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• Microsoft Silverlight 4 Data and Services Cookbook &ndash; Book Review (sort of)

  - by Jim Duffy

  I just received my copy of the Microsoft Silverlight 4 Data and Services Cookbook, co-authored by fellow Microsoft Regional Director, Gill Cleeren, and at first glance I like what I see. I’ve always been a fan of the “cookbook” approach to technical books because they are problem/solution oriented. Often developers need solutions to solve specific questions like “how do I send email from within my .NET application” and so on, and yes, that was a blatant plug to my article explaining how to accomplish just that, but I digress. :-) I also enjoy the cookbook approach because you can just start flipping pages and randomly stop somewhere and see what nugget of information is staring up at you from the page. Anyway, what I like about this book is that it focuses on a specific area of Silverlight development, accessing data and services.  The book is broken down into the following chapters: Chapter 1: Learning the Nuts and Bolts of Silverlight 4 Chapter 2: An Introduction to Data Binding Chapter 3: Advanced Data Binding Chapter 4: The Data Grid Chapter 5: The DataForm Chapter 6: Talking to Services Chapter 7: Talking to WCF and ASMX Services Chapter 8: Talking to REST and WCF Data Services Chapter 9: Talking to WCF RIA Services Chapter 10: Converting Your Existing Applications to Use Silverlight As you can see this book is all about working with Silverlight 4 and data. I’m looking forward to taking a closer look at it. Have a day. :-|

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• can canonical links be used to make 'duplicate' pages unique?

  - by merk

  We have a website that allows users to list items for sale. Think ebay - except we don't actually deal with selling the item, we just list it for sale and provide a way to contact the seller. Anyhow, in several cases sellers maybe have multiple units of an item for sale. We don't have a quantity field, so they upload each item as a separate listing (and using a quantity field is not an option). So we have a lot of pages which basically have the exact same info and only the item # might be different. The SEO guy we've started using has said we should put a canonical link on each page, and have the canonical link point to itself. So for example, www.mysite.com/something/ would have a canonical link of href="www.mysite.com/something/" This doesn't really seem kosher to me. I thought canonical links we're suppose to point to other pages. The SEO guy claims doing it this way will tell google all these pages are indeed unique, even if they do basically have the same content. This seems a little off to me since what's to stop a spammer from putting up a million pages and doing this as well? Can anyone tell me if the SEO guy's suggestion is valid or not? If it's not valid, then do i need to figure out some way to check for duplicated items and automatically pick one of the duplicates to serve as an original and generate canonical links based off that? Thanks in advance for any help

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• how to make a continuous machine gun sound-effect

  - by Jan

  I am trying to make an entity fire one or more machine-guns. For each gun I store the time between shots (1.0 / firing rate) and the time since the last shot. Also I've loaded ~10 different gun-shot sound-effects. Now, for each gun I do the following: function update(deltatime): timeSinceLastShot += deltatime if timeSinceLastShot >= timeBetweenShots + verySmallRandomValue(): timeSinceLastShot -= timeBetweenShots if gunIsFiring: displayMuzzleFlash() spawnBullet() selectRandomSound().play() But now I often get a crackling noise (which I assume is when two or more guns are firing at the same time and confuse the sound-device). My question is whether A) This a common problem and there is a well-known solution, maybe to do with the channels or something, or B) I am using a completely wrong approach to the task. I had a look at some sound-assets for other games and they used complete burst with multiple shots. I suppose I could try that, but I would like to have organic little hickups in the gun-fire (that's what the random value is for) to make the game more gritty and dirty. I am using Panda3D, but I had the exact same problem in PyGame and SDL. [edit] Thanks a lot for the answers so far! One more problem with faking it though: Now how do I stop the sound? Let's say I have an effect with 5 bangs... *bang* *bang* *bang* *bang* *bang* And I magically manage to loop it so that there's no gap or overlap if the player fires more than 5 shots. Now, what do I do if the player stops firing halfway through the third bang? How do I know how long to keep playing the sample so that the third bang is completed and I can start playing the rumbling echo of the last shot? Of course I can look up the shot/pause timing of that sound-sample and code accordingly, but it feels extremely hacky.

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• What to do when TDD tests reveal new functionality that is needed that also needs tests?

  - by Joshua Harris

  What do you do when you are writing a test and you get to the point where you need to make the test pass and you realize that you need an additional piece of functionality that should be separated into its own function? That new function needs to be tested as well, but the TDD cycle says to Make a test fail, make it pass then refactor. If I am on the step where I am trying to make my test pass I'm not supposed to go off and start another failing test to test the new functionality that I need to implement. For example, I am writing a point class that has a function WillCollideWith(LineSegment): public class Point { // Point data and constructor ... public bool CollidesWithLine(LineSegment lineSegment) { Vector PointEndOfMovement = new Vector(Position.X + Velocity.X, Position.Y + Velocity.Y); LineSegment pointPath = new LineSegment(Position, PointEndOfMovement); if (lineSegment.Intersects(pointPath)) return true; return false; } } I was writing a test for CollidesWithLine when I realized that I would need a LineSegment.Intersects(LineSegment) function. But, should I just stop what I am doing on my test cycle to go create this new functionality? That seems to break the "Red, Green, Refactor" principle. Should I just write the code that detects that lineSegments Intersect inside of the CollidesWithLine function and refactor it after it is working? That would work in this case since I can access the data from LineSegment, but what about in cases where that kind of data is private?

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• thick client migration to web based application

  - by user1151597

  This query is related to application design the technology that I should consider during migration. The Scenario: I have a C#.net Winform application which communicates with a device. One of the main feature of this application is monitoring cyclic data(rate 200ms) sent from the device to the application. The request to start the cyclic data is sent only once in the beginning and then the application starts receiving data from the device until it sends a stop request. Now this same application needs to be deployed over the web in a intranet. The application is composed of a business logic layer and a communication layer which communicates with the device through UDP ports. I am trying to look at a solution which will allow me to have a single instance of the application on the server so that the device thinks that it is connected as usual and then from the business logic layer I can manage the clients. I want to reuse the code of the business layer and the communication layer as much as possible. Please let me know if webserives/WCF/ etc what i should consider to design the migration. Thanks in advance.

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• Html 5 clock, part ii - CSS marker classes and getElementsByClassName

  - by Norgean

  The clock I made in part i displays the time in "long" - "It's a quarter to ten" (but in Norwegian). To save space, some letters are shared, "sevenineight" is four letters shorter than "seven nine eight". We only want to highlight the "correct" parts of this, for example "sevenineight". When I started programming the clock, each letter had its own unique ID, and my script would "get" each element individually, and highlight / hide each element according to some obscure logic. I quickly realized, despite being in a post surgery haze, …this is a stupid way to do it. And, to paraphrase NPH, if you find yourself doing something stupid, stop, and be awesome instead. We want an easy way to get all the items we want to highlight. Perhaps we can use the new getElementsByClassName function? Try to mark each element with a classname or two. So in "sevenineight": 's' is marked as 'h7', and the first 'n' is marked with both 'h7' and 'h9' (h for hour). <div class='h7 h9'>N</div><div class='h9'>I</div> getElementsByClassName('h9') will return the four letters of "nine". Notice that these classes are not backed by any CSS, they only appear directly in html (and are used in javascript). I have not seen classes used this way elsewhere, and have chosen to call them "marker classes" - similar to marker interfaces - until somebody comes up with a better name.

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• Xorg becomes unkillable at 3AM

  - by chew socks

  Most nights, some time in the hour of 3AM my xorg process will increase to 100% cpu and gpu load will also increase to 100%. The process also becomes unkillable. I cannot sudo kill -9 it or get back control with sudo service lightdm restart. I also cannot switch to to a tty screen with ctrl + alt + f1. To reboot I have to log in with ssh, but this is not perfect because if I reboot while it is doing this my ZFS pool will fail to mount when it comes back up ( that is where my /home is ). Does anyone have any ideas as to why I can't stop and restart xorg, or even better, know why this is happening? Thanks NOTE: For anyone who comes looking for the same problem. I disabled catalyst AI and made it through the night. I've been up for 1 day 3 hours now. My record for this month is 2 days and 19 hours without a problem. My all time record is 6 days without a crash. I'll post here if it crashes again or I'm able to set a new record.

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• Music player with a few specific requirements

  - by Jordan Uggla

  I am looking for a music player with a few specific requirements: Must have a search function that whittles down results as you type, searching the entire library. Must start playing a song when double clicked, and not continue to another song when that song finishes. Must be approachable and immediately usable by people completely unfamiliar with the program. I think this is mostly covered by the first two requirements being met. I've tried many players but unfortunately every one has failed to meet at least one of the requirements. Rhythmbox meets 1 and 3, but continues to the next search result after the song which was double clicked ends. Banshee is basically the same as Rhythmbox. While it has an option to "Stop when finished" this cannot (as far as I can tell) be made the default when double clicking a song. Audacious (as far as I can tell) fails at 1. Muine meets requirements 1 and 2, but unfortunately I couldn't make the search dialog always shown like it is with Rhythmbox / Banshee which, despite its very simple interface, made Muine incomprehensible to people trying to use it for the first time. Amarok I could not configure to meet requirement 1, but I think it's likely I was just missing something, and with its configurability I'm confident that I can set it up to meet requirements 2 and 3.

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• Lifting vehicles (and spawners) using InterActors, strange collisions causing flying vehicles

  - by Gareth Jones

  Making a VCTF map with the Unreal Tournament 3 Editor, and thus have vehicles in it. Currently I have 2 walkways next to each other (Big enough for a vehicle). One of them (A InterActor) drops down, and a grate covers the hole until the vehicle respawns. Once its respawned the InterActor Walkway lifts the vehicle up (and the grate pulls back). However what I'm finding is that the vehicle seems to collide with something when it gets near the top. (Looks something like this: ----_ where _ is the moving InterActor and - is a walkway) I created a new map to test this, and found it seems the front of the scorpion collides with the walkway in front of it, however I don't know why, it physically (in terms of how it looks in game) does not touch the walkway in front of it, but its actions look like it has. Im using InterActors, and a vehicle spawner, looking like so How do I stop this from happening? Right now everything is perfect, except the vehicle keeps flying away every time its lifted up, likes it been forced in between the "lift" and another object!

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• Estimate angle to launch missile, maths question

  - by Jonathan

  I've been working on this for an hour or two now and my maths really isn't my strong suit which is definitely not a good thing for a game programmer but that shouldn't stop me enjoying a hobby surely? After a few failed attempts I was hoping someone else out there could help so here's the situation. I'm trying to implement a bit of faked intelligence when the A.I fires it's missiles at a target in a 2D game world. By predicting the likely position the target will be in given it's current velocity and the time it will take the missile to reach it's target. I created an image to demonstrate my thinking: http://i.imgur.com/SFmU3.png which also contains the logic I use for accelerating the missile after launch. The ship that fires the missile can fire within a total of 40 degree angle, 20 either side of itself, but this could likely become variable. My current attempt was to break the space between the two lines into segments which match the targets width. Then calculate the time it would take the missile to get to that location using the formula. So for each iteration of this we total up the values and that tells us the distance travelled, ad it would then just need compared to distance to the segment. startVelocity * ((startVelocity * acceleration)^(currentframe-1) So for example. If we start at a velocity of 1f/frame with an acceleration of 0.1f the formula, at frame 4, would be 1 * (1.1^3) = 1.331 But I quickly realized I was getting lost when trying to put this into practice. Does this seem like a correct starting point or am I going completely the wrong way about it? Any pointers would help me greatly. Maths really isn't my strong suit so I get easily lost in these matters and don't even really know a good phrase to search for with this. So I guess in summary my question is more about the correct way to approach this problem and any additional code samples on top of that would be great but I'm not averse to working out the complete code from helpful pointers.

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• SSIS Catalog: How to use environment in every type of package execution

  - by Kevin Shyr

  Here is a good blog on how to create a SSIS Catalog and setting up environments.  http://sqlblog.com/blogs/jamie_thomson/archive/2010/11/13/ssis-server-catalogs-environments-environment-variables-in-ssis-in-denali.aspx Here I will summarize 3 ways I know so far to execute a package while using variables set up in SSIS Catalog environment. First way, we have SSIS project having reference to environment, and having one of the project parameter using a value set up in the environment called "Development".  With this set up, you are limited to calling the packages by right-clicking on the packages in the SSIS catalog list and select Execute, but you are free to choose absolute or relative path of the environment. The following screenshot shows the 2 available paths to your SSIS environments.  Personally, I use absolute path because of Option 3, just to keep everything simple for myself. The second option is to call through SQL Job.  This does require you to configure your project to already reference an environment and use its variable.  When a job step is set up, the configuration part will require you to select that reference again.  This is more useful when you want to automate the same package that needs to be run in different environments. The third option is the most important to me as I have a SSIS framework that calls hundreds of packages.  The main part of the stored procedure is in this post (http://geekswithblogs.net/LifeLongTechie/archive/2012/11/14/time-to-stop-using-ldquoexecute-package-taskrdquondash-a-way-to.aspx).  But the top part had to be modified to include the logic to use environment reference. CREATE PROCEDURE [AUDIT].[LaunchPackageExecutionInSSISCatalog] @PackageName NVARCHAR(255) , @ProjectFolder NVARCHAR(255) , @ProjectName NVARCHAR(255) , @AuditKey INT , @DisableNotification BIT , @PackageExecutionLogID INT , @EnvironmentName NVARCHAR(128) = NULL , @Use32BitRunTime BIT = FALSE AS BEGIN TRY DECLARE @execution_id BIGINT = 0; -- Create a package execution IF @EnvironmentName IS NULL BEGIN   EXEC [SSISDB].[catalog].[create_execution]     @package_name=@PackageName,     @execution_id=@execution_id OUTPUT,     @folder_name=@ProjectFolder,     @project_name=@ProjectName,     @use32bitruntime=@Use32BitRunTime; END ELSE BEGIN   DECLARE @EnvironmentID AS INT   SELECT @EnvironmentID = [reference_id]    FROM SSISDB.[internal].[environment_references] WITH(NOLOCK)    WHERE [environment_name] = @EnvironmentName     AND [environment_folder_name] = @ProjectFolder      EXEC [SSISDB].[catalog].[create_execution]     @package_name=@PackageName,     @execution_id=@execution_id OUTPUT,     @folder_name=@ProjectFolder,     @project_name=@ProjectName,     @reference_id=@EnvironmentID,     @use32bitruntime=@Use32BitRunTime; END

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• Unreal 3 Editor (Unreal Tournament 3) Lifting vehicles (and spawners) using InterActors, strange collisions causing flying vehicles

  - by Gareth Jones

  Making a VCTF map with the Unreal Tournament 3 Editor, and thus have vehicles in it. Currently I have 2 walkways next to each other (Big enough for a vehicle). One of them (A InterActor) drops down, and a grate covers the hole until the vehicle respawns. Once its respawned the InterActor Walkway lifts the vehicle up (and the grate pulls back). However what I'm finding is that the vehicle seems to collide with something when it gets near the top. (Looks something like this: ----_ where _ is the moving InterActor and - is a walkway) I created a new map to test this, and found it seems the front of the scorpion collides with the walkway in front of it, however I don't know why, it physically (in terms of how it looks in game) does not touch the walkway in front of it, but its actions look like it has. Im using InterActors, and a vehicle spawner, looking like so How do I stop this from happening? Right now everything is perfect, except the vehicle keeps flying away every time its lifted up, likes it been forced in between the "lift" and another object!

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• PASS: Total Registrations

  - by Bill Graziano

  At the Summit you’ll see PASS announce the total attendance and the “total registrations”.  The total registrations is the sum of the conference attendees and the pre-conference registrations.  A single person can be counted three times (conference plus two pre-cons) in the total registration count. When I was doing marketing for the Summit this drove me nuts.  I couldn’t figure out why anyone would use total registrations.  However, when I tried to stop reporting this number I got lots of pushback.  Apparently this is how conferences compare themselves to each other.  Vendors, sponsors and Microsoft all wanted to know our total registration number.  I was even asked why we weren’t doing more “things” that people could register for so that our number would be even larger.  This drove me nuts. I understand that many of you are very detail oriented.  I just want to make sure you understand what numbers you’re seeing when we include them in the keynote at the Summit.

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• Using HTML5 Today part 4&ndash;What happened to XHTML?

  - by Steve Albers

  This is the fourth entry in a series of descriptions & demos from the “Using HTML5 Today” user group presentation. For practical purposes, the original XHTML standard is a historical footnote, although XHTML transitional will probably live on forever in the default web page templates of old web page editors. The original XHTML spec was released in 2000, on the heels of the HTML 4.01 spec.  The plan was to move web development away from HTML to the more formal, rigorous approach that XHTML offered, but it was built on a principle that conflicts with the history and culture of the Internet: XHTML introduced the idea of Draconian Error Handling, which essentially means that invalid XML markup on a page will cause a page to stop rendering. There is a transitional mode offered in the original XHTML spec, but the goal was to move to D.E.H.  You can see the result by changing the doc type for a document to “application/xhtml+xml” - for my class example we change this setting in the web.config file: <staticContent> <remove fileExtension=".html" /> <mimeMap fileExtension=".html" mimeType="application/xhtml+xml" /> </staticContent> With the new strict syntax a simple error, in this case a duplicate </td> tag, can cause a critical page error: While XHTML became very popular in the ensuing decade, the Strict form of XHTML never achieved widespread use. Draconian Error Handling was one of the factors that led in time to the creation of the WHATWG, or Web Hypertext Application Technology Group.  WHATWG contributed to the eventually disbanding of the XHTML 2.0 working group and the W3C’s move to embrace the HTML5 standard. For developers who long for XML markup the W3C HTML5 standard includes an XHTML5 syntax. For the longer, more definitive look at what happened to XHTML and how HTML5 came to be check out the Dive Into HTML mirror site or Bruce Lawson’s “HTML5: Who, What, When Why” talk.

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• SharePoint Saturday Huntsville Wrap Up

  - by Mark Rackley

  So, Cathy Dew (@catpaint1) and company put on a great SharePoint Saturday event this past weekend. I got to hang out with some old friends and meet some new ones. I’d list you all, but I’d undoubtedly miss someone and don’t want to offend anyone.  Although I find it odd that I see @MossLover now more since she moved to New Jersey than when she lived next door in Kansas City… what’s up with that? Anyway, Cathy did a tremendous job organizing the event.  Everything went smoothly and everyone had a great time. Maybe I can talk her into organizing the rest of SharePoint Saturday Ozarks on June 12th… you know that’s coming up? right? While you’re here why not go ahead and register right now at: http://spsozarks.eventbrite.com/  Yes.. that was a shameless plug… I did my default presentation on “Wrapping Your Head Around the SharePoint Beast”. This continues to be my most popular presentation. I try to tweak it every time and I always have fun doing it. I get to pick on people and they pick on me back, but I always manage to learn something new when I present it. I had a great interactive crowd and they didn’t throw anything at me.  All in all I consider it a success.  Thanks for coming if you attended!  You can get the slides here:  SharePoint Saturday Huntsville - Wrapping Your Head Around the SharePoint Beast Next up for me is SharePoint Saturday DC on May 15th.  Wow this is going to be a huge event with space for 1500 attendees.. no, that is not a typo!  Stop me and say hi if you are able to make it!!

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• The Most Ridiculous Computer Cameos of All Time

  - by Jason Fitzpatrick

  For the last half century computers have played all sorts of major and minor roles in movies; check out this collection to see some of the more quirky and out-of-place appearances. Wired magazine rounds up some of the more oddball appearances of computers in film. Like, for example, the scene shown above from Soylent Green: Spoiler alert: Soylent Green is people! But that’s not the only thing we’re gonna spoil. Soylent Green is set in 2022, and at one point, you’ll notice that a government facility is still using a remote calculator that plugs into the CDC 6600, a machine that was state-of-the-art in 1971. Come to think of it, we should scratch this from the list. This is pretty close to completely accurate. Hit up the link below to check out the full gallery, including a really interesting bit about how the U.S. Government’s largest computer project–once decommissioned and sold as surplus–ended up on the sets of dozens of movies and television shows. The Most Wonderfully Ridiculous Movie Computers of All Time [Wired] Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference

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• Playing Around with WebLogic Maven Plug-In by Flavius Sana

  - by JuergenKress

  Packaged with WebLogic 12c wls-maven-plugin let’s you install, start and stop servers, create domain, execute WLST scripts, compile and deploy applications. The plug-in works with Maven 2.x and 3.x. WebLogic 12c can be downloaded from http://www.oracle.com/technetwork/index.html. Developers version has around  180MB (zip archive).  To install the plugin we need first to extract wls-maven-plugin.jar.pack and pom.xml $unzip ~/Downloads/wls1212_dev.zip wls12120/wlserver/server/lib/wls-maven-plugin.jar.pack $unzip ~/Downloads/wls1212_dev.zip wls12120/wlserver/server/lib/pom.xml Now, let’s unpack the jar file: $unpack200 -r wls12120/wlserver/server/lib/wls-maven-plugin.jar.pack wls12120/wlserver/server/lib/wls-maven-plugin.jar Install the plug-in in the local repository. Read the complete article here. WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Wiki Technorati Tags: Maven,Flavius Sana,WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress

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• Can too much abstraction be bad?

  - by m3th0dman

  As programmers I feel that our goal is to provide good abstractions on the given domain model and business logic. But where should this abstraction stop? How to make the trade-off between abstraction and all it's benefits (flexibility, ease of changing etc.) and ease of understanding the code and all it's benefits. I believe I tend to write code overly abstracted and I don't know how good is it; I often tend to write it like it is some kind of a micro-framework, which consists of two parts: Micro-Modules which are hooked up in the micro-framework: these modules are easy to be understood, developed and maintained as single units. This code basically represents the code that actually does the functional stuff, described in requirements. Connecting code; now here I believe stands the problem. This code tends to be complicated because it is sometimes very abstracted and is hard to be understood at the beginning; this arises due to the fact that it is only pure abstraction, the base in reality and business logic being performed in the code presented 1; from this reason this code is not expected to be changed once tested. Is this a good approach at programming? That it, having changing code very fragmented in many modules and very easy to be understood and non-changing code very complex from the abstraction POV? Should all the code be uniformly complex (that is code 1 more complex and interlinked and code 2 more simple) so that anybody looking through it can understand it in a reasonable amount of time but change is expensive or the solution presented above is good, where "changing code" is very easy to be understood, debugged, changed and "linking code" is kind of difficult. Note: this is not about code readability! Both code at 1 and 2 is readable, but code at 2 comes with more complex abstractions while code 1 comes with simple abstractions.

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• Hybrid Graphics on Ubuntu 12.04 switching to discrete

  - by cfstras

  I have a Sony Vaio VPCCB-27FX with hybrid graphics. Using vgaswitcheroo enables me to switch my discrete card off to save power. Now when i want to switch to the discrete card for performance, my system freezes. I already tried logging out and killing x with service lightdm stop, but still, it freezes as soon as I echo DIS > switch. typing blindly, echo IGD > switch returns me to my console where it reads [ 179.555171] i915: switched off, but it seems the discrete card never gets switched on... running echo DDIS > switch gives me the following: [540....] [drm:atop_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting [540....] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CEE2 (len 62, WS 0, PS 0) @ 0xCEFE [540....] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing BBF6 (len 1036, WS 4, PS 0) @ 0xBCF3 [540....] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing BB8C (len 76, WS 0, PS 0) @ 0xBB94 [541....] [drm:r600_RING_TEST] *ERROR* radeon: ring test failed (scratch(0x8504)=0xFFFFFFFF) [541....] [drm:evergreen_resume] *ERROR* evergreen startup failed on resume after that, the atombios part repeats a few times. also, the terminal locks up again and sysrq+REISUB is my only rescue. Has anybody an idea how I can switch to my discrete card without the system locking up? #uname -srvmpio Linux 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux #lsb_release -r Description: Ubuntu 12.04 LTS

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• IRQ Conflicts Causing Video Card and Boot Problems?

  - by sanpatricio

  tl;dr - I have 4 devices sharing 1 IRQ. Is this bad and how do I tell the BIOS to stop it? Background: I have an old Dell GX280 dual Pentium 4 that I (semi) resurrected last weekend with an installation of Ubuntu 12.04. Everything was going fine the first several hours until a problem that plagued me when WinXP was on that machine happened -- it froze. Completely froze. None of the myriad of ways I have found here on askubuntu helped me to regain control except a long-press of the power button to shut it off. Clearly, this wasn't a software/WinXP issue. After much googling, I found that hardware conflicts can often cause this sort of total lock-up and with all the odd blocks of yellow and flecks of color showing on my screen (both WinXP and Ubuntu) I figured my old GeForce 7600 was failing and causing me these odd issues. (A good canned-air dusting of the entire interior fixed the color fleck problem) Again, through much googling and numerous answers found on askubuntu, I somehow stumbled my way onto the lshw command. After going through it, line by line, I found that I have four devices sharing IRQ 16: eth0, wlan0, ide0 (DVD-RW), and my video card. In hindsight, I can recall weird instances of my Ethernet connection to another computer not working when I thought it should. I never full troubleshot those issues so it could be a coincidence. The other thing that has been plaguing me since installing Ubuntu (wasn't there during WinXP) has been periodic moments of my monitor getting no signal from Ubuntu during boot. The first couple days, it would disappear after the Dell boot screen and reappear at Ubuntu login. Now, it disappears after the Dell boot screen and doesn't return at all -- I have to hit F12 where I can load a safe mode version of Ubuntu and get more details like dmesg and lsdev. I also ran memtest86 overnight and woke up to zero errors, so failing RAM is out. Where do I go from here?

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• The last word on C++ AMP...

  - by Daniel Moth

  Well, not the last word, but the last blog post I plan to do here on that topic. Over the last 12 months, I have published 45 blog posts related to C++ AMP on the Parallel Programming in Native Code, and the rest of the team has published even more. Occasionally I'll link to some of them from my own blog here, but today I decided to stop doing that - so if you relied on my personal blog pointing you to C++ AMP content, it is time you subscribed to the msdn blog. I will continue to blog about other topics here of course, so stay tuned. So, for the last time, I encourage you to read the latest two blog posts I published on the team blog bringing together essential reading material on C++ AMP Learn C++ AMP - a collection of links to take you from zero to hero. Present on C++ AMP - a walkthrough on how to give a presentation including slides. Got questions on C++ AMP? Hit the msdn forum! Comments about this post by Daniel Moth welcome at the original blog.

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• Ubuntu 10.04 hung on unattended apt-get upgrade?

  - by hafichuk

  I'm looking into why our ubuntu web server hung this morning and see that there was some package upgrades a few hours prior to the problem. I was able to ssh into the system and get a snapshot from top: top - 08:13:54 up 210 days, 8:25, 2 users, load average: 433.30, 422.40, 375.70 Tasks: 1192 total, 381 running, 810 sleeping, 0 stopped, 1 zombie Cpu(s): 0.5%us, 6.1%sy, 0.0%ni, 93.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 49549772k total, 48518392k used, 1031380k free, 960152k buffers Swap: 11595768k total, 279368k used, 11316400k free, 39355664k cached This is a 16 processor system, so I would typically expect a load in the low teens. I tried to restart apache, which didn't work, and subsequently had to do a hard reboot to get it working again (which it is). One thing I found was that the server did an unattended package update. Is it possible that upgrading php or curl (which our web sites use) might have caused apache to stop responding? Here is the snip from the unattended-upgrades.log from this morning: 2012-09-18 06:48:30,076 INFO Initial blacklisted packages: 2012-09-18 06:48:30,076 INFO Starting unattended upgrades script 2012-09-18 06:48:30,077 INFO Allowed origins are: ["['Ubuntu', 'lucid-security']"] 2012-09-18 06:49:37,017 INFO Packages that are upgraded: gnupg-curl php5-dev linux-server dhcp3-common linux-libc-dev php5-curl gpgv gnupg linux-headers-server linux-image-server php5 php5-mysql php-pear php5-cli php5-common libapache2-mod-php5 dhcp3-client 2012-09-18 06:49:37,018 INFO Writing dpkg log to '/var/log/unattended-upgrades/unattended-upgrades-dpkg_2012-09-18_06:49:37.017909.log'

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• Network configuration problem

  - by Musti

  in my dorm I have to change network configuration and then if it is successfull, I have to enter a user name and password for wired internet connection. Anyway, I had many attempts but I couldnt achieve, and please look at my steps and tell me if there is something wrong and at the end there is an error, but I really dont have any idea about this error. (I am a new ubuntu user, and network is far away of my interests) 1) /etc/network/interfaces auto eth0 iface eth0 inet static address 172.030.014.038 netmask 255.255.255.252 network 192.168.2.0 broadcast 192.168.2.255 gateway 172.030.014.038 2) sudo gedit /etc/resolv.conf nameserver 010.050.001.001 nameserver 010.050.001.002 3) /etc/init.d/networking stop Deconfiguring network interfaces... [ OK ] 4) /etc/init.d/networking restart Running /etc/init.d/networking restart is deprecated because it may not enable again some interfaces Reconfiguring network interfaces... 172.030.014.038: Unknown host ifconfig: `--help' gives usage information. Failed to bring up eth0 Note: IP-address, netmask, gateway, Preferred DNS server and Alternate DNS server ara given by the management of Dorm. It wad very easy in windows but I couldnt achieve in Ubuntu. I also tried to edit from "edit connections" but the save button is gray and I cannot save it. Thanks in advance. / Musti

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• What did Rich Hickey mean when he said, "All that specificity [of interfaces/classes/types] kills your reuse!"

  - by GlenPeterson

  In Rich Hickey's thought-provoking goto conference keynote "The Value of Values" at 29 minutes he's talking about the overhead of a language like Java and makes a statement like, "All those interfaces kill your reuse." What does he mean? Is that true? In my search for answers, I have run across: The Principle of Least Knowledge AKA The Law of Demeter which encourages airtight API interfaces. Wikipedia also lists some disadvantages. Kevlin Henney's Imperial Clothing Crisis which argues that use, not reuse is the appropriate goal. Jack Diederich's "Stop Writing Classes" talk which argues against over-engineering in general. Clearly, anything written badly enough will be useless. But how would the interface of a well-written API prevent that code from being used? There are examples throughout history of something made for one purpose being used more for something else. But in the software world, if you use something for a purpose it wasn't intended for, it usually breaks. I'm looking for one good example of a good interface preventing a legitimate but unintended use of some code. Does that exist? I can't picture it.

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• Ask the Readers: How Do You Monitor Your Computer?

  - by Jason Fitzpatrick

  Beneath the shiny case of your computer and GUI of your operating system there’s a lot–CPU utilization, memory access, and disk space consumption to name a few things–you can keep an eye on. How do you keep an eye on resource utilization and more on your computer? Image available as wallpaper here. Whether you’re carefully managing a small pool of RAM, making sure your abundant apps don’t bog down your processor, or you just like having an intimate view of what’s going on in the guts of your computer, we want to hear all about the tools you use to do it. How and why do you monitor your computer? From disk use to case temps, any kind of monitoring is fair game. Sound off in the comments with the how and why of your monitoring arrangement and then be sure to stop back in on Friday for the What You Said roundup to see what tricks and tools your fellow readers are using to keep an eye on their hardware. HTG Explains: How Antivirus Software Works HTG Explains: Why Deleted Files Can Be Recovered and How You Can Prevent It HTG Explains: What Are the Sys Rq, Scroll Lock, and Pause/Break Keys on My Keyboard?

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