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• Sortie de la version 1.5 de JRuby avec une amélioration du support sous Windows

  Bonjour, La semaine dernière est sortie la version 1.5 de JRuby, version à laquelle ont contribué pas moins de 30 développeurs Open Source. Parmi les 4 core developpers, 3 font partie de la société Engine Yard. Les avancées principales pour cette version sont :Meilleure intégration avec les librairies Java (gestion mémoire et CPU plus efficace) Amélioration de la compatibilité avec Ruby (Ruby 1.8.7) Amélioration du support pour Windows (les nombreux problèmes qui rendait son utilisation sous Windows compliquée ont été traités) Pour les développeurs Java, il est également à noter de meilleures intégration avec Ant et Maven. Qui utilise régulièrement JRuby, et dans quel cadre ?

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• Developing a computer system based on Nand2Tetris [on hold]

  - by Ryan

  I recently finished a book called Nand2Tetris (nand2tetris.org) where I built my own computer system from scratch with its own machine language, assembly code, and a high level language called Jack that's translated to Hack binary. However, I feel like the "computer" I built throughout the course of this book (called the Hack computer) is a bit too simple for various reasons: 1) There are only two registers (D and A), whereas most computers have much more 2) Peripheral devices like mouse and keyboard have to be directly implemented 3) Peripheral devices use a pre-planned shared memory map to communicate with the CPU instead of using interrupts (which aren't covered at all) 4) Jack (the high level language) code doesn't compile to Assembly code directly, instead it compiles to an intermediate language, which in turn gets translated to Assembly. 5) There is no ROM or permanent storage device, everything is stored in RAM 6) No support for colored monitor, networking or sound I would like to build a more complicated computer system now based on what I've learned from Nand2Tetris. Does anyone know of any good resources or books to get started on this? (BTW by computer system I mean software that can emulate the hardware of a virtual computer with its own unique instruction set)

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• Need to set up shared storage for Guest virtual machines that are running on a Xen host

  - by Sajith

  My environment: I am doing these things at home with the purpose of learning about virtualization techniques. My machine have quad core processor that supports Intel-VT and 8GB RAM. XEN is the virtualization platform. In short, all domUs are LVM based. Mainly I have two questions; I need to have shared storage for these VMs. Something like NFS / NAS / iSCSI etc. However, I don't know which one is the best solution. Therefore, can someone tell me which suits best? Please note that, this shared storage need to be accessed by the other physical machines in the network. How to implement the selected solution for question #1? Any tutorials / guidelines / ebooks will be a great help and highly appreciated. Thank you in advance :)

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• How to document and teach others "optimized beyond recognition" computationally intensive code?

  - by rwong

  Occasionally there is the 1% of code that is computationally intensive enough that needs the heaviest kind of low-level optimization. Examples are video processing, image processing, and all kinds of signal processing, in general. The goals are to document, and to teach the optimization techniques, so that the code does not become unmaintainable and prone to removal by newer developers. (*) (*) Notwithstanding the possibility that the particular optimization is completely useless in some unforeseeable future CPUs, such that the code will be deleted anyway. Considering that software offerings (commercial or open-source) retain their competitive advantage by having the fastest code and making use of the newest CPU architecture, software writers often need to tweak their code to make it run faster while getting the same output for a certain task, whlist tolerating a small amount of rounding errors. Typically, a software writer can keep many versions of a function as a documentation of each optimization / algorithm rewrite that takes place. How does one make these versions available for others to study their optimization techniques?

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• Ubuntu 12.10 live-usb won't boot

  - by user109175

  I own an Aleutia "Tango" low power PC. It uses a Intel Atom CPU N2800 @1.86GHz processor. I know there are Linux issues with the "Cedar Trail" graphics on this hardware but I can happily run Ubuntu 12.04 using the VESA graphics driver. I wanted to try out Ubuntu 12.10 so I created a live USB under 12.04 but I am unable to get this to boot. It gets as far as the Grub screen but after that the monitor shuts down. I have tried the F6 "nomodeset" option but that doesn't make any difference. Does anyone have any knowledge of this problem? Thanks in advance.

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• How do I create a 12.04 LiveUSB for a non-PAE machine?

  - by DrSkylaser

  I'm trying to create a dual-boot laptop with Ubuntu 12.04 and some flavor of Windows (TBD). To do that, I need to do some work on partitions & install 12.04. To do that, I need to create a bootable USB that will work with my non-PAE-capable CPU. Someone pointed me to a mini.iso that was allegedly non-PAE-friendly, but it gave me the same error as the straightup 12.04 desktop ISO. What version do I actually need? (This isn't going to be a virtual machine--I don't think the laptop has the RAM to handle that happily--so enabling PAE in the virtual machineware doesn't help me.)

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• How to solve dual monitor issue, which happens only during X start?

  - by tamashumi

  When is loading and two monitors are connected, instead of a login screen I see this: ...after clicking OK, selection appears: Then I'm following to console login, disconnecting by hand the secondary monitor cable, restart lightdm with a command sudo service lightdm restart ...and voila! System loads fine. If I disconnect the cable before boot X will be loaded fine too. It's not a nice 'feature' when I have to disconnect the cable each boot or X restart. I was trying to delete monitors.xml but it didn't help. The situation relates to my notebook with Intel integrated GPU. The same happens on two different pairs of monitors: at the office and at home. How can I fix this? Ubuntu 12.04 x64 Desktop with default Unity GUI.

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• Ubuntu won't boot and it is stuck on the loading screen

  - by Jordan March

  I had just installed it as dual boot 2 days ago, and everything was fine. I was installing some programs (i think it was Play On Linux) and I don't think the install was 100% done when the battery died. Since then it won't boot into Ubuntu; it just stays at the loading screen. I did make separate partitions for boot root home and swap. Can anyone help me get it back and running again? Even if I have to reinstall it. I just don't want to go back through getting all those apps. I'm running Ubuntu 12.10 64bit on a Acer Aspire 5750 core i3 cpu 4gb ram

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• What is the ideal laptop for creative coding applications?

  - by Jason

  Hi, I am a creative coder using C++(cinder and OpenFrameworks) I am looking to upgrade from my MacBook, which slowed down to about 3fps this morning. My project involves particles systems and fluids reacting to audio analysis data and computer vision data in real-time. SD or HD? no biggie. I have asked many people what computer I need. Ideally, I want a MacBook Pro. But is that enough power? I've been told that I need a desktop for what I am doing though I'd rather stay portable I've been told that I should go PC linux to get the most power but I'd rather stay mac I've been told that RAM is more of bottleneck than processor speed I've been told that the Graphics Card is more important than CPU and that code optimizations such as using trees over lists, proper threading, sending tasks to the GPU make a bigger difference than the hardware!!! what's true?! what do I need? Any suggestions are greatly appreciated

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• Graphics problem after updating to Kernel 3.11 with Ubuntu 13.04 64bit

  - by Gaurav Sharma

  I am new to ubuntu.I have a 64 bit intel processor with ATI 6570 graphics card. Now Ubuntu 13.04 is working fine with stock kernel(3.8). But as I read somewhere that kernel 3.11 do support ATI graphics card better, I tired updating them with no success. I tried 3.11.6 3.11.4 3.11.0 but with all of them I am facing the same problem ... after installing them and restart, the screen resolution get distorted and the unity becomes too slow transparency in dash and the launcher is also lost. Now whatever little I know , this may be related with graphics diver either they are not present or the graphic card is not turned on. Can some one help with this. And yeah i tried ubuntu 13.10 that worked fine but it has some bugs. and yeah please pardon me for my bad English.

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• Cant install ubuntu 12.10?

  - by harsh

  I believe i have tried every trick in the book but Ubuntu just wont install. Windows has no issue with it. I burned a DVD of Ubuntu 12.10 and it has passed all checks, but i keep getting different errors while installing. Mainly while "Creating the Partition in dev" and some times during "Copying files". The errors are: Errno 30, Errno 33, Installer crashed, failed to create partition etc... I have Intel core 2 duo 2.66Ghz, 4gb ram and ASrock motherboard. I really want to install Ubuntu 12.10 and 12.10 only! Also Should i prefer 32bit or 64bit? I have burned a 32bit version. Thank you

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• PAE on Ubuntu 12.04

  - by JamesStewy

  I am having trouble using PAE on Ubuntu 12.04 LTS 32bit. I recently upgraded from 4 to 8gb of RAM but PAE doesn't appear to have picked this up. When I run "grep --color=always -i PAE /proc/cpuinfo" I get pae in the list. When I run "dmidecode | grep Size | grep MB" Installed Size is 3825 but the Maximum Total Memory Size: 8192 MB. When I check the BIOS it says there is 8192 MB available and the computer fully supports I have followed everything I can find on the internet (including this https://help.ubuntu.com/community/EnablingPAE) and nothing is working. My Computer is a Toshiba Portege m750. It has an Intel Centrino Core 2 Duo processor. Bought in 2009 Thanks, JamesStewy

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• Grid based collision - How many cells?

  - by Fibericon

  The game I'm creating is a bullet hell game, so there can be quite a few objects on the screen at any given time. It probably maxes out at about 40 enemies and 200 or so bullets. That being said, I'm splitting up the playing field into a grid for my collision checking. Right now, it's only 8 cells. How many would be optimal? I'm worried that if I use too many, I'll be wasting CPU power. My main concern is processing power, to make the game run smoothly. RAM is not a big concern for me.

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• Partitions and cdrom are not mounted, and the bars are missing in Ubuntu 12.04

  - by nuit

  Provide my spec and sorry for my poor English first. MB: Gigabyte G31M-S2L (bios ver. F9) CPU: intel E5200 2G RAM HD1: WD 160G with 2 partitions (partition 1:60G, NTFS, win xp; partition 2:100G, NTFS) HD2: WD 320G with 2 partitions (partition 3:220G, NTFS; partition 4:100G, ext4, Ubuntu) Recently, I tried to install Ubuntu 12.04 Beta 2 on my desktop PC (on partition 4). At the beginning, everything looked great including the auto-mounting of partitions 1~3 and the unity (3D). However, after I deleted and re-allocated the partitions on HD2 and re-installed Ubuntu on partition 4, the partitions 1~3 are no longer auto-mounted when I logged in the desktop (and even the inserted cdrom would not be mounted either), and the launch bar and menu bar in unity (3D) are missing. The configurations during these two installations are all the same as default. Are there any possible reasons or solutions for this issue? Thank you in advance!

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• File system layout for multiple build targets

  - by Yttrill

  I am seeking some ideas for how to build and install software with some parameters. These including target OS, target platform CPU details, debugging variant, etc. Some parts of the install are shared, such as documentation and many platform independent files, others are not, such as 64 and 32 bit libraries when these are separated and not together in a multi-arch library. On big networked platforms one often has multiple computers sharing some large server space, so there is actually cause to have even Windows and Unix binaries on the same disk. My product has already fixed an install philosophy of $INSTALL_ROOT/genericname/version/ so that multiple versions can coexist. The question is: how to manage the layout of all the other stuff?

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• google earth 7, 32bit in 12.10 runs without error but there is no image (globe)

  - by Dennis

  Everything seemed to install fine. I can start google earth and all layers are available, I can even zoom in and look at 3-D buildings. But there is absolutely no image data displayed at all. If you look at the whole globe the outlines are there on an invisible globe. As you zoom in the base looks dark grey almost black but there is no image. I have tried. Tools Options Graphics Safe Mode Tools Options Texture colors all combinations Tools Options Cache (tried several changes to the numbers) lspci shows Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03) Running on a Dell Inspiron 6000 laptop (1.5Gb memory)

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• Can't install lib32ncurses5-dev or ia32-libs

  - by tito_drum

  I'm trying to install Android source and I keep getting this error. I kept with the installation but seems these packages are sort of required to have a complete and successful installation. this is my error Package lib32ncurses5-dev is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source Package ia32-libs is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'lib32ncurses5-dev' has no installation candidate E: Package 'ia32-libs' has no installation candidate E: Unable to locate package lib32readline5-dev E: Unable to locate package lib32z-dev I have a VM with Ubuntu on Intel® Core™ i5-2300 CPU @ 2.80GHz and 32-bit system

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• Inspiron 5720 unclaimed hardware

  - by Chelios

  I have two unclaimed devices in my Dell Inspiron 5720: *-display UNCLAIMED description: 3D controller product: NVIDIA Corporation vendor: NVIDIA Corporation physical id: 0 bus info: pci@0000:01:00.0 version: a1 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress cap_list configuration: latency=0 resources: memory:f0000000-f0ffffff memory:c0000000-cfffffff memory:d0000000-d1ffffff ioport:3000(size=128) *-serial UNCLAIMED description: SMBus product: 7 Series/C210 Series Chipset Family SMBus Controller vendor: Intel Corporation physical id: 1f.3 bus info: pci@0000:00:1f.3 version: 04 width: 64 bits clock: 33MHz configuration: latency=0 resources: memory:f1614000-f16140ff ioport:efa0(size=32) What are these devices and what drivers do I need for them? Thanks!

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• I don't have the password to update Ubuntu

  - by Steve

  I have bought a laptop with Ubuntu 12.04, which runs fine but wants to update. I don't have the password and it won't let me update anything. I have downloaded 12.04 in order to re-install it and it tells me it isn't suitable for my processor. The machine is a Dell latitude D505. I tried downloading the i386 version and on booting with the disc, I get: This kernel requires features not present on CPU. pae. Unable to boot. All I'm trying to do is to let software updater do it's stuff but as it asks for a password, I can't proceed. I've tried changing password in root shell but that doesn't work. Any ideas? Nothing seems to be working with this problem, so maybe I'll just wait for the next official release and try again.

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• problems with graphic performance in Ubuntu 12.04

  - by Falk

  in advance: my English is not perfect ;) processor: Intel® Core™2 Duo CPU E8500 @ 3.16GHz × 2 memory: 3,9 GiB graphics: GeForce GTX 460 Ubuntu 12.04 32-Bit fresh installed (previously 11.10 32-Bit) driver: NVIDIAs accelerated Driver (Version current-updates) probelm: In Ubuntu 12.04 I have problems with the performance of the graphics (games for example: Volley Brwawl, Neverball, Beep and Minecraft), and effects of windows (always at minimize, maximize...) There are laggs at animations, and the laggs in games are extremely annoying. Problems occur only in Ubuntu 12.04, everything was good in 11.10. No Problems with YouTube videos, HD videos. Is there a solution? BBecause I have found nothing here in the Forum and on Google. Or is an update coming soonfor driver or whatever? (This Bug is already registered in Launchpad.) Thank you!

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• Choppy window movement in Gnome 3.4 on Ubuntu 12.04

  - by mjrussell

  I have been using Gnome 3.2 since Ubuntu 11.10 was released and it has always been perfectly smooth and performed extremely well, much better than Unity. After doing a clean installation of Ubuntu 12.04, Gnome 3.4 performs less well. If just one window of a relatively simple application, such as Gnome Terminal, is opened and moved around, the movement is sometimes very choppy, but the rest of the time it's perfectly smooth. The times when it's choppy seem to be when part of the window goes off the bottom or right side of the screen. Also, if there are multiple windows open, it is almost always choppy. These facts suggest to me that it's something to do with the compositor. Unity works perfectly smoothly. Memory usage is only at about 500-600MB, out of 3GB, even with a few things open. The graphics card is the on-board Intel graphics on the Core i5 M450. Does anyone have any ideas what might be causing this problem? Thanks

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• Beginner: How to Make Explorer Always Show the Full Path in Windows 8

  - by Taylor Gibb

  In older versions of Windows the Title Bar used to display your current location in the file system. In Windows 8 this is not the default behavior, however, you can enable it if you wish to. Display the Full Path in the Windows Explorer Title Bar Press the Windows + E keyboard combination to open Windows Explorer and then switch over to the View tab. On the right-hand side click on options and then select Change folder and search options from the drop-down. When the Folder Options dialog opens, switch over to the View options. Here you will need to tick the Display the full path in the title bar check box. That’s all there is to it. How To Switch Webmail Providers Without Losing All Your Email How To Force Windows Applications to Use a Specific CPU HTG Explains: Is UPnP a Security Risk?

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• What is the best language to use for building a fulfillment engine [on hold]

  - by John Stapleton

  I asked this on stack overflow and was suggested to move it here. I do understand it is a matter of opinion which is exactly what I aim to achieve here... I wanted to know what you think is the best language to write a fulfillment engine in? I cannot provide much detail but I am trying to build a control interface for servers and i wanted to build a program daemon that would process data on the authoritative server and the slave servers( the backbone of the network) with their own daemons running would check regularly(every 5 minutes or so) with the authoritative server and process the commands(securely) I am trying to build this with a minimal footprint(cpu and ram wise for the slaves, authoritative is going to be scalable) and to make it automated so that the user does not have to configure the daemon(installation is automated by the authoritative server) I am leaning away from my usual php set up for simplicity sake. Edit: I am not an expert in any particular language but flexible enough and willing to learn another.

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• Alternative to Firefox's Tab Groups feature for Chromium/Chrome

  - by Halkinn

  Firefox keeps crashing the whole time on my Lubuntu 12.04 since version 12, I don't know why, I am running it on a Pentium IV desktop so might be CPU shortage, however I use the same set of extensions and configurations that I have on Windows' Firefox and it rarely crashes, runs smoothly and besides on Windows it can handle much more tabs opened before some freeze actually happens. Chromium is working better so far on Lubuntu, but I really do miss the Tab Groups Firefox feature, which is great to group tabs and organize them, it really is a boost on my productivity. Are you aware of any add-on which is similar for Chrome/Chromium? I've searched around on Chrome's Web Store but no luck at the moment.

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• Lenovo z470 getting hot, after 12.04 install

  - by Rodrigo

  When I was using Windows 7 my notebook temperature was very good, it stayed very cool. After I installed 12.04, my notebook base is hot all the time, I cannot even put my hands on it for a long time. My notebook has a 2nd generation Intel i5 processor. I installed Jupiter and it shows 72 Degrees Celsius constantly. Anyone got a fix for this? I don't want to go back to windows but if I do not find any solution I will have to do it. I'd be very grateful for any help.

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