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• Java - Does null variable require space in memory

  - by Yatendra Goel

  class CheckStore { private String displayText; private boolean state; private String meaningfulText; private URL url; public CheckStore(String text, boolean state) { this.displayText = text; this.state = state; } : : } As I am initializing only two variables (displayText and state) in the constructor, Will the rest two variables (meaningfulText and url which will have the value null) will require space in memory to store null value. Q1. I think they will require space. If they will, then how much memory does a null value takes in the memory (like int takes 4 bytes). Q2. How much space a string takes in memory. I guess it will depend on the length of the string. So how much space a string takes of how much length?

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• reclaim space after moving indexes to file group

  - by Titan2782

  I have an extremely large database and most of the space is the index size. I moved several indexes to a different file group (just to experiment) but no matter what I do I cannot reduce the size of the MDF. I tried shrink database, shrink files, rebuilding clustered index. What can I do to reclaim that space in the MDF? I've moved 15GB worth of indexes to a different file group. Is it even possible to reduce my mdf by that same 15gb (or close to it)? SQL Server 2008 Enterprise

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• Curiosity’s Descent to Mars in HD [Video]

  - by Jason Fitzpatrick

  Thanks to the Mars Descent Imager (MARDI) mounted on the fore-port side of Curiosity we’re treated to a high-resolution video of Curiosity’s descent to Mars. The video from MARDI, combined with the video editing of YouTube user DLFitch, yields the above video. He writes: This is a full-resolution version of the NASA Curiosity rover descent to Mars, taken by the MARDI descent imager. As of August 20, all but a dozen 1600×1200 frames have been uploaded from the rover, and those missing were interpolated using thumbnail data. The result was applied a heavy noise reduction, color balance, and sharpening for best visibility. The video plays at 15fps, or 3x realtime. The heat shield impacts in the lower left frame at 0:21, and is shown enlarged at the end of the video. Image source. Complete MSL Curiosity Descent – Full Quality Enhanced 1080p + Heat Shield impact [YouTube] HTG Explains: Is UPnP a Security Risk? How to Monitor and Control Your Children’s Computer Usage on Windows 8 What Happened to Solitaire and Minesweeper in Windows 8?

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• Curiosity’s Official Self-Portrait

  - by Jason Fitzpatrick

  NASA has released a high-resolution self portrait of Curiosity. The photo, a composite of images snapped by the rover’s agile arm and MAHLI camera, shows Curiosity in front of Mount Sharp. From the NASA release: The mosaic shows the rover at “Rocknest,” the spot in Gale Crater where the mission’s first scoop sampling took place. Four scoop scars can be seen in the regolith in front of the rover. The base of Gale Crater’s 3-mile-high (5-kilometer) sedimentary mountain, Mount Sharp, rises on the right side of the frame. Mountains in the background to the left are the northern wall of Gale Crater. The Martian landscape appears inverted within the round, reflective ChemCam instrument at the top of the rover’s mast. Self-portraits like this one document the state of the rover and allow mission engineers to track changes over time, such as dust accumulation and wheel wear. Due to its location on the end of the robotic arm, only MAHLI (among the rover’s 17 cameras) is able to image some parts of the craft, including the port-side wheels. HTG Explains: Why It’s Good That Your Computer’s RAM Is Full 10 Awesome Improvements For Desktop Users in Windows 8 How To Play DVDs on Windows 8

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• NASA Releases Highest Resolution Photo of Mars Ever Seen

  - by Jason Fitzpatrick

  Whether you’re in the mood for a high-resolution extraterrestrial wallpaper or just want to take a very close peek at the surface of Mars, this 23096 x 7681 resolution image ought to do the trick. Courtesy of NASA and Oppurtunity–the Mars Exploration Rover seen in the photo–the panoramic image was captured during the last Martian winter, between the Earth dates of December 21, 2001 and May 8, 2012. Hit up the link below to grab a full-resolution copy as well as read more about the geologic formations seen in the picture and the activities of the rover. ‘Greeley Panorama’ from Opportunity’s Fifth Martian Winter [Nasa] How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8 How to Banish Duplicate Photos with VisiPic

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• How Curiosity Took Its Self Portrait [Video]

  - by Jason Fitzpatrick

  There was enough confusion among the public as to how exactly the Curiosity Rover was able to photograph itself without the camera arm intruding into the photo that NASA released this video detailing the process. For those readers familiar with photograph blending and stitching using multiple photo sources, this should come as no surprise. For the unfamiliar, it’s an interesting look at how dozens of photos can be blended together so effectively that the arm–robotic or otherwise–of the photographer can be taken right out. Hit up the link below to read more about how NASA practiced on Earth for the shot and to see a high-res copy of the actual self portrait. Mars Rover Self-Portrait Shoot Uses Arm Choreography [NASA] Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• Easy remote communication without WCF

  - by Ralf Westphal

  If you´ve read my previous posts about why I deem WCF more of a problem than a solution and how I think we should switch to asynchronous only communication in distributed application, you might be wondering, how this could be done in an easy way. Since a truely simple example to get started with WCF still is drawing quite some traffic to this blog, let me pick up on that and show you, how to accomplish the same but much easier with an async communication API. For simplicities sake let me put all...(read more)

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• What is the kd tree intersection logic?

  - by bobobobo

  I'm trying to figure out how to implement a KD tree. On page 322 of "Real time collision detection" by Ericson The text section is included below in case Google book preview doesn't let you see it the time you click the link text section Relevant section: The basic idea behind intersecting a ray or directed line segment with a k-d tree is straightforward. The line is intersected against the node's splitting plane, and the t value of intersection is computed. If t is within the interval of the line, 0 <= t <= tmax, the line straddles the plane and both children of the tree are recursively descended. If not, only the side containing the segment origin is recursively visited. So here's what I have: (open image in new tab if you can't see the lettering) The logical tree Here the orange ray is going thru the 3d scene. The x's represent intersection with a plane. From the LEFT, the ray hits: The front face of the scene's enclosing cube, The (1) splitting plane The (2.2) splitting plane The right side of the scene's enclosing cube But here's what would happen, naively following Ericson's basic description above: Test against splitting plane (1). Ray hits splitting plane (1), so left and right children of splitting plane (1) are included in next test. Test against splitting plane (2.1). Ray actually hits that plane, (way off to the right) so both children are included in next level of tests. (This is counter-intuitive - shouldn't only the bottom node be included in subsequent tests) Can some one describe what happens when the orange ray goes through the scene correctly?

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• This Week in Geek History: HAL Goes Live, First Alien Moon Landing, First Fighter Jet Ejection Seat

  - by Jason Fitzpatrick

  Every week we bring you interesting facts from the annuals of Geekdom. This week in Geek History saw the birth of HAL, the first landing on an alien moon, and the first real-world test of a fighter jet ejection seat. Latest Features How-To Geek ETC HTG Projects: How to Create Your Own Custom Papercraft Toy How to Combine Rescue Disks to Create the Ultimate Windows Repair Disk What is Camera Raw, and Why Would a Professional Prefer it to JPG? The How-To Geek Guide to Audio Editing: The Basics How To Boot 10 Different Live CDs From 1 USB Flash Drive The 20 Best How-To Geek Linux Articles of 2010 Calvin and Hobbes Mix It Up in this Fight Club Parody [Video] Choose from 124 Awesome HTML5 Games to Play at Mozilla Labs Game On Gallery Google Translate for Android Updates to Include Conversation Mode and More Move Your Photoshop Scratch Disk for Improved Performance Winter Storm Clouds on the Horizon Wallpaper Existential Angry Birds [Video]

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• Add a Real-Time Earth Wallpaper App to Ubuntu with xplanetFX

  - by Asian Angel

  Are you tired of the same old wallpaper on your Ubuntu desktop? Now you can go from blah to literally spacious, real-time styled views of Earth with the xplanetFX Wallpaper App for Linux. You can conveniently access the “file type” downloads, screenshots, and jump-to links all on the front page. For our example we downloaded the .deb setup file on our system. The setup file will need to download three additional files to complete the setup process. After those are downloaded all dependencies will have been met and you can complete the installation process. Once that is done you can find xplanetFX by going to the Accessories Section of your Ubuntu Menu. This is what the main control window looks like when you start xplanetFX for the first time. You should take a few moments to look through the various tabs and tweak the settings for items like location, screen resolution, timing, auto-start, etc. When you are done click on Execute and within a few moments your desktop will have a fresh new look! Note: It took ~30 seconds for the display to activate on our system. Have fun with xplanetFX! xplanetFX Homepage [via OMG! Ubuntu!] Latest Features How-To Geek ETC How to Enable User-Specific Wireless Networks in Windows 7 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) How To Remove People and Objects From Photographs In Photoshop Ask How-To Geek: How Can I Monitor My Bandwidth Usage? 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 Add a Real-Time Earth Wallpaper App to Ubuntu with xplanetFX The Citroen GT – An Awesome Video Game Car Brought to Life [Video] Final Man vs. Machine Round of Jeopardy Unfolds; Watson Dominates Give Chromium-Based Browser Desktop Notifications a Native System Look in Ubuntu Chrome Time Track Is a Simple Task Time Tracker Google Sky Map Turns Your Android Phone into a Digital Telescope

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• Doing asynchronous distributed request/response service calls without WCF

  - by Ralf Westphal

  In my previous blog post I hopefully was able to demonstrate how low the entry barrier is to asynchronous remote communication. It´s as easy as hosting a service like this    10   using ( var serverSpace = new CcrSpace ().ConfigureAsHost( "wcf.port=8000" ))    11 {    12      serverSpace.HostPort(    13                     ...(read more)

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• How Mars Lost Its Atmosphere [Video]

  - by Jason Fitzpatrick

  Scientists have long theorized that Mars once had an atmosphere and surface water–but where did it go? This video showcases one of their theories about Mars’ vanished water reserves. Courtesy of NASA and the NASAexplorer channel: When you take a look at Mars, you probably wouldn’t think that it looks like a nice place to live. It’s dry, it’s dusty, and there’s practically no atmosphere. But some scientists think that Mars may have once looked like a much nicer place to live, with a thicker atmosphere, cloudy skies, and possibly even liquid water flowing over the surface. So how do you go from something like this–to something like this? NASA’s MAVEN spacecraft will give us a clearer idea of how Mars lost its atmosphere, and scientists think that several processes have had an impact. For more information about MAVEN, check out the mission page here. NASA – MAVEN: Mars Atmospheric Loss How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using? HTG Explains: What The Windows Event Viewer Is and How You Can Use It

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• Titan – The Mystery of the Missing Waves

  - by Akemi Iwaya

  The moon Titan holds a unique distinction…it is the only other known ‘object’ in our solar system with a dense atmosphere and stable bodies of surface liquid. Unlike Earth though, there are no waves on Titan. This mystery has planetary scientists baffled and on a quest to understand this incredible phenomenon. Titan: The Mystery of the Missing Waves [YouTube]     

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• Claiming the provisioned storage

  - by gita

  I created a ubuntu server vm with 64GB provisioned storage. I remember that I specified 30GB to be used for the vm. When I do df -h, I get Filesystem Size Used Avail Use% Mounted on /dev/mapper/analysis--db-root<br/> 28G 25G 904M 97% / udev 2.0G 4.0K 2.0G 1% /dev tmpfs 793M 228K 793M 1% /run none 5.0M 0 5.0M 0% /run/lock none 2.0G 0 2.0G 0% /run/shm /dev/sda1 228M 45M 171M 21% /boot The disk is almost full, how can I use my other 30GB from the provisioned storage?

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• Languages on embedded systems in aeronautic and spatial sector

  - by Niels

  I know that my question is very broad but a general answer would be nice. I would like to know which are the main languages used in aeronautic and spatial sector. I know that the OS which run on embedded systems are RTOS (Real time OS) and I think that, this languages must be checked correctly by different methods (formal methods, unit tests) and must permit a sure verification of whole process of a program.

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• What are the possible options for AI path-finding etc when the world is "partitionned"?

  - by Sebastien Diot

  If you anticipate a large persistent game world, and you don't want to end up with some game server crashing due to overload, then you have to design from the ground up a game world that is partitioned in chunks. This is in particular true if you want to run your game servers in the cloud, where each individual VM is relatively week, and memory and CPU are at a premium. I think the biggest challenge here is that the player receives all the parts around the location of the avatar, but mobs/monsters are normally located in the server itself, and can only directly access the data about the part of the world that the server own. So how can we make the AI behave realistically in that context? It can send queries to the other servers that own the neighboring parts, but that sounds rather network intensive and latency prone. It would probably be more performant for each mob AI to be spread over the neighboring parts, and proactively send the relevant info to the part that contains the actual mob atm. That would also reduce the stress in a mob crossing a border between two parts, and therefore "switching server". Have you heard of any AI design that solves those issues? Some kind of distributed AI brain? Maybe some kind of "agent" community working together through message passing?

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• 9 Gigapixel Photo Captures 84 Million Stars

  - by Jason Fitzpatrick

  The European Southern Observatory has released an absolutely enormous picture of the center of the Milky Way captured by their VISTA telescope–the image is 9 gigapixels and captures over 84 million stars. From the press release: The large mirror, wide field of view and very sensitive infrared detectors of ESO’s 4.1-metre Visible and Infrared Survey Telescope for Astronomy (VISTA) make it by far the best tool for this job. The team of astronomers is using data from the VISTA Variables in the Via Lactea programme (VVV), one of six public surveys carried out with VISTA. The data have been used to create a monumental 108 200 by 81 500 pixel colour image containing nearly nine billion pixels. This is one of the biggest astronomical images ever produced. The team has now used these data to compile the largest catalogue of the central concentration of stars in the Milky Way ever created. Want to check out all 9 billion glorious pixels in their uncompressed state? Be prepared to wait a bit, the uncompressed image is available for download but it weighs in at a massive 24.6GB. 84 Million Stars and Counting [via Wired] How Hackers Can Disguise Malicious Programs With Fake File Extensions Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer

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• How to improve Minecraft-esque voxel world performance?

  - by SomeXnaChump

  After playing Minecraft I marveled a bit at its large worlds but at the same time I found them extremely slow to navigate, even with a quad core and meaty graphics card. Now I assume Minecraft is fairly slow because: A) It's written in Java, and as most of the spatial partitioning and memory management activities happen in there, it would naturally be slower than a native C++ version. B) It doesn't partition its world very well. I could be wrong on both assumptions; however it got me thinking about the best way to manage large voxel worlds. As it is a true 3D world, where a block can exist in any part of the world, it is basically a big 3D array [x][y][z], where each block in the world has a type (i.e BlockType.Empty = 0, BlockType.Dirt = 1 etc.) Now, I am assuming to make this sort of world perform well you would need to: A) Use a tree of some variety (oct/kd/bsp) to split all the cubes out; it seems like an oct/kd would be the better option as you can just partition on a per cube level not a per triangle level. B) Use some algorithm to work out which blocks can currently be seen, as blocks closer to the user could obfuscate the blocks behind, making it pointless to render them. C) Keep the block object themselves lightweight, so it is quick to add and remove them from the trees. I guess there is no right answer to this, but I would be interested to see peoples' opinions on the subject. How would you improve performance in a large voxel-based world?

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• Ubuntu will not start any more !!!!!!!! PLEASE HELP?

  - by mike

  I really need help , I left my computer downloading all the night and i did donwload 35 go of movies ( legal ....) , I restart the computed in the morning then i booted in my encrypted windows partition for my work. Surprise in the evening when i try to boot on linux again , then it doesnt start as it's telling me low graphic mode , and doesnt boot( happen when it's really full ) . Tryed in rescue and it's telling me i have 0 mo free. Tryed in shell comand sdo root rm - Some files IMPOSSIBLE . it's telling me that my files are only in read only file systems. I mouted my other hard drive in windows as well but there is a '' Write protection '' i can only read the files. Please let me know , what solution do i have ? Should i try live usb with ubuntu ? Thanks guys

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• Installed 11.10 on shared drive, when other partition mounted, HDD shown full

  - by Thebetpet

  I just partitioned a 500GB HDD 50%-50%. I installed ubuntu 11.10 on one half and copied a load of files onto the other. When I don't mount the other partition, it shows I have used 12.1GB and have about 240GB free. The second I mount the other partition, I can't copy any files over and get a disk full message. There is about 10-20GB Free on the other partition. Am I doing something wrong or is this a bug?

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• Swap space maxing out - JVM dying

  - by travega

  I have a server running 3 WordPress instances, MySql, Apache and the play framework 2.0 on 64m initial & max heap. If I increase the max heap of the JVM that play is running in even by 16m I see the 128m of swap space steadily fill up until the the JVM dies. I notice that it is only when I am plugging away at the wordpress sites that the JVM will die. I assume this is because the JVM is not asking for memory at the time so gets collected. I notice that when I restart Apache I reclaim about half of my swap and RAM. So is there some way I can configure apache to consume less memory? Also what could be causing the swap space to get so heavily thrashed with just 16m added to the max heap size of the JVM? Server running: Ubuntu 12.04 RAM: 408m Swap: 128m Apache mods: alias.conf alias.load auth_basic.load authn_file.load authz_default.load authz_groupfile.load authz_host.load authz_user.load autoindex.conf autoindex.load cgi.load deflate.conf deflate.load dir.conf dir.load env.load mime.conf mime.load negotiation.conf negotiation.load php5.conf php5.load proxy_ajp.load proxy_balancer.conf proxy_balancer.load proxy.conf proxy_connect.load proxy_ftp.conf proxy_ftp.load proxy_http.load proxy.load reqtimeout.conf reqtimeout.load rewrite.load setenvif.conf setenvif.load status.conf status.load

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• Erase just the free space on my hard drive

  - by Patriot

  I'm about to give away an older computer with just the Windows XP operating system intact and all other programs uninstalled. However, upon peeking at the "free space" with software called "Recuva", I notice lots of deleted things that could be recoverable. Some of these include sensitive data files, pdfs, and other personal items that I would not want retrieved. I ran a program called "Eraser" to try and overwrite that data, but it failed to do an adequate job. I also tried to do the job with "Glary Utilities" but it failed too. Short of installing a new, very cheap hard drive and re-installing the bare bones operating system, I'm out of ideas. EDIT - WOW!!! I was not really expecting this many GREAT ideas. My next question is this. If I go the DBAN route and truely wipe the hard drive, then restore my disc image (I use Acronis True Image) will it also restore the free space data? Does imaging just copy readable data? I have an old image of when the OS was first installed.

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• CouchDB crashes at startup when path to config file has space(s)

  - by Barry Wark

  I'm hoping to run CouchDB as a per-user Launch Agent on OS X. I'm using the coucdbx-core folder from the CouchDB Server.app as the base of my CouchDB deployment. I'd like each user to have their own couch instance (on a different port), necessitating separate config files for each instance. The logical place to put these files is in ~/Library/Application Support/ for each user. I can put the entire distribution in ~/Library/Application Support/my-app/coucdbx, and put the .ini at ~/Library/Application Support/my-app/local.ini. Starting couchdb as bin/couchdb -a ../local.ini (from ~/Library/Application Support/my-app/coucdbx) works great. But I'd like to save every user the ~50MB couchdbx and install the couchdbx-core in a shared location (e.g. within my app's .app bundle). When I do this, the path to the per-user config file contains a space, and I get the following error when starting CouchDB: $ bin/couchdb -n -a ~/Library/Application\ Support/us.physion.ovation/default.ini {"init terminating in do_boot",{{badmatch,{error,{bad_return,{{couch_app,start,[normal,["/Users/hs/prj/build-couchdb/build/etc/couchdb/default.ini","/Users/hs/prj/build-couchdb/build/etc/couchdb/local.ini"]]},{'EXIT',{{badmatch,{error,{error,enoent}}},[{couch_server_sup,start_server,1,[{file,"/Users/hs/prj/build-couchdb/dependencies/couchdb/src/couchdb/couch_server_sup.erl"},{line,56}]},{application_master,start_it_old,4,[{file,"application_master.erl"},{line,274}]}]}}}}}},[{couch,start,0,[{file,"/Users/hs/prj/build-couchdb/dependencies/couchdb/src/couchdb/couch.erl"},{line,18}]},{init,start_it,1,[]},{init,start_em,1,[]}]}} Is there any way to provide a config file at the command line, if that config file's path includes space(s)? Despite my best efforts in the mailing list archives, wiki and google, I haven't been able to find a solution or a definitive "it can't work". Any help greatly appreciated.

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• Shrink a Volume Group in LVM / Linux in order to install Windows on the freed space

  - by Stephan Kristyn

  I have a Volume Group with Unused space. This 40Gig should become an entidy in order to install Microsoft windows 7 on it. I do not have extra space on the drive - that is why I want to shrink the VG! LVG berta resides on sda2 and consists of lv_root lv_swap unused_space I want it to become lv_root lv_swap and have a seperate entidy made out of unused_space. Microsoft Windows 7 has to get installed on this entidy. I do not understand why Linux made simple things complicated. I utterly hate LVM and think its absolute bollocks. Useful Sources: http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-system-config-lvm.html Edit: I found the answer. The necessary steps depict how complicated LVM really is. In my opinion it is best to avoiding LVM until pvresize matures as promised in its man pages. Answer: http://fedorasolved.org/Members/zcat/shrink-lvm-for-new-partition If you run into problems when you want to remove lvswap even if in resuce mode, then try swapoff /dev/vg_1/lv_swap lvchange -an /dev/vg_1/lv_swap

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• lvm mirroring space unavailable.

  - by Bryan Ward

  I am trying to migrate my data on lvm to two new disks, and setup mirroring between the two. I have successfully migrated all of the data to the first of the two disks, leaving the second one completely available as a mirror. I verified this using pvdisplay -m /dev/sd{g,h}1 --- Physical volume --- PV Name /dev/sdg1 VG Name vg PV Size 931.51 GiB / not usable 3.19 MiB Allocatable yes PE Size 4.00 MiB Total PE 238466 Free PE 82866 Allocated PE 155600 PV UUID v2nc3j-EFBR-QpuG-xgro-Rm59-fmu6-IB3QcR --- Physical Segments --- Physical extent 0 to 49999: Logical volume /dev/vg/videos Logical extents 0 to 49999 Physical extent 50000 to 99999: Logical volume /dev/vg/home Logical extents 0 to 49999 Physical extent 100000 to 129999: Logical volume /dev/vg/music Logical extents 0 to 29999 Physical extent 130000 to 155599: Logical volume /dev/vg/videos Logical extents 50000 to 75599 Physical extent 155600 to 238465: FREE --- Physical volume --- PV Name /dev/sdh1 VG Name vg PV Size 931.51 GiB / not usable 3.19 MiB Allocatable yes PE Size 4.00 MiB Total PE 238466 Free PE 238466 Allocated PE 0 PV UUID LuTrem-WcsZ-qw7l-2CDS-lLKI-wdq0-QEXhLf --- Physical Segments --- Physical extent 0 to 238465: FREE Then when I try to mirror the home logical volume for example, it says that I do not have sufficient space. I used lvconvert -m1 vg/home and the output was: Insufficient suitable allocatable extents for logical volume : 50000 more required Unable to allocate extents for mirror(s). This puzzling to me because it appears as if there is plenty of space on the second disk to mirror. Is there something I have done wrong here? Or is there a way to explicitly tell LVM where to put each leg of the mirror? I'm using lvm2.

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