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• Bug! Slow Sums and Averages

  - by Paul White

  It’s a curious thing about SQL that the SUM or AVG of no items is not zero, it’s NULL. In this post, you’ll see how this means your SUM and AVG calculations might run at half speed, or worse. As with most of my blog entries though, today’s instalment is not so much about the result, but the journey we take to get there. Before we get started on that, I just want to mention that there’s a problem with the Google Reader feed for this blog, so those of you that use that will have missed two recent entries: Seeking Without Indexes and Advanced TSQL Tuning: Why Internals Knowledge Matters. Accessing the site directly always works of course :) Ok, on to today’s story. Take a look at this query:...(read more)

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• OpenGL Performance Questions

  - by Daniel

  This subject, as with any optimisation problem, gets hit on a lot, but I just couldn't find what I (think) I want. A lot of tutorials, and even SO questions have similar tips; generally covering: Use GL face culling (the OpenGL function, not the scene logic) Only send 1 matrix to the GPU (projectionModelView combination), therefore decreasing the MVP calculations from per vertex to once per model (as it should be). Use interleaved Vertices Minimize as many GL calls as possible, batch where appropriate And possibly a few/many others. I am (for curiosity reasons) rendering 28 million triangles in my application using several vertex buffers. I have tried all the above techniques (to the best of my knowledge), and received almost no performance change. Whilst I am receiving around 40FPS in my implementation, which is by no means problematic, I am still curious as to where these optimisation 'tips' actually come into use? My CPU is idling around 20-50% during rendering, therefore I assume I am GPU bound for increasing performance. Note: I am looking into gDEBugger at the moment Cross posted at StackOverflow

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• Making profit - Adsense contains too many stopwords

  - by Jack

  I was thinking of using Adsense, but after I've read about the stopwords policy... Too many words are banned: "a**, s**t, id**t, a****le, bu****it," etc.. That generally means that I cannot use Adsense, unless I edit my posts. How else would I go about making some profit out of my site? I don't want to use things like popups, text-link ads, I can't post many shoplinks, and my site is too small to sell adspace. For specific reasons, I also don't do videos, am not planning on starting a forum or premium content, or anything very close to what's in this sentence. The reason for this post is basically the fact that I've seen sites without any ads, huge sites, and I started to wonder: how do they make money? That was Gizmodo to be precise. Some info about my site: It's a blog where I review games and post news. There is no forum, no registration.

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• Check If You Are Eligible To Try Amazon Fire TV Free for 30 days

  - by Gopinath

  Re/Code first broke the story of Amazon offering its customers to try Amazon Fire TV free for 30 days. The Amazon Fire TV costs $99 but with this offer you get a chance to try it for 30 days without paying any money. After 30 days if you are interested you can keep it with you by paying $99 otherwise you can return it to Amazon. All the costs associated with shipping to your home as well as returning back to Amazon are covered by the offer, which means it’s a real FREE offer to try! This offer is not available for everyone, but selected customers are receiving emails from Amazon. If you are interested to try free Amazon TV either you may wait to receive an offer email or click on this link to check if you are eligible. I verified it today and it says that I’m not eligible for this offer. Try your luck and all the best.

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• Ubuntu boots to totally blank after I installed some graphic card updates

  - by baboonWorksFine

  I am using Ubuntu 10.04 LTS, dual boot with win7 on ThinkPad T400, I followed Ubuntu update hints and installed some update for my ATI Radeon graphic card, but when I boot to Ubuntu(means I can still load GRUB), the tragedy happened, the screen goes to blank and no matter what key stroke, I can not get any responds, I try to go to text terminal, but impossible! However when I hit the power button, the computer would pop out the Ubuntu shutdown screen briefly and shut down. I figure out I should delete the updates package of my graphic card, but I don't even get a chance to go to text terminal, please help me!

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• How does key-based caching work?

  - by Dominic Santos

  I recently read an article on the 37Signals blog and I'm left wondering how it is that they get the cache key. It's all well and good having a cache key that includes the object's timestamp (this means that when you update the object the cache will be invalidated); but how do you then use the cache key in a template without causing a DB hit for the very object that you are trying to fetch from the cache. Specifically, how does this affect One to Many relations where you are rendering a Post's Comments for example. Example in Django: {% for comment in post.comments.all %} {% cache comment.pk comment.modified %} <p>{{ post.body }}</p> {% endcache %} {% endfor %} Is caching in Rails different to just requests to memcached for example (I know that they convert your cache key to something different). Do they also cache the cache key?

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• MVC Pattern, ViewModels, Location of conversion.

  - by Pino

  I've been working with ASP.Net MVC for around a year now and have created my applications in the following way. X.Web - MVC Application Contains Controller and Views X.Lib - Contains Data Access, Repositories and Services. This allows us to drop the .Lib into any application that requires it. At the moment we are using Entity Framework, the conversion from EntityO to a more specific model is done in the controller. This set-up means if a service method returns an EntityO and then the Controller will do a conversion before the data is passed to a view. I'm interested to know if I should move the conversion to the Service so that the app doesn't have Entity Objects being passed around.

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• Mod Puts Mac OS 7 On the Nook Touch

  - by Jason Fitzpatrick

  Thanks to a mac-hardware emulator for Android, it’s now possible to run Mac OS 7 on the Nook Touch (or other Android-based tablet). If you’ve been looking for some retro-goodness to dump on your Nook or tablet–Oregon Trail anyone?–this simple hack will certainly help. Hit up the link below for additional screenshots and more information. Mini vMac for Android Development Thread [via MikeCanex] HTG Explains: What Is Two-Factor Authentication and Should I Be Using It? HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux

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• Can't ping Ubuntu laptop from my LAN

  - by oskar

  My laptop has Ubuntu 10.10 and is connected to my router with full internet access, yet I can't ping it from other computers on my LAN. I tried the following: I can successfully ping those other computers from my Ubuntu laptop, so I didn't accidentally connect to someone else's network. I can successfully ping my Ubuntu laptop from itself, though I don't know if that means anything. I haven't messed with iptables at all, so it currently doesn't have any rules set that would cause it to reject anything. I made a DHCP reservation for my laptop's MAC address in my router to make sure I was always using the correct IP address. Please note that I am using a "command line only" install of Ubuntu, so I can't use any GUI network config tools. The reason I want to ping it is because I am trying to run an NFS server on the laptop, yet despite correctly setting it up I cannot access the NFS volume on another computer because it isn't even visible on the network right now.

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• .NET Reflector 7 Released

  - by Paulo Morgado

  This new version fixes a number of bugs and adds support for more high level C# features such as iterator blocks. A new tabbed browsing model was added and Jason Haley's PowerCommands add-in was included as an exploratory step for future versions. To find out more about version 7 just visit http://www.reflector.net/. The release of version 7 also means that the free version of .NET Reflector is no longer available for download. Maybe you can still get one of the give away licenses that Red Gate provided to communities and individuals.

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• GPL: does one line of GPLed code make program a "derived work"

  - by SigTerm

  I've recently run into some argument with a person that claims to be a lawyer (I have my suspicions about this not being completely true, though). As far as I know, copying even one line of code from GPLed program into proprietary body of code requires you to release the whole thing under GPL, if you ever decide to publish the software and make it available to the public. The person in question claims that it is "absurd" (I know it is, but AFAIK that's how GPL works), it is "redefining the copyright", "GPL has no power to do that", and claiming that "one line of GPLed code makes you release the whole thing under GPL" is absurd. That contradicts the GPL FAQ. Can somebody clarify the situation? Am I right in assumption that copying even smallest subroutine from GPL program into your code automatically makes your program a "derived work" which means you are obliged to release it under GPL license if you publish it?

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• How to Create a Separate Home Partition After Installing Ubuntu

  - by Chris Hoffman

  Ubuntu doesn’t use a separate /home partition by default, although many Linux users prefer one. Using a separate home partition allows you to reinstall Ubuntu without losing your personal files and settings. While a separate home partition is normally chosen during installation, you can also migrate to a separate home partition after installing Ubuntu – this takes a bit of work, though. HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux Hack Your Kindle for Easy Font Customization

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• 3D rotation tool. How can I add simple extrusion?

  - by Gerve

  The 3D rotation tool is excellent but it only lets you rotate 2D objects, this means my object is wafer thin. Is there any way to add simple extrusion or depth to a symbol? I don't really want to use any 3rd party libraries like Away3D or Papervision, this is overkill for my simple 2D game. I only want to do this creating a couple motion tweens if possible. More Details: Below is what my symbol looks like (just with a bit more color). The symbol does a little 3D rotation and then flies away, it's just for something like a scoreboard within the app.

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• Service and/or tool to monitor performance?

  - by chris

  I am seeing wildly different performance from a clients web site, and would like to set up some sort of monitoring. What I'm looking for is a service that will issue requests to a couple of URLs, and report on the time it took to process the page - TTFB and time to download the entire page - that means I need something that will process javascript & css. Are there services like this? I've seen a few that monitor uptime, but they don't seem to report on the overall page performance.

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• In retrospect, has it been a good idea to use three-valued logic for SQL NULL comparisons?

  - by Heinzi

  In SQL, NULL means "unknown value". Thus, every comparison with NULL yields NULL (unknown) rather than TRUE or FALSE. From a conceptional point of view, this three-valued logic makes sense. From a practical point of view, every learner of SQL has, one time or another, made the classic WHERE myField = NULL mistake or learned the hard way that NOT IN does not do what one would expect when NULL values are present. It is my impression (please correct me if I am wrong) that the cases where this three-valued logic helps (e.g. WHERE myField IS NOT NULL AND myField <> 2 can be shortened to WHERE myField <> 2) are rare and, in those cases, people tend to use the longer version anyway for clarity, just like you would add a comment when using a clever, non-obvious hack. Is there some obvious advantage that I am missing? Or is there a general consensus among the development community that this has been a mistake?

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• Studies of Pair Programming on Translation Projects

  - by gmletzkojr

  I am looking for information (ie, studies, metrics, etc) for pair programming when translating a project from an "older" language to a "newer" language. In this particular case, translating means line for line translation where ever possible, and only modifying the design when absolutely necessary, not when the modification would provide improved performance. I have performed pair programming in new development, and I am well aware of the pros and cons of pairing in that environment. However, I haven't been able to find any information in this particular case. Any help is appreciated.

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• Oracle Solaris 11.1 Security Lab

  - by user12608073

  Recently I developed a set of lab exercises for an Oracle OpenWorld Hands On Lab, entitled HOL10201, Reduce Risk with Oracle Solaris Access Control to Restrain Users and Isolate Applications. This explored the new Extended Policy for privilege assignments in Oracle Solaris 11.1.  Today, Oracle Solaris 11.1 has been officially released via the Package Repository. Today's release and branch are numbered 0.5.11-0.175.1.0.0.24.2, which means it is based on build 24b of 11.1 which is, in turn, based on build 175a of 11.0.  There is a good summary of new features available here: Oracle Solaris 11.1 - What's New . Pages 5 thru 7 give an overview of some of the new security enhancements. There is much more information available in the newly published documentation for Oracle Solaris 11.1. I plan to explore some of these enhancements in a series of blog entries. Meanwhile, I've published a copy of the lab materials, which you can try out with this new release.

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• 8 Ways to Tweak and Configure Sudo on Ubuntu

  - by Chris Hoffman

  Like most things on Linux, the sudo command is very configurable. You can have sudo run specific commands without asking for a password, restrict specific users to only approved commands, log commands run with sudo, and more. The sudo command’s behavior is controlled by the /etc/sudoers file on your system. This command must be edited with the visudo command, which performs syntax-checking to ensure you don’t accidentally break the file. HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux Hack Your Kindle for Easy Font Customization

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• are keywords in URLs good SEO or needlessly redundant?

  - by Blazemonger

  A coworker and I are locked in a debate over the value of SEO keywords in the URL of a page. She wants to change all the filenames of the HTML pages of a fencing company so they look like residential-home-chicago.html, contact-chicago-contractor.html, and so on. She is convinced that because Google highlights keywords in URLS in search results, that means that putting keywords here is more valuable. My position is that these do not improve SEO, since Google doesn't seem to give keywords in the URL any more weight than keywords in the body of the page, and might even give them less weight. In the meantime, they make it harder for me to find the pages I want when its time to edit them, and the site as a whole looks cheap and spammy. Google's own SEO guide suggests to me that yes, keywords in URLs are useful, but not superior, and that they are more useful for human readability than search engine rankings. I'm looking for authoritative sources that support either position, not blog articles from SEO optimization companies trying to promote themselves.

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• iPad Jailbreak &ndash; On The Lam In A Single Day

  - by David Totzke

  Exploits to jailbreak the iPhone are well known.  The iPad runs on the iPhone 3.2 firmware.  What this means is that the iPad was shipped with known security vulnerabilities that would allow someone to gain root access to the device. Nice. It’s not like these are security vulnerabilities that are known but have no exploits.  The exploits are numerous and freely available. Of course, if you fit the demographic, you probably have nothing to worry about. Magical and Revolutionary?  Hardly. Dave Just because I can…

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• Not Working Nvidia GT 635M drivers

  - by Andres

  I'm having problems trying to use my Nvidia 635M in my asus N46VJ laptop. I open the "Nvidia X server settings" I get this message : "You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run nvidia-xconfig as root), and restart the X server." I open the terminal typi "sudo nvidia-xconf" and this creates a file, /etc/X11/xorg.conf After reboot I'm in a lower resolution of 640x480, without other options to change it, then open the Details system and it shows me this in the Graphic item: Intel® Ivybridge Mobile I type this in the terminal (no idea what that means, I just saw it in a forum!!!) lspci -vnn | grep '\''[030[02]]' and get this: 00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller]) 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF108M [GeForce GT 635M] [10de:0de3] (rev a1) (prog-if 00 [VGA controller]) I installed bumblebee but nothings happens additionally the additional drivers shows me "no propietary Drivers are in use on this system"

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• I can't open Ubuntu Software Center

  - by user165700

  I downloaded google chrome that was made for my computer from https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb. For some reason after I installed I can't open. Also in the corner where the time and other things are there's this red circle with a white dash in the middle of it. It says "An error occured, please run package manager from the right click menu or apt-get in a terminal to see what is wrong. The error message was: 'Unknown Error:''(E:The package google-chrome-stable needs to be reinstalled,but I can't find an archive for it.)' This usually means that your installed packages have unmet dependencies.

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• Why and when should I make a class 'static'? What is the purpose of 'static' keyword on classes?

  - by Saeed Neamati

  The static keyword on a member in many languages mean that you shouldn't create an instance of that class to be able to have access to that member. However, I don't see any justification to make an entire class static. Why and when should I make a class static? What benefits do I get from making a class static? I mean, after declaring a static class, one should still declare all members which he/she wants to have access to without instantiation, as static too. This means that for example, Math class could be declared normal (not static), without affecting how developers code. In other words, making a class static or normal is kind of transparent to developers.

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• SSIS - The expression cannot be parsed because it contains invalid elements at the location specifie

  - by simonsabin

  If you get the following error when trying to write an expression there is an easy solution Attempt to parse the expression "@[User::FilePath] + "\" + @[User::FileName] + ".raw"" failed.  The token "." at line number "1", character number "<some position>" was not recognized. The expression cannot be parsed because it contains invalid elements at the location specified. The SSIS expression language is a C based language and the \ is a token, this means you have to escape it with another one. i.e "\" becomes "\\", unlike C# you can't prefix the string with a @, you have to use the escaping route. In summary when ever you want to use \ you need to use two \\

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• Vim key mappings / plugin XCode?

  - by Daniel Upton

  I'm a developer who mostly does web stuff in ruby and C#.. I'd like to start tinkering with iOS and Mac development, Over the last few month i've been trying to get fluent in one set of key bindings (vi / vim because it just feels right).. I have the awesome ViEmu installed for visual studio on windows which gives me a ton of the vim awesomeness side by side with visual studio power toys.. Is there anything like this for xcode? I know i could set up MacVim as the default editor but i'm not too interested in this as it means losing all of xcode's cocoa awareness.. The other option of course would be to go for the lowest common denominator and switch to emacs (as the mac keybindings are based massively on emacs) but lets not think about that for too long. :P

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