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• Oracle NoSQL Database Using FusionIO ioDrive2

  - by Charles Lamb

  We ran some benchmarks using FusionIO ioDrive2 SSD drives and Oracle NoSQL Database. FusionIO has published a whitepaper with the results of the benchmarks. "Results of testing showed that using an ioDrive2 for data delivered nearly 30 times more operations per second than a 300GB 10k SAS disk on a 90 percent read and 10 percent write workload and nearly eight times more operations per second on a 50 percent read and 50 percent write workload. Equally impressive, an ioDrive2 reduced latency over 700 percent (seven times) on inserts in a 90 percent read and 10 percent write workload and over 5800 percent (58 times) on reads in a 50 percent read and 50 percent write workload."

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• Periodic updates of an object in Unity

  - by Blue

  I'm trying to make a collider appear every 1 second. But I can't get the code right. I tried enabling the collider in the Update function and putting a yield to make it update every second or so. But it's not working (it gives me an error: Update() cannot be a coroutine.) How would I fix this? Would I need a timer system to toggle the collider? var waitTime : float = 1; var trigger : boolean = false; function Update () { if(!trigger){ collider.enabled = false; yield WaitForSeconds(waitTime); } if(trigger){ collider.enabled = true; yield WaitForSeconds(waitTime); } } }

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• When to use typedef?

  - by futlib

  I'm a bit confused about if and when I should use typedef in C++. I feel it's a balancing act between readability and clarity. Here's a code sample without any typedefs: int sum(std::vector<int>::const_iterator first, std::vector<int>::const_iterator last) { static std::map<std::tuple<std::vector<int>::const_iterator, std::vector<int>::const_iterator>, int> lookup_table; std::map<std::tuple<std::vector<int>::const_iterator, std::vector<int>::const_iterator>, int>::iterator lookup_it = lookup_table.find(lookup_key); if (lookup_it != lookup_table.end()) return lookup_it->second; ... } Pretty ugly IMO. So I'll add some typedefs within the function to make it look nicer: int sum(std::vector<int>::const_iterator first, std::vector<int>::const_iterator last) { typedef std::tuple<std::vector<int>::const_iterator, std::vector<int>::const_iterator> Lookup_key; typedef std::map<Lookup_key, int> Lookup_table; static Lookup_table lookup_table; Lookup_table::iterator lookup_it = lookup_table.find(lookup_key); if (lookup_it != lookup_table.end()) return lookup_it->second; ... } The code is still a bit clumsy, but I get rid of most nightmare material. But there's still the int vector iterators, this variant gets rid of those: typedef std::vector<int>::const_iterator Input_iterator; int sum(Input_iterator first, Input_iterator last) { typedef std::tuple<Input_iterator, Input_iterator> Lookup_key; typedef std::map<Lookup_key, int> Lookup_table; static Lookup_table lookup_table; Lookup_table::iterator lookup_it = lookup_table.find(lookup_key); if (lookup_it != lookup_table.end()) return lookup_it->second; ... } This looks clean, but is it still readable? When should I use a typedef? As soon as I have a nightmare type? As soon as it occurs more than once? Where should I put them? Should I use them in function signatures or keep them to the implementation?

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• What utility is like Ten Clips, providing an enumerated clipboard?

  - by Aaron Newton

  A very useful (Windows) utility I use is TenClips - http://www.paludour.net/TenClips.html It allows you to create enumerated clipboards/emacs-like buffers easily using ctrl + f1, ctrl + f2, ctrl + f3, etc., copy to the clipboard in the first buffer, switch to the second buffer, copy without loosing our first buffer, switch back to the first buffer and paste, switch to the second buffer and paste and so forth. Does something like this exist for Ubuntu? The closest post I could find was Looking for an application that saves clipboard history which recommended Parcellite (http://parcellite.sourceforge.net/?page_id=2) - which keeps the history - but this is not quite what I'm after. If not I might make this a pet project :D

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• Unrecognized Display

  - by Kevin

  I just installed a fresh copy of Ubuntu 12.04, and before I installed drivers, I was able to get my two monitor setup working just fine. However, after updating all my drivers and installing all the recommended software, my second display is no longer detected. My main display is called "Laptop" (which it was detected as the monitor name previously), but it is the only display listed. I tried to detect displays, nothing happened. The monitor is plugged in, and should be working fine - after all, it just was. How can I fix the problem of Ubuntu not listing my second monitor in the display settings?

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• Getting the masked URL values in Mediawiki

  - by Kalai

  I have successfully masked the URL in Mediawiki. By using the following scripts in .htaccess and localsettings.php files in Mediawiki, i.e.: .htaccess: Options +FollowSymLinks RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)/(.*)$ /mediawiki/index.php?title=$1&actions=$2 [L] Localsettings.php: $wgScriptPath = "/lib/mediawiki"; $wgArticlePath = "/lib/mediawiki/$1/$2"; It is working fine with required URL. But my problem is I want to consider the second parameter as a querystring for my pages. But I could not get the second parameter in my file. I tried with $wgrequest function but it is only giving the first parameter as title. I tried with $_REQUEST also, it is sometimes give the value of $_REQUEST['actions']. But many times not. I cant understand what is the problem.

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• Ubuntu 12.04 nVidia TwinView tearing

  - by Andy Turfer

  I'm running Ubuntu 12.04. Today I just purchased a second monitor (I have a Dell U2711 and a 42-inch Sony TV). I'm running the 295.49 proprietary nVidia graphics driver, my graphics card is a GeForce GTX 460. I am not able to activate "xinerama" with "separate X screens", not sure why. I am able to use TwinView. This works, although it results in severe tearing on the Sony TV. It's as though "sync to vblank" isn't working (I have this set in Compiz and in the nVidia settings). If I disable the Dell U2711 and only use the Sony, everything works fine, zero tearing. Is it the case that "sync to vblank" can only work on a single monitor in Ubuntu 12.04? Is there any way to get rid of the tearing on the second monitor in TwinView mode?

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• Unable to retrive open-id password wheras able to login via gmail only???

  - by diEcho

  Hello All, I have two OPEN-ID accounts referenced with same gmail address, now i forget one of my Open ID account's password and when i tried to recover my password then the mail sent by The MyOpen ID Team having second one open-id account's password change link whereas i need first one open-id password. i tries a lot of times to recover but each time mail having second open-id passord change link so what do i do to recover my first open-id password whereas i m able to login from that open-id via gmail account. i have mailed to open id teams many times already? but no answer?? how do i collect all open ID password reset link referencing same email address??

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• Ubuntu 11.10 momentarily freezes every couple minutes

  - by Jeff Welling

  I'm working on an Acer Aspire One D257 running Ubuntu 11.10, and every few minutes the laptop freezes up for a second or two, before becoming responsive again. This doesn't really present a huge problem, but when I'm trying to code all of a sudden vim stops responding for a couple seconds while I'm trying to modify my code, it's increasingly frustrating. The odd part is, if I play a movie in VLC at the same time, when vim pauses the video keeps playing just fine (VLC's priority is not modified). I'm wondering if anyone knows why this may be happening, or in lieu of that, how I might be able to track down the source of my frustrating pauses. Normally I would try using top, but the pauses are shorter than 2 seconds so nothing unusual shows up in top as consuming the CPU. Does anyone know how to troubleshoot intermittent repeating 1 second long pauses in vim?

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• Mouse cursor lag after lock screen, 64 bit 12.04

  - by Bill Jones

  Recently I have noticed that when I return to my computer after it has been "locked" for a while, the mouse pointer has significant lag. The cursor position appears to only update a few times a second. Moving the mouse results in the pointer "following" the movement in a jerky kind of way, and then continuing for some fraction of a second after I have stopped using the mouse. Replacing the mouse has no effect. (I have two differently branded and constructed usb optical mice). Plugging either mouse into a different usb port has no effect. Once the problem was resolved by "suspending" the system, and then re-starting it with the power switch, but this does not work every time. So far, the only fool-proof fix is to shut the system down and re-start it (re-boot). I have tried this suggested fix. It had no effect.

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• Find directories that DON'T contain a file

  - by Oli

  Yes, I'm sorting out my music. I've got everything arranged beautifully in the following mantra: /Artist/Album/Track - Artist - Title.ext and if one exists, the cover sits in /Artist/Album/cover.(jpg|png). I want to scan through all the second-level directories and find the ones that don't have a cover. By second level, I mean I don't care if /Britney Spears/ doesn't have a cover.jpg, but I would care if /Britney Spears/In The Zone/ didn't have one. Don't worry about the cover-downloading (that's a fun project for me tomorrow) I only care about the glorious bash-fuiness about an inverse-ish find example.

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• I installed Ubuntu alongside Windows but I can't see it in Windows' boot menu

  - by André Hallé

  I have a second machine where Ubuntu 12.04 LTS and Debian Squeeze are installed on the same HD and when I boot, I have this grub menu where I can choose which partition I will used. It works perfectly! But in my Windows environment that's another story. Now after making almost everything that I know, to make it work along Windows 7, there is no entry in the boot menu of Windows (I know, Ubuntu use grub but anyway there is surely a way to fix it, access it?). Why there is no Ubuntu entry? Why the installation gave me no error while I have this strange situation of having a "ghost OS" called Ubuntu installed somewhere in my second HD in a partition made especially for it and not being able to access it, starting it, having it working? Am I wrong? If I am, what's the problem? If I'm not, what's the need of Wubi?

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• X crash at login for 1 user

  - by marxjohnson

  User switching wasn't working on my 12.04 LTS desktop (just dropped me to TTY8 with a blinking cursor) so I tried to manually start a second X session by logging in to TTY6 and running startx -- :1. This didn't work either, and my machine locked up. Now when I try to log in as the second user from LightDM, X instantly crashes and I'm thrown back to the login screen. Other accounts on the machine work fine, and it happens for every desktop environment. I've had a poke around in my home directory, but I can't see anything obvious to change/delete to get it working again. Can anyone advise please?

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• What is the name of this array transformation?

  - by Brandon Tilley

  Start with an array of arrays; in this case, they are different lengths in order to demonstrate the technique, but they do not have to be. [[1,2,3,4], [5,6,7], [8,9,10], [11,12,13,14,15]] At the other end of the transformation, you have an array of arrays where the first array contains the first element from each of the original arrays, the second array contains the second element from each of the original arrays, and so on. [[1,5,8,11], [2,6,9,12], [3,7,10,13], [4,14], [15]] Is there a mathematical or CS term for this operation?

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• Python Language Upgrade Slithers Toward Final Release

  A second release candidate for Python 2.7 will become available June 19, with the final code release on July 3.

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• Python Language Upgrade Slithers Toward Final Release

  A second release candidate for Python 2.7 will become available June 19, with the final code release on July 3.

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• Question about mod_rewrite rule for redirecting failing pages

  - by SimpleCoder

  I'm setting up a mod_rewrite rule that redirects failing pages to a custom Page Not Found page. This is with Wordpress. I'm using the guide here: http://httpd.apache.org/docs/2.2/rewrite/rewrite_guide_advanced.html#redirect404. My rule so far looks like this: RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.+) http://example.com/?page_id=254 [R] This works. It seems to be a combination of the first and second suggestion that worked, since the -U flag did nothing. My question is, out of curiosity why the following happens: When I change REQUEST_FILENAME to REQUEST_URI (as the second example suggests), the page loads, but none of the style sheets load. All of my formatting is gone, and this happens on every page. Can anyone think of why this might happen?

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• G5 quad core will not boot from Ubuntu CD

  - by Steve Howard

  I have a PPC G5 Quad Core with Leopard on one hard drive and I want to install Ubuntu on a second hard drive. The second drive is installed and formatted as a Mac OS Extended (Journaled) drive. I have had no success booting from a CD or DVD with various PPC versions of Ubuntu using any of the suggested keys such as "C, Option, or anything else. Booting into open firmware doesn't work as the system can't find the \install\yaboot file. I am using various CD's burned as iso disk images, but none will boot. I have reset the PRAM, etc, to no avail. Beginning to get very frustrated. Can someone shed some light and provide me with a command line in open firmware that will work, or else direct me to a confirmed PPC bootable version of Ubuntu please? I'd appreciate any help you can provide....

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• Coding an IQ Test with Conditionally Driven Event Handlers in ASP.NET 3.5

  This is the second part of a tutorial series on developing conditionally-driven event handlers in ASP.NET 3.5. In part one you started learning how to build an online IQ test with ASP.NET 3.5 the creation of web forms and setting of objectives were discussed. In this second part we ll really sink our teeth into using conditionally-driven event handlers to make the test work.... Business Productivity Online Suite From $10 per user per month. Includes a 12-month subscription. Min 5 seats.

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• How to use a mask texture with Kobold2D

  - by alex

  I am an iOS developer but I'm new to cocos2d. I'm working on new game, I use Kobold2D, have cocos2d installed too, and I want to make this effect: I know how is done with Flash, but can't make it with Kobold2D. There's 2 images with the same size: one is a low-res image for the background and the second is a hi-res over the first one. When the "reticle" mask moves, it reveals the second image inside the circle and the background is visible outside only. I googled with no success, saw some Ray Wenderlich projects they weren't helpful.

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• Enabling and Disabling Colliders Unity

  - by Blue

  I'm trying to make the collider appear every 1 second. But I can't get the code write. I tried enabling the collider under a boolean and putting a yield to make it every second or so. But it's not working(gives me an error: Update() can not be a coroutine.). How would I fix this? Would I need a timer system and set the collider to be enabled every 'x' seconds and disabled every 'y' seconds? var waitTime : float = 1; var trigger : boolean = false; function Update () { if(!trigger){ collider.enabled = false; yield WaitForSeconds(waitTime); } if(trigger){ collider.enabled = true; yield WaitForSeconds(waitTime); } } }

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• screen flickering

  - by lilicus

  When using some applications (LibreOffice, Chrome) it happens that screen flicker (just for a second, or even less than a second) or screen turns into black and then back to normal again... it all happens very fast (usually when clicking with the mouse)... for example, I was searching something in google chrome and list of possible results appeared - when I double click on the search text area (not list of possible results) screen flicker... or when changing border lines in LibreOffice Calc... I managed to create screen shot while using LibreOffice Calc. I am using Nvidia 313 drivers-updates on Ubuntu 13.04. What could be the problem?

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• Mobile Application Sales to Reach '$17.5bn by 2012'

  The second largest app store believes it can challenge iPhone's dominance.

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• Mobile Application Sales to Reach '$17.5bn by 2012'

  The second largest app store believes it can challenge iPhone's dominance.

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• 2-components color model

  - by Cyan

  RGB is the natural color model for OpenGL. But a lot of other color models exist. For example, CMY(K) for printers, YUV for JPEG, the little cousins YCbCr and YCoCg, HSL & HSV from the 70's, and so on. All these models tend to share a common property : they are based on 3 components. Therefore my question is : Does it exist a 2-components color model ? I'm surprised to not find any. I was expecting something along the line of Hue+light could exist. I guess it cannot be as "complete" as a true 3-components color model, but a fine-enough approximation will be good for my usecase. The end objective is to store the 2 components into a single BC5 texture (GL_COMPRESSED_RED_GREEN_RGTC2 in OpenGL). The 3rd component requires a second fetch into a second texture, which hurts performance.

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