stuttering as a few really quick frames followed by a slow frame end up being evened out and spread over more frames. But the price you pay is in lag (the more frames in the queue, the longer it takes to empty the queue and the older the frames are that are displayed). As I understand it, DirectX "Swap Chain" is merely a render ahead queue, i.e. buffers cannot be dropped; the longer the chain, the greater the input latency. At the same time, I find it hard to believe that the most widely used graphics API would not implement such fundamental functionality correctly. Is there a way to get proper triple buffered vertical synchronisation in DirectX?

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  • Give Us Your Thoughts About Oracle Designs

    - by Tom Caldecott-Oracle
    Participate in the Onsite Usability Lab at Oracle OpenWorld 2014 Want to impress your colleagues? Your manager? Your mom? Imagine being able to say to them, “So, did I ever tell you about the time I helped Oracle design some of their hot applications?” Yes, that opportunity is coming up—at Oracle OpenWorld.  The Oracle Applications User Experience team will host an onsite usability lab at the 2014 conference. You can participate and give us your thoughts about proposed designs for Oracle Human Capital Management Cloud and Oracle Sales Cloud, Oracle Fusion Applications for procurement and supply chain, Oracle E-Business Suite and PeopleSoft applications, social relationship management, BI applications, Oracle Fusion Middleware, and more.  Your feedback will directly affect the usability of Oracle applications to make them intuitive, easy to use. You’ll make a difference. And that should score you points with peers, friends, and family. Of course, for your mom, first you’ll probably have to explain to her again what you do for a living. If you’re interested in participating, you must sign up in advance. Space is limited. Participation requires your company or organization to have a Customer Participation Confidentiality Agreement (CPCA) on file. Don’t have one? Let us know, and we’ll start the process. Sign up now for the onsite usability lab. When?  Monday, September 29 - Wednesday, October 1, 2014  Where?  InterContinental San Francisco Want to know about other Oracle Applications User Experience activities at Oracle OpenWorld? Visit UsableApps.

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  • Why does my system use so much cache?

    - by Dave M G
    Previously, on my desktop computer running Ubuntu 14.04, I had 4GB RAM, which I thought should be plenty. However, after being on for a while, my computer would seem to get slow. I have a system resource monitor app in my Gnome panel, which I assume represents the available RAM (?). It shows a dark green area as being "Memory", and a light green area as "Cache". The "Cache" would slowly grow until it filled the whole graph, and then programs would get slow to load, or it would take a while to switch programs. I could alleviate the problem somewhat with this command, but eventually the computer cache fills up again, so it's only a bandaid: sudo sh -c "sync; echo 3 > /proc/sys/vm/drop_caches" So, I figured I'd get more RAM, so I replaced one 2GB stick with an 8GB stick, and now I have 10 GB ram. And my "cache" still slowly maxes out and my computer slows as a result. Also, sometimes the computer starts out with "cache" maxed when I first boot and log in. Not always though, I don't know if there's a pattern that determines why it happens. Why is Ubuntu using up so much cache? Is 10GB not enough for Ubuntu? Here's what my system monitor looks like in my Gnome panel. The middle square shows RAM usage. The light green area is the "cache": This is my memory and swap history, which doesn't seem to include any information about "cache". I realize at this point I'm not totally clear on the difference between "cache" and "swap":

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  • Use Network-Manager to Connect to a wifi Access Point on the command-line

    - by Stefano Palazzo
    I'd like to connect to a wireless access point from the command-line. ideally, I'd only need the name of the AP. But the hardware-address would work as well. I know I can use nmcli to connect to a managed network connection, but in my case, the access point may not be configured for Network-Manager yet (See the difference between the output of nm-tool and nmcli con). Example output of nmcli: Auto pwln 3a3d62b1-bbdf-4f76-b4d2-c211fd5cfb03 802-11-wireless [...] Wired Network aa586921-accf-4932-98c4-c873c310f08e 802-3-ethernet [...] Cisco-UDP Uni 7f94847b-04dc-40b7-9955-5246fb77cc65 vpn [...] T-mobile (D1) 867f345a-cbbf-4bd4-b883-a5e5ae0932f0 gsm [...] Example output of nm-tool: State: connected - Device: eth1 [Auto pwln] ---------------------------------------------------- [...] Wireless Access Points (* = current AP) *pwln: Infra, [...], Freq 2472 MHz, Rate 54 Mb/s, Strength 80 WPA WPA2 WLAN: Infra, [...], Freq 2422 MHz, Rate 54 Mb/s, Strength 20 WPA WPA2 [...] How do I connect to an access point that may or may not be known to NM? Extra: Finding out if the connection needs a pass-phrase, and submitting it on the command-line as well would be great too (that is to say It'd be nice if network-manager wouldn't pop open any keyring dialogues or errors on the gui)

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  • Suitable SDK to develop quick game?

    - by gRnt
    I'm currently undertaking a personal project at home that I need to turn around inside the next few months (which working full time and still learning programming makes it a tad difficult). I'm looking for suggestions on SDK's or tools (preferably free or that come with games, similar to steam tools) that I can use to develop a "game". I'm OK with coding but have no 3D development skills at all. I've very little experience with mod tools or SDK's at all but I'm hoping someone can point me in the direction of one that does the following: A decent library of prefab 3D models to build scenes. Ability to add scripting to the scene I've used Unity before and would prefer to continue to do so however I really have the worst 3D skills imaginable and can't waste time learning them. I'd be looking for pre-fab items that are both industrial and possibly more lush environments (trees etc). If it makes any difference (due to licencing and what-not) I WILL NOT be selling this game or marketing it in any way and I am a University Student if any places do educations licences. Another alternative would be to source free 3d models elsewhere but again while I'm still learning I have no idea where to look if someone could point me in the right direction I'll do the rest of the digging. Thanks

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  • Frustum culling with third person camera

    - by Christian Frantz
    I have a third person camera that contains two matrices: view and projection, and two Vector3's: camPosition and camTarget. I've read up on frustum culling and it makes it seem easy enough for a first person camera, but how would I implement this for a third person camera? I need to take into effect the objects I can see behind me too. How would I implement this into my camera class so it runs at the same time as my update method? public void CameraUpdate(Matrix objectToFollow) { camPosition = objectToFollow.Translation + (objectToFollow.Backward *backward) + (objectToFollow.Up * up); camTarget = objectToFollow.Translation; view = Matrix.CreateLookAt(camPosition, camTarget, Vector3.Up); } Can I just create another method within the class which creates a bounding sphere with a value from my camera and then uses the culling based on that? And if so, which value am I using to create the bounding sphere from? After this is implemented, I'm planning on using occlusion culling for the faces of my objects adjacent to other objects. Will using just one or the other make a difference? Or will both of them be better? I'm trying to keep my framerate as high as possible

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  • How do I stop ubuntu from detaching minimize/maximuze/close buttons?

    - by Shahbaz
    Some time ago I managed to get ubuntu to keep the window menubars in the menu rather than the bar above (I'm not sure if this part is unity or compiz, or what's the difference). That was by removing indicator-appmenu Anyway, so now everything is fine except one thing: If I have a window that is full screen, the minimize/maximize/close buttons are still grabbed by the bar on the top. Usually this doesn't cause a problem because the upper-left corner of the full screen window and the whole screen are not too far apart. However, one thing happens to me a lot, and that is I am working on something (programming), then I need to check some things from other places so I open some windows, see what I want and switch back to my work. Those windows however are temporary so at some point I want to close them. Now here's what happens: I have the focus on some window and I can't close the maximized window behind it unless I click on the window first, so that the buttons appear and then close it. I couldn't find anything on the internet about this. Is this something that's hardcoded in unity/compiz/whatever or is there actually a way to configure this?

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  • Why is testing MVC Views frowned upon?

    - by Peter Bernier
    I'm currently setting the groundwork for an ASP.Net MVC application and I'm looking into what sort of unit-tests I should be prepared to write. I've seen in multiple places people essentially saying 'don't bother testing your views, there's no logic and it's trivial and will be covered by an integration test'. I don't understand how this has become the accepted wisdom. Integration tests serve an entirely different purpose than unit tests. If I break something, I don't want to know a half-hour later when my integration tests break, I want to know immediately. Sample Scenario : Lets say we're dealing with a standard CRUD app with a Customer entity. The customer has a name and an address. At each level of testing, I want to verify that the Customer retrieval logic gets both the name and the address properly. To unit-test the repository, I write an integration test to hit the database. To unit-test the business rules, I mock out the repository, feed the business rules appropriate data, and verify my expected results are returned. What I'd like to do : To unit-test the UI, I mock out the business rules, setup my expected customer instance, render the view, and verify that the view contains the appropriate values for the instance I specified. What I'm stuck doing : To unit-test the repository, I write an integration test, setup an appropriate login, create the required data in the database, open a browser, navigate to the customer, and verify the resulting page contains the appropriate values for the instance I specified. I realize that there is overlap between the two scenarios discussed above, but the key difference it time and effort required to setup and execute the tests. If I (or another dev) removes the address field from the view, I don't want to wait for the integration test to discover this. I want is discovered and flagged in a unit-test that gets multiple times daily. I get the feeling that I'm just not grasping some key concept. Can someone explain why wanting immediate test feedback on the validity of an MVC view is a bad thing? (or if not bad, then not the expected way to get said feedback)

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  • Slow to sync music files?

    - by pst007x
    I have created a folder in the Ubuntu One sync folder and called it music. I have added various albums and the folder has started to sync. However the files were added back in October and still only the folders have synced and no music files. I tested this service before and added a single music file directly into the Ubuntu One folder (no sub folders) and within a few days it synced, however it seems anything in sub folders seem to stall or take a very long time. My ubuntu One program always says syncing and the progression bar creeps, but still no files synced. I know there are issues with speed but a month and going to sync? I recently tested the same files with Dropbox and it took 9 hours. I have port forwarded the https (443) port both in the software firewall and in my router, I tried disabling both firewalls too, either way it makes no difference. I have also tried both from home and the office on different Ubuntu systems. Is there anything anyone has done to improve this service? I am trying to integrate Ubuntu One service into the office to share project files but the syncing is taking to long. I am using the latest Ubuntu 10.10 (fully updated, fresh install), I love Ubuntu and wish to continue to support it anyway I can, so a solution would be good :-) Any help would be appreciated. Thanks Paul

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