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• Cursor seems to freeze in the first attempt of typing - Unity 3D, 12.04

  - by Denis

  It happens in the first attempt of typing, no matter is after the startup, or 5 minutes later, or then after. The cursor (or maybe it's the system) seems to freeze, no matter the application I use, taking up 5 sec to appear what is typed. Subsequently, everything is normal, using another applications. @Anwar Shah suggested it could be a daemon waiting to run before the lauching of the first application. Turning off Zeitgest didn't help. It occurs only with Unity-3d. Tested with Unity-2d, everything is fine. Tried to change some Compiz settings, nothing worked, although not tested with every single parameter. Also I deactivated Ati proprietary driver, no effect. My system: AMD E350 1.6Gh, 2G-Ram, ATI graphics - Ubuntu 12.04, 64bits. Update 1: the cursor is blinking normally before I start typing. After the first character (which is not showed), seems to freeze, taking 5 seconds to get normal again. Very annoying, specially when you want to access login sites. Update 2: I tested on a different and old machine (Athlon 64 4800 x2, 4Gb ram, no problems - takes 2 seconds, acceptable. I think it could be related to my specific hardware (Samsung RV415), but not sure about it. Anyone experiencing something similar? Is that what I should expect, or can be fixed or improved? Thanks.

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• Can't detect collision properly using Rectangle.Intersects()

  - by Daniel Ribeiro

  I'm using a single sprite sheet image as the main texture for my breakout game. The image is this: My code is a little confusing, since I'm creating two elements from the same Texture using a Point, to represent the element size and its position on the sheet, a Vector, to represent its position on the viewport and a Rectangle that represents the element itself. Texture2D sheet; Point paddleSize = new Point(112, 24); Point paddleSheetPosition = new Point(0, 240); Vector2 paddleViewportPosition; Rectangle paddleRectangle; Point ballSize = new Point(24, 24); Point ballSheetPosition = new Point(160, 240); Vector2 ballViewportPosition; Rectangle ballRectangle; Vector2 ballVelocity; My initialization is a little confusing as well, but it works as expected: paddleViewportPosition = new Vector2((GraphicsDevice.Viewport.Bounds.Width - paddleSize.X) / 2, GraphicsDevice.Viewport.Bounds.Height - (paddleSize.Y * 2)); paddleRectangle = new Rectangle(paddleSheetPosition.X, paddleSheetPosition.Y, paddleSize.X, paddleSize.Y); Random random = new Random(); ballViewportPosition = new Vector2(random.Next(GraphicsDevice.Viewport.Bounds.Width), random.Next(GraphicsDevice.Viewport.Bounds.Top, GraphicsDevice.Viewport.Bounds.Height / 2)); ballRectangle = new Rectangle(ballSheetPosition.X, ballSheetPosition.Y, ballSize.X, ballSize.Y); ballVelocity = new Vector2(3f, 3f); The problem is I can't detect the collision properly, using this code: if(ballRectangle.Intersects(paddleRectangle)) { ballVelocity.Y = -ballVelocity.Y; } What am I doing wrong?

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• How do I keep controversy in check?

  - by Aaron Digulla

  This is probably OT but it's less OT here than on any other SO site, so please bear with me. I'm working on a new project votEm. The goal is to give independent candidates a platform to introduce themselves to get elected for a political office. My main reason is that today, it's too expensive to run for an office. Some politicians in the US spend as much as 30 million dollars (!) for a single campaign. That money is better spent elsewhere. In a similar fashion, people who want to change countries like Egypt, could use such a platform to present themselves. Now I expect a lot of emotions and pressure on my site. People with a lot of money (and a lot to lose) will try to game it (political parties, secret services of ... errr ... "not 100% democratic countries", big companies, ...) To avoid as many mistakes as possible, I need a list of resources, ideas and tips how to keep such a site out of too much trouble. PS: I'd make this CW but the option seems to be gone...

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• nfs server on cygwin slow

  - by Weltenwanderer

  The setup: We run an instance of cygwin nfsd on a Windows 2008 Server (Xeon 3,2 GHz). There are several Sun Solaris and SunOS machines accessing the shares. This is the exports file: /disk3 (rw,all_squash) /disk2 (rw,all_squash) Those paths are soft linked to the relevant cygdrive/d/path/to/dir paths. Some of the folders contain up to 10k files. The Problem: ls -la on the mounted folder on the sun boxes takes 2 - 3 minutes and the general read performance is really bad. cat filename displays the file in slow bursts and this hurts performance on tasks that access those shared files heavily. Processor load is not the issue, the nfs server idles most of the time, the cygwin tasks never get over 1% load.

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• What's the proper term for a function inverse to a constructor - to unwrap a value from a data type?

  - by Petr Pudlák

  Edit: I'm rephrasing the question a bit. Apparently I caused some confusion because I didn't realize that the term destructor is used in OOP for something quite different - it's a function invoked when an object is being destroyed. In functional programming we (try to) avoid mutable state so there is no such equivalent to it. (I added the proper tag to the question.) Instead, I've seen that the record field for unwrapping a value (especially for single-valued data types such as newtypes) is sometimes called destructor or perhaps deconstructor. For example, let's have (in Haskell): newtype Wrap = Wrap { unwrap :: Int } Here Wrap is the constructor and unwrap is what? The questions are: How do we call unwrap in functional programming? Deconstructor? Destructor? Or by some other term? And to clarify, is this/other terminology applicable to other functional languages, or is it used just in the Haskell? Perhaps also, is there any terminology for this in general, in non-functional languages? I've seen both terms, for example: ... Most often, one supplies smart constructors and destructors for these to ease working with them. ... at Haskell wiki, or ... The general theme here is to fuse constructor - deconstructor pairs like ... at Haskell wikibook (here it's probably meant in a bit more general sense), or newtype DList a = DL { unDL :: [a] -> [a] } The unDL function is our deconstructor, which removes the DL constructor. ... in The Real World Haskell.

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• WMII Terminal Width of 80 Columns for xterm (colrules)

  - by BCable

  I'm trying to get WMII to split horizontally at 80 columns for xterm, but I'm only seeing a way to do this via percentage. It would be nice to be able to set it by something other than percentage for various resolutions, but if I have to deal with that I will. The problem is that even percentages don't work at my resolution (1366x768). 47+47 in /colrules yields 79 characters and 48+48 yields 81 characters. As far as I can tell, there is no decimal system allowed so I could do 47.5 for instance. I came from Ion3 and I'm used to using 80 column terminals, resizable by the keyboard, to get a reasonable cut off point for VIM when I'm coding. I would just settle with using the mouse, but WMII seems to be much more fluid than Ion3, so I would have to do it a LOT, which sounds annoying. Any ideas?

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• Why does gvim open session with extra/duplicate tabs?

  - by drapkin11

  I'm running gvim, have 2 files open in 2 tabs. I save the current session via the sessionman plugin by Yuri Klubakov. I close gvim (or keep gvim open but close the session, doesn't matter). When I reopen gvim and load the session, I have 3 tabs opened - two of the tabs have the same file! This is not just limited to this single session. When I open some of my other sessions, gvim opens about twice the number of tabs that I expect it to. I disabled this plugin and tried another (session by Peter Odding), but I still get the same problem. Any idea what might be going on behind the scenes?

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• CodePlex Daily Summary for Sunday, July 21, 2013

  CodePlex Daily Summary for Sunday, July 21, 2013Popular ReleasesMagick.NET: Magick.NET 6.8.6.601: Magick.NET linked with ImageMagick 6.8.6.6.MISAO: Ver. 5.33: Latest app and add-insC# Intellisense for Notepad++: Initial release: Members auto-complete Integration with native Notepad++ Auto-Completion Auto "open bracket" for methods Right-arrow to accept suggestions51Degrees.mobi - Mobile Device Detection and Redirection: 2.1.19.4: One Click Install from NuGet This release introduces the 51Degrees.mobi IIS Vary Header Fix. When Compression and Caching is used in IIS, the Vary header is overwritten, making intelligent caching with dynamic content impossible. Find out more about installing the Vary Header fix. Changes to Version 2.1.19.4Handlers now have a ‘Count’ property. This is an integer value that shows how many devices in the dataset that use that handler. Provider.cs -> GetDeviceInfoByID to address a problem w...SalarDbCodeGenerator: SalarDbCodeGenerator v2.1.2013.0719: Version 2.1.2013.0719 2013/7/19 Pattern Changes: * DapperContext pattern is added. * All patterns are updated to work with one-to-one relations. Changes: * One-to-one relation is supported. * Minor bug fixes.Player Framework by Microsoft: Player Framework for Windows and WP (v1.3 beta 2): Includes all changes in v1.3 beta 1 Additional support for Windows 8.1 Preview New API (JS): addTextTrack New API (JS): msKeys New API (JS): msPlayToPreferredSourceUri New API (JS): msSetMediaKeys New API (JS): onmsneedkey New API (Xaml): SetMediaStreamSource method New API (Xaml): Stretch property New API (Xaml): StretchChanged event New API (Xaml): AreTransportControlsEnabled property New API (Xaml): IsFullWindow property New API (Xaml): PlayToPreferredSourceUri proper...Outlook 2013 Add-In: Multiple Calendars: As per popular request, this new version includes: - Support for multiple calendars. This can be enabled in the configuration by choosing which ones to show/hide appointments from. In some cases (public folders) it may time out and crash, and so far it only supports "My Calendars", so not shared ones yet. Also they're currently shown in the same font/color so there are no confusions with color categories, but please drop me a line on any suggestions you'd like to see implemented. - Added fri...Circuit Diagram: Circuit Diagram 2.0 Beta 2: New in this release: Show grid in editor Cut/copy/paste support Bug fixesDaRenamer: Renamer 2.1.0.5: Version 2.1.0.5 -fixed minor bugInstall Verify Tool: Install Verify Tool V 1.0: Win Service Web Service Win Service Client Web Service ClientOrchard Project: Orchard 1.7 RC: Planning releasedTerminals: Version 3.1 - Release: Changes since version 3.0:15992 Unified usage of icons in user interface Added context menu in Organize favorites grid Fixed:34219 34210 34223 33981 34209 Install notes:No changes in database (use database from release 3.0) No upgrade of configuration, passwords, credentials or favorites See also upgrade notes for release 3.0PMU Connection Tester: PMU Connection Tester v4.4.0: This is the current release build of the PMU Connection Tester, version 4.4.0 This version of the connection tester was released with openPDC 1.5 SP1 and openPDC 2.0 BETA. This application requires that .NET 4.0 already be installed on your system. Note this is the last release of the PMU Connection Tester that will built on .NET 4.0 using the TVA Code Library and the Time-series Framework. Future releases of the PMU Connection Tester will be built on .NET 4.5 (or later) using the Grid Sol...HiUpdateTools - easy publish and update your app: HiUpdateTools Add-in 1.0.0.5: - Generate ClientConfig.xml and adding to the project - Set ClientConfig.xml option "CopyToOutputDirectory"= Copy if newer - Fix client path not ending the backslash - Add Client assembly to VSX package - On first use, the tool is added to the reference to the client assembly - Fix client application - Multi-instance application - Run single instance of update applicationopen gaze and mouse analyzer: Ogama 4.4 BETA: This beta was published on 16.07.2013 and includes fixes and improvements since last 4.3 release, mainly in the recording section which solves problems with tobii and mirametrix devices, see the source code tab for details. Please test it, if you have one of this devices and give me feedback using the issue tracker or discussion tabs. Don´t forget to install .Net 4 framework and SQL Express before installing Ogama. When using Tobii tracking devices, you have to install apple bonjour also. On...SpaceFlight: SpaceFlight_v1.1: Added VCRedist.exe , run this first if you get the "MSVCP100.dll is missing" issueAdvanced Resource Tab for Blend: Advanced Resource Tab 2.0: Added filtering of (sub)-resource items and collapsing / expanding of all resource dictionaries.Media Companion: Media Companion MC3.573b: XBMC Link - Let MC update your XBMC Library Fixes in place, Enjoy the XBMC Link function Well, Phil's been busy in the background, and come up with a Great new feature for Media Companion. Currently only implemented for movies. Once we're happy that's working with no issues, we'll extend the functionality to include TV shows. All the help for this is build into the application. Go to General Preferences - XBMC Link for details. Help us make it better* Currently only tested on local and ...Wsus Package Publisher: Release v1.2.1307.15: Fix a bug where WPP crash if 'ShowPendingUpdates' is start with wrong credentials. Fix a bug where WPP crash if ArrivalDateAfter and ArrivalDateBefore is equal in the ComputerView. Add a filter in the ComputerView. (Thanks to NorbertFe for this feature request) Add an option, when right-clicking on a computer, you can ask for display the current logon user of the remote computer. Add an option in settings to choose if WPP ping remote computers using IPv4, IPv6 or IPv6 and, if fail, IP...Lab Of Things: vBeta1: Initial release of LoTNew ProjectsBlindspot: This project aims to create a fully-functional windowless desktop application allowing blind/visually impaired music fans the chance to access Spotify.HelloReading: ???????MonteMediaCC: The Monte Media Library is a Java library for processing media data. Supported media formats include still images, video, audio and meta-data. NETDeob: Deobfuscator and Unpacker for .NET Files.NthCatalanNumber: Write a program to calculate the Nth Catalan number by given N. http://en.wikipedia.org/wiki/Catalan_numberPokemon Battle Online 0791: ???????project site: the-west minimapPSeG Server FIles: PSeG Server FilesSample VariableSizedWrapGrid: This is an example of the use of particular VariableSizedWrapGrid GridView control. Where we can set the size of each item as needed It can make an appearance oServices Monitoring Management Pack: La supervision des services automatiques est un élément qui est déficient dans Operations Manager. Ce « Management Pack » sert à surveiller les services automatSinaIsTestingHisNewProject: this project is only for testing this site and any copying without my permission will be sewed by me and will be tracked by CIA and FBI and will be HeadShotSum of a sequence: Write a program that, for a given two integer numbers N and X, calculates the sumS = 1 + 1!/X + 2!/X2 + … + N!/XN Synchrophasor Analytics: Synchrophasor Analytics is a front end data processing and conditioning for downstream phasor based applications and an extension for development and analysis.tcp-bridge: a tcp bridge service to redirect incoming connections to another machine by using another incoming or outgoing connectionTypeScript Class Library: The TypeScript Class Library WPDialog: Library for developing app dialogs for Windows phone similar to Monotouch.DialogWPF File Renamer: Simple file renaming application made to brush up on my WPF data binding and MVVM skills.

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• What is an appropriate language for expressing initial stages of algorithm refinement?

  - by hydroparadise

  First, this is not a homework assignment, but you can treat it as such ;). I found the following question in the published paper The Camel Has Two Humps. I was not a CS major going to college (I majored in MIS/Management), but I have a job where I find myself coding quite often. For a non-trivial programming problem, which one of the following is an appropriate language for expressing the initial stages of algorithm refinement? (a) A high-level programming language. (b) English. (c) Byte code. (d) The native machine code for the processor on which the program will run. (e) Structured English (pseudocode). What I do know is that you usually want to start your design implementation by writing down pseuducode and then moving/writing in the desired technology (because we all do that, right?) But I never thought about it in terms of refinement. I mean, if you were the original designer, then you might have access to the original pseudocode. But realisticly, when I have to maintain/refactor/refine somebody elses code, I just keep trucking with the language it currently resides in. Anybody have a definitive answer to this? As a side note, I did a quick scan of the paper as I havn't read every single detail. It presents various score statistics, can't find where the answers are with the paper.

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• How to create multiple OS on same DVD [duplicate]

  - by learner

  This question already has an answer here: How to make a multiboot CD that will start a user-chosen ISO file 7 answers I searched this forum but there are only general answers which doesn't give me desired output. Here is what I want to do. I have (1). Windows 7 ISO (2). Windows 8.1 previews ISO and (3). Ubuntu 12.10 ISO files. Using which I want to create single bootable DVD, so that after creating DVD it should ask to choose to install between 3 OS. Is it possible? If so please help me.

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• Can I use an nVidia Geforce 9600GT for triple-monitor?

  - by John Rudy

  My work PC has (as you can guess from the title) a single Geforce 9600GT card. According to the spec page for this card, both DVI ports are Dual-Link DVI. Both are currently in use on Dell 19" 1280x1024 screens. I'm running Windows 7, with Aero enabled, for what that's worth. What I'm wondering is if I can use a standard DVI splitter cable to drive a third screen from one of the ports -- specifically a Samsung 22" 1680x1050. I'm really outgrowing the two-screen setup, and am strongly considering bringing in my home monitor (which is almost never used) to bolster my usable space. If I can't, then my alternative is to replace one of these Dells with that Samsung, to give me at least a "little" more space. (Before you ask, there's probably no chance I can get my company to spring for a second video card and third monitor. Even if I could, it would not be politically expedient, as a number of my other coworkers are already pretty jealous at my setup.)

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• Open Source Visualization and Dashboard Software

  - by helios

  I am working on an open source Application Performance Monitoring (APM) software and looking for a visualization tool with dashboard capabilities. I came across Graphite which looks pretty good but wondering if there is anything better out there before I settle down with that tool. Here's the list of features I am interested in: Must-Have Open Source license API to submit real time data Web-based visualization interface Persistence - file or database Nice-To-Have Dashboard Capabilities: Allow users to select a few metrics (CPU, Heap Usage, # of Active Users etc.) and place them on a single page for easier monitoring. Any suggestions?

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• Huge area of stuck pixels

  - by pixelady

  A toddler slammed down my laptop screen while an iPod was laying on top of the keyboard. The damage resulted in a massive area of stuck pixels on the laptop screen, approximately 2 inches by 10 inches in area. I've tried running various programs that rapidly flick the pixels in different colors, as well as massaging the screen with heat and also without heat. These are the standard methods I read about for fixing a stuck pixel. But none of the online articles I read said how to fix a huge area of pixels, not just single pixels. What else can I try to get the many pixels unstuck? My computer is no longer under warranty and I don't want to buy a new one.

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• How can I remove the DRM from books I have purchased for my Kindle? [closed]

  - by Jeremy Banks

  How can I the remove DRM from books I have purchased for my Kindle? A solution that works on Mac OS X and/or Linux would be ideal, but a Windows-only solution is also acceptable. Moral aside: I do not plan to share or pirate books; I am very happy with the Amazon Kindle store and have purchased more books from there since getting my Kindle a month ago than I had in the previous two years. However, I do not feel comfortable keeping them in an encrypted format that only a single company's software will allow me to access. I may also want to convert them into a format for other readers in the future, which is not possible without first removing the DRM.

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• How to rename everything matching a certain string in a folder

  - by lostiniceland

  Hello Everyone I am running Linux and I have some basic console knowledge but my current problem is quite difficult and I dont know how to achieve this. I want/need to rename everything within a folder that matches a given string. By everything I mean folders/files content within a file content in hidden files Basically I want to refactor a Java-project. Sure, I could use Eclipse to handle the replacing, but this leaves out the folders or resources outside of my workspace. I was thinking of a script that could do the job for me but this seems rather tricky. For instance when it comes to folder-/file-rename I want to replace only the part of the name that matches my string, the rest should remain untouched. Maybe someone already has something like this in his/her script-collection :-) Thanks in advance Marc

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• php redirect pages under folder to different domain

  - by matt wilkie

  Using php, how might I redirect all pages under a folder to a different domain? Current site: http://www.example.org/dept http://www.example.org/dept/stuff http://www.example.org/dept/more http://www.example.org/dept/more/stuff New site: http://www.example-too.org/pets/stuff http://www.example-too.org/pets/more http://www.example-too.org/pets/more/stuff I've learned about how to redirect a single page: <? Header( "HTTP/1.1 301 Moved Permanently" ); Header( "Location: http://www.example-too.org/pets/more/stuff" ); ?> but how to apply this to dozens of pages without creating a php redirect for each one? I can't do this using apache mod_rewrite and .htaccess is disabled. thanks.

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• Visual Studio .NET 2003 on Windows 7 hangs on search

  - by Nikhil

  So I have Visual Studio 2003 running on Windows 7 - yeah I am aware it isn't officially supported - and no, unfortunately I can't change that situation :-( For the most part it works OK but I have a specific problem, that I can't figure out. The application hangs if you do a project wide search (Ctrl - Shift - F) for a string. I have a reasonably powerful machine and all the other heavy tasks like compiling and debugging all work fine. It also works if I restrict the search to the current document (Ctrl - F). I am running it as administrator and VS.NET 2003 SP1 has been applied. The size of the project does not seem to be a problem since a colleague is also experiencing this issue for a single project solution containing 5 pages. I am currently using Windows Search as a work-around and I was wondering if there is something I missed that I should try. PS: I have asked this question on stack overflow as well - but I suspect this might be problem with Windows 7 OS - so I thought I'd cross post it here as well.

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• Google Analytics: How long does it take users to trigger an event

  - by Stephen Ostermiller

  I implemented Google Analytics event tracking on my currency conversion website. The typical user flow is: User lands on a page about two currencies. User enters an amount to be converted. The site shows the user the value in the other currency. The JavaScript sends Google Analytics an "converted" event when the currency conversion is done. Because most of the sessions on my site are single page, the event tracking is very important to me to be able to know if users find my page useful. I'm looking for a way to be able to figure out how long it typically takes users to enter a value in the form. I expect that this data would form a bell curve with around a specific amount of time after page load. If I can't get a graph, I could make do with a median value. I would like to be able to use this as a core metric around usability testing. Is there a way to get this information out of Google Analytics?

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• What are working xorg.conf settings for using a Matrox TripleHead2Go @ 5040x1050?

  - by Brendan Abel

  I'm trying to configure xorg.conf to correctly set the resolution of my screens. I'm using a matrox triplehead, so the monitor is a single 5040x1050 screen. Unfortunately, it's being incorrectly set to 3840x1024. Here is my xorg.conf: # nvidia-settings: X configuration file generated by nvidia-settings # nvidia-settings: version 260.19.06 (buildd@yellow) Mon Oct 4 15:59:51 UTC 2010 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" Option "Xinerama" "0" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" # HorizSync source: edid, VertRefresh source: edid Identifier "Monitor0" VendorName "Unknown" ModelName "Matrox" HorizSync 31.5 - 80.0 VertRefresh 57.0 - 75.0 #Option "DPMS" Modeline "5040x1050@60" 451.27 5040 5072 6784 6816 1050 1071 1081 1103 #Modeline "5040x1050@59" 441.28 5040 5072 6744 6776 1050 1071 1081 1103 #Modeline "5040x1050@57" 421.62 5040 5072 6672 6704 1050 1071 1081 1103 EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce 9800 GTX+" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 Option "TwinView" "0" Option "metamodes" "5040x1050" SubSection "Display" Depth 24 EndSubSection EndSection

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• Folder permissions, red x on user object

  - by Matt Bear

  This question was asked before but was no answer. On shared folders on the file server, for the domain user name object under the security tab, the icon has a red x. There are no symptoms, the users have full access, there is just a red x on the icon for their name. Why is this? For clarification, logged into the windows 2008 r2 file server, browse to a users shared folder, right click on the folder, hit properties, click the security tab. The object representing the users domain name has a little red x on the lower right hand corner of the icon that looks like a single man. There are no symptoms beyond me wondering why the red x is there.

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• LiveMeeting VC PowerShell PASS – Troubleshooting SQL Server with PowerShell

  - by Laerte Junior

  Guys, join me on Wednesday July 18th 12 noon EDT (GMT -4) for a presentation called Troubleshooting SQL Server With PowerShell. It will be in English, so please make allowances for this. I’m sure that you’re aware that my English is not perfect, but it is not so bad. I will do my best, you can be sure. The registration link will be available soon from PowerShell.sqlpass.org, so I hope to see you there. It will be a session without slides. Just code; pure PowerShell code. Trust me, We will see a lot of COOL stuff.Big thanks to Aaron Nelson (@sqlvariant) for the opportunity! Here are some more details about the presentation: “Troubleshooting SQL Server with PowerShell – The Next Level’ It is normal for us to have to face poorly performing queries or even complete failure in our SQL server environments. This can happen for a variety of reasons including poor Database Designs, hardware failure, improperly-configured systems and OS Updates applied without testing. As Database Administrators, we need to take precaution to minimize the impact of these problems when they occur, and so we need the tools and methodology required to identify and solve issues quickly. In this Session we will use PowerShell to explore some common troubleshooting techniques used in our day-to-day work as s DBA. This will include a variety of such activities including Gathering Performance Counters in several servers at the same time using background jobs, identifying Blocked Sessions and Reading & filtering the SQL Error Log even if the Instance is offline The approach will be using some advanced PowerShell techniques that allow us to scale the code for multiple servers and run the data collection in asynchronous mode.

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• It could be worse....

  - by Darryl Gove

  As "guest" pointed out, in my file I/O test I didn't open the file with O_SYNC, so in fact the time was spent in OS code rather than in disk I/O. It's a straightforward change to add O_SYNC to the open() call, but it's also useful to reduce the iteration count - since the cost per write is much higher: ... #define SIZE 1024 void test_write() { starttime(); int file = open("./test.dat",O_WRONLY|O_CREAT|O_SYNC,S_IWGRP|S_IWOTH|S_IWUSR); ... Running this gave the following results: Time per iteration 0.000065606310 MB/s Time per iteration 2.709711563906 MB/s Time per iteration 0.178590114758 MB/s Yup, disk I/O is way slower than the original I/O calls. However, it's not a very fair comparison since disks get written in large blocks of data and we're deliberately sending a single byte. A fairer result would be to look at the I/O operations per second; which is about 65 - pretty much what I'd expect for this system. It's also interesting to examine at the profiles for the two cases. When the write() was trapping into the OS the profile indicated that all the time was being spent in system. When the data was being written to disk, the time got attributed to sleep. This gives us an indication how to interpret profiles from apps doing I/O. It's the sleep time that indicates disk activity.

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• a load balancing scenario using HAProxy and keepalived shows no performance advantage

  - by chakoshi

  Hi, I am trying to setup a load balanced web server scenario, using two HAproxy load balancers and two debian web servers following this guide http://www.howtoforge.com/setting-up-a-high-availability-load-balancer-with-haproxy-keepalived-on-debian-lenny. the setup is working but the results of simple performance benchmarking is not what I expected. I tried apache benchmark tool to send lots of requests to servers (one time directly testing one of the web servers and the other time testing through the load balancer) using the command "ab -n 1000000 -c 500 http://IP/index.html", but the test results shows better performance for the single server without load balancer. can any one tell me if I'm going wrong on some thing?

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• Trying to make changes to the size of the events buffer in prelude-ids auditd plugin

  - by tharris

  I am running systems using the prelude-ids plugin for auditd. When the manager is up every thing works fine however I have a requirement that when the clients can't talk to the manager they should store no more than 250MB of messages, and when they hit that point they should start deleting the oldest events. All I can find is that audispd can be set to an overflow action of ignore,syslog,suspend,single, and halt none of which meet my requirement, and several of which I really cannot use. Does anyone know a way to do this? I know the events get stored in /var/spool/prelude/auditd/global, but I can't find anything about configuring how things are stored here. There are usually several files in the global directory but only 2 of them ever go above 0 in size, data0 and data0.journal.

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• Windows 2008 Domain Controller - Backup (BDC) to Primary (PDC)

  - by Klaptrap

  I have created a new domain controller with my single domain forest. I have also made it DHCP and DNS ready - all 3 services have synchronised with the existing W2K8 domain controller. I even migrated the FSMO roles and thought everything was fine. Indeed all machines on network appear to obtain DHCP and DNS from new server and the AD is working on the new server as my internal website uses it for login authentication. I have just noticed, via BgInfo - Sys Internals - that the new server is showing as "backup" and the old as "primary" - I thought I had already achieved this. Have the FSMO roles swapped back - as I have yet to have removed the old server from AD (dcpromo). Do I need to do anything before I run dcpromo on the old server? Any thoughts appreciated....

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