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• How anti-virus on the host machne affects performance of virtual machines?

  - by Ladislav Mrnka

  I'm diagnosing some issue with Oracle virtual box where virtual machine sometimes perform terribly slow (much slower then notebook with worse configuration): Notebook i7 (2 cores with HT = 4 logical CPUs), 4GB RAM, 5400 rpm disk, Win 7 64bit Virtual machine (Oracle Virtual Box) Host: i7 (4 cores with HT = 8 logical CPUs, 12 GB RAM, system runs from SSD, virtual machine from 7200 rpm disk, Win 7 64bit) Virtual machine: 4 cores assigned, 8 GB RAM assigned, Win 2008 R2 Enterprise (64 bit) Virtual machine uses bridge to separate network interface (machine has two) VPN for network communication No other virtual machine runs on the host Host has installed ESET Smart Security All SW is updated with last version. My question is if anti-virus on the host machine can somehow affect performance of the virtual machine and if so how can I turn it off without turning the anti-virus itself?

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• Testing performance from around the world - how do I get a linux shell easily in multiple countries?

  - by Matthew O'Riordan

  We are building a socket based service where latency is paramount, and as such we have servers distributed into 7 data centres around the world. However, whilst we know we're bringing the servers closer to the clients, it's very difficult to know how effective this is, and importantly, what difference this makes compared to our competitors. As such, we want to run simple scripts that test latency and throughput for both our service and our competitors, which is easy enough using Amazon, however Amazon only have 7 data centres. We would like to know for example how we perform in locations all over the world such as South Africa, Australia, China, Peru etc. Does anyone know of any service where we could piggy back off their global infrastructure and run some scripts to test this performance? The obvious contenders are people like Monitis, but I don't think they would allow us to run custom scripts, only standard protocol monitors. Thanks for your help. Matt

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• Does NTFS performance degrade significantly in volumes larger than five or six TB?

  - by Josh Yeager

  One of my customers is planning to set up a new document store, which will probably grow by 1-2TB per year. One of my co-workers says that Windows performance is extremely bad if it has a single NTFS volume that is bigger than five or six TB. He thinks that we need to set up their system with multiple volumes so that no single volume will exceed that limit. Is this a real problem? Does Windows or NTFS slow down when the volume size reaches several terabytes? Or is it possible to create a single volume of 10 or more TB?

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• Is there a MySQL performance benchmark to measure the impact of utf8_unicode_ci versus utf8_general_ci?

  - by MiniQuark

  I read here and there that using the utf8_unicode_ci collation ensures a better treatment of unicode text (for example, it knowns how to expand characters such as 'œ' into 'oe' for searching and ordering) compared to the default utf8_general_ci which basically just strips diacritics. Unfortunately, both sources indicate that utf8_unicode_ci is slightly slower than utf8_general_ci. So my question is: what does "slightly slower" mean? Has anyone run benchmarks? Are we talking about a -0.01% performance impact or rather something like -25%? Thanks for your help.

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• Are there localization tools which spot content strings in xaml/wpf?

  - by Noel Kennedy

  When globalizing a wpf application with static resx classes, it's very easy to miss the odd label or button that has its Content property set to a hard coded string in a particular language, ie English. These should of course be moved off to a {x:Static ...} so they can be localised for each culture. Are there any tools which can spot this and warn you? Built in to VS would be ideal, but I'm thinking that 'style cop' type build tools would do the job as well.

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• What tools do you use to share knowledge amongst developers in your company?

  - by Chris Ross

  I'm looking for some good tools that help to share tips, best practices, company standards, etc. amongs developers in my company. Two tools I'm currently considering are a wiki (screwturn wiki) or Sharepoint 2010. I'm wondering if there is something better suited to the task, or any input anyone has on this subject. I'd prefer something that's windows based (i.e. runs on IIS, can authenticate users against Active Directory etc) but I am open to anything.

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• How can I get a windows server to collate and email 4 daily reports/graphs for server performance

  - by Glyn Darkin

  I run a windows 2008 webserver and would like to setup the most basic performance monitoring in the world. What i would like is: a plot of ASP.Net request time for each w3wp process for a 24hour period a plot of CPU% utilisation for each w3wp process for a 24hour period a plot of Memory utilisation for each w3wp process for a 24hour period a plot of network utilisation for each w3wp process for a 24hour period a plot of disk utilisation for each w3wp process for a 24hour period I would these plots to be emailed to me each morning. Anybody know what is the simplest way to set this up? Thanks for your help in advance. Glyn

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• Performance problem with an Intel Wireless 5100

  - by Piet

  I just installed 12.04 on a HP Elitebook 2530p. The performance with wireless connection to an Eminem 4551 is very bad. Wired connection just works great. If I connect to my router (Eminent 4551) wired I have a good performance accessing internet pages with Firefox. When I try to access the same internet pages wireless I get a real bad performance. piet@piet-HP-EliteBook-2530p:~$ lspci 00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07) 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) 00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) 00:03.0 Communication controller: Intel Corporation Mobile 4 Series Chipset MEI Controller (rev 07) 00:03.2 IDE interface: Intel Corporation Mobile 4 Series Chipset PT IDER Controller (rev 07) 00:03.3 Serial controller: Intel Corporation Mobile 4 Series Chipset AMT SOL Redirection (rev 07) 00:19.0 Ethernet controller: Intel Corporation 82567LM Gigabit Network Connection (rev 03) 00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03) 00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03) 00:1a.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03) 00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03) 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03) 00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03) 00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03) 00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03) 00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03) 00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03) 00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03) 00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93) 00:1f.0 ISA bridge: Intel Corporation ICH9M-E LPC Interface Controller (rev 03) 00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode] (rev 03) 02:00.0 Network controller: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection 44:06.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05) 44:06.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22) piet@piet-HP-EliteBook-2530p:~$

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• SQL SERVER – SQL Server Performance: Indexing Basics – SQL in Sixty Seconds #006 – Video

  - by pinaldave

  A DBA’s role is critical, because a production environment has to run 24×7, hence maintenance, trouble shooting, and quick resolutions are the need of the hour.  The first baby step into any performance tuning exercise in SQL Server involves creating, analyzing, and maintaining indexes. Though we have learnt indexing concepts from our college days, indexing implementation inside SQL Server can vary.  Understanding this behavior and designing our applications appropriately will make sure the application is performed to its highest potential. Vinod Kumar and myself we often thought about this and realized that practical understanding of the indexes is very important. One can not master every single aspects of the index. However there are some minimum expertise one should gain if performance is one of the concern. More on Indexes: SQL Index SQL Performance I encourage you to submit your ideas for SQL in Sixty Seconds. We will try to accommodate as many as we can. Here is the interview of Vinod Kumar by myself. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Database, Pinal Dave, PostADay, SQL, SQL Authority, SQL in Sixty Seconds, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, SQLServer, T SQL, Video

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• Unexpected SQL Server 2008 Performance Tip: Avoid local variables in WHERE clause

  - by Jim Duffy

  Sometimes an application needs to have every last drop of performance it can get, others not so much. We’re in the process of converting some legacy Visual FoxPro data into SQL Server 2008 for an application and ran into a situation that required some performance tweaking. I figured the Making Microsoft SQL Server 2008 Fly session that Yavor Angelov (SQL Server Program Manager – Query Processing) presented at PDC 2009 last November would be a good place to start. I was right. One tip among the list of incredibly useful tips Yavor presented was “local variables are bad news for the Query Optimizer and they cause the Query Optimizer to guess”. What that means is you should be avoiding code like this in your stored procs even though it seems such an intuitively good idea. DECLARE @StartDate datetime SET @StartDate = '20091125' SELECT * FROM Orders WHERE OrderDate = @StartDate Instead you should be referencing the value directly in the WHERE clause so the Query Optimizer can create a better execution plan. SELECT * FROM Orders WHERE OrderDate = '20091125' My first thought about this one was we reference variables in the form of passed in parameters in WHERE clauses in many of our stored procs. Not to worry though because parameters ARE available to the Query Optimizer as it compiles the execution plan. I highly recommend checking out Yavor’s session for additional tips to help you squeeze every last drop of performance out of your queries. Have a day. :-|

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• Performance of concurrent software on multicore processors

  - by Giorgio

  Recently I have often read that, since the trend is to build processors with multiple cores, it will be increasingly important to have programming languages that support concurrent programming in order to better exploit the parallelism offered by these processors. In this respect, certain programming paradigms or models are considered well-suited for writing robust concurrent software: Functional programming languages, e.g. Haskell, Scala, etc. The actor model: Erlang, but also available for Scala / Java (Akka), C++ (Theron, Casablanca, ...), and other programming languages. My questions: What is the state of the art regarding the development of concurrent applications (e.g. using multi-threading) using the above languages / models? Is this area still being explored or are there well-established practices already? Will it be more complex to program applications with a higher level of concurrency, or is it just a matter of learning new paradigms and practices? How does the performance of highly concurrent software compare to the performance of more traditional software when executed on multiple core processors? For example, has anyone implemented a desktop application using C++ / Theron, or Java / Akka? Was there a boost in performance on a multiple core processor due to higher parallelism?

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• Configuration Tips for better Performance with ADF Mobile Apps

  - by SRINI INDLA

  Some tips to keep in mind to make sure ADF Mobile application's performance is optimal: 1. Select release mode in deployment profile. This is perhaps the most important thing to remember to ensure best performance for ADF Mobile Apps. Selecting this option causes the deployer to package optimized JVM and minified JS libs with the mobile app there by significantly improving the over all performance of the application. 2. For iOS you do not need to do anything else other than selecting  release mode in deploy profile. However, on Android you have to create a keystore and configure it in JDev --> Tools --> Preferences --> ADF Mobile --> Platforms : Android as shown in the snapshot below 3. Steps for generating the Keystore for Android using keytool :  4. Logging level setting in logging.properties: Make sure the log level is set to SEVERE for both framework logger as well as the application logger as follows oracle.adfmf.framework.level=SEVERE oracle.adfmf.application.level=SEVERE 5. When using SOAP WebServices with WebService Data Control make sure you select the option to copy the WSDL. This will cause the JDev to download the WSDL and all the XSDs referenced by the WSDL from the server at design time and package them with the application during deployment. This way the application does not incur the cost of downloading these resources at run time from the device.

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• Bad Performance With Games Under Wine in Ubuntu 12.04

  - by Pandem

  I'm somewhat new to Linux. I've dabbled with it before but never more than just experimentation in a VM or dual boot where I almost always reverted back to Windows soon after (more due to a lack of commitment than a dislike for the OS). Anyway my problem is that in the two games (Guild Wars and Team Fortress 2) I've tried so far I get fairly bad performance. Despite both games having a "Platinum" rating I've still been forced to run both in DirectX 8, otherwise they either crash, have texture defects or the UI is missing. By "bad performance" I mean sub-30 FPS where there are some players and regular large framerate drops with video settings on low. Currently in my mind I believe the performance issues are just a problem with the drivers because my graphics card is a AMD 7850 which is virtually brand new and probably not properly supported yet but I'm unsure and would appreciate advice or tips to improve things. I have Ubuntu 12.04 installed and I am usually logged in a Gnome Classic session. I have installed AMD's proprietary drivers (Catalyst version 12.4) and have Wine 1.4 installed. I have used Winetricks to install DX9/DX10 dlls and other things.

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• SQLAuthority News – Free Download – Microsoft SQL Server 2008 R2 RTM – Express with Management Tools

  - by pinaldave

  This blog post is in response to several inquiry about Free Download of SQL Server 2008 R2 RTM. Microsoft has announced SQL Server 2008 R2 as RTM (Release To Manufacture). Microsoft® SQL Server® 2008 R2 Express is a powerful and reliable data management system that delivers a rich set of features, data protection, and performance for embedded applications, lightweight Web Sites and applications, and local data stores. Download Microsoft SQL Server 2008 R2 RTM – Express with Management Tools. Download Microsoft SQL Server 2008 R2 RTM – Management Studio Express. Download SQL Server 2008 R2 Books Online. Reference : Pinal Dave (http://blog.SQLAuthority.com) Filed under: SQL, SQL Authority, SQL Download, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, T SQL, Technology

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• How to submit sitemap when your website has partial https? - Error: "Not in Domain"

  - by Ralph N

  My website is an ecommerce that is set up to do http for the item browsing portion, but https for things like shopping cart, contact us, etc.. (anything that has forms on it). I've submitted my website a long time ago to google webmaster tools as http://www.mywebsite.com. I also submitted a sitemap with about 40 links - 8 of them are https. I've noticed that for the longest time, google webmaster tools was reporting that 32 out of the 40 links have been crawled. I tested all the links against my robots.txt and realized that my robots text was blocking the https links. Google says those links are "Not In Domain". Is there a way i'm supposed to get around this so that I can have a hybrid-ssl site? I understand the concept that one site is mywebsite.com:80 and the other is mywebsite.com:443, but i'd like to avoid submitting and maintaining 2 seperate websites on google webmaster tools.

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• How to Use Firefox’s Web Developer Tools to View Website Structures in 3D

  - by Chris Hoffman

  Firefox 11 added two new web developer tools to Firefox’s already impressive arsenal. The Tilt feature visualizes website structures in 3D, while the Style Editor can edit CSS stylesheets on the fly. The 3D feature, known as Tilt, is a way of visualizing a website’s DOM. It integrates with the existing Document Inspector and uses WebGL to display rich 3D graphics in your browser. Make Your Own Windows 8 Start Button with Zero Memory Usage Reader Request: How To Repair Blurry Photos HTG Explains: What Can You Find in an Email Header?

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• Oracle ZFSSA Hybrid Storage Pool Demo

  - by Darius Zanganeh

  The ZFS Hybrid Storage Pool (HSP) has been around since the ZFSSA first launched.  It is one of the main contributors to the high performance we see on the Oracle ZFSSA both in benchmarks as well as many production environments.  Below is a short video I made to show at a high level just how impactful this HSP pool is on storage performance.  We squeeze a ton of performance out of our drives with our unique use of cache, write optimized ssd and read optimized ssd.  Many have written and blogged about this technology, here it is in action. Demo of the Oracle ZFSSA Hybrid Storage Pool and how it speeds up workloads.

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• "Optimal" game loop for 2D side-scroller

  - by MrDatabase

  Is it possible to describe an "optimal" (in terms of performance) layout for a 2D side-scroller's game loop? In this context the "game loop" takes user input, updates the states of game objects and draws the game objects. For example having a GameObject base class with a deep inheritance hierarchy could be good for maintenance... you can do something like the following: foreach(GameObject g in gameObjects) g.update(); However I think this approach can create performance issues. On the other hand all game objects' data and functions could be global. Which would be a maintenance headache but might be closer to an optimally performing game loop. Any thoughts? I'm interested in practical applications of near optimal game loop structure... even if I get a maintenance headache in exchange for great performance.

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• Will Check Constraints Improve Database Performance?

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• Software Management Tools for Agile Process Development

  - by Graviton

  We would like to implement the Agile/ Scrum process in our daily software management, so as to provide better progress visibility and feature managements, here are some of the activities that we want to do: Daily stand-up Release cycles of 6 weeks with 3 2-week iterations. Having a product back-log of tasks (integrate with bugzilla) and bugs estimated out. Printing a daily burn down to make velocity visible. When used as motivator, it's great. Easy feature development tracking and full blown visibility, especially for the sales and stake holders ( this means that it must be a web based tool). My team is distributed, so physical whiteboards aren't feasible. Is there such a web based tool that meets our needs? I heard icescrum may be one, but I've never used it so I don't know. There are a few more suggestions as here, but I've never heard of them, anyone cares to elaborate or suggest new tools?

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• Installing the Windows Azure Tools for Visual Studio March 2011 and SDK 1.4

  - by Enrique Lima

  Coming from the joys and new features the SDK 1.3 version gave us back in November/December, we are now again at the doors of another update, Version 1.4 To get it, go to the Windows Azure website, the click on the Develop Menu option.  Once there, Click on the Get Tools & SDK button. This will start the download to activate the Web Platform Installer, when you review the information on it, you get this. Click Install. And Accept the EULA. Installation starts at this point. And you are finished. More to come on the changes this addresses.

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• Chrome Web Store verification

  - by Vince V.

  A couple of days ago I created an extension for Chrome and added it to the store. Now I want it to get verified. I payed the 5 dollar and added my website to Webmaster Tools. The website is also verified on those Webmaster Tools. Today I wanted to add my URL to my extension (ultimately to do online installations) but it doesn't recognize the URL I put in those Webmaster Tools. I tried refreshing and clicking add site, but it just doesn't work. Is there some step that I am missing or is this a bug in the Chrome Web Store, because I don't see any option left.

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• Architecture of interaction modes ("paint tools") for a 3D paint program

  - by Bernhard Kausler

  We are developing a Qt-based application to navigate through and paint on a volume treated as a 3D pixel graphic. The layout of the app consists of three orthogonal slice views on which the user may paint stuff like dots, circles etc. and also erase already painted pixels. Think of a 3D Gimp or MS Paint. How would you design the the architecture for the different interaction modes (i.e. paint tools)? My idea is: use the MVC pattern have a separate controler for every interaction mode install an event filter on all three slice views to collect all incoming user interaction events (mouse, keyboard) redirect the events to the currently active interaction controler I would appreciate critical comments on that idea.

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• How to Get Pro Features in Windows Home Versions with Third Party Tools

  - by Chris Hoffman

  Some of the most powerful Windows features are only available in Professional or Enterprise editions of Windows. However, you don’t have to upgrade to Windows Professional to use these powerful features – use these free alternatives instead. These features include the ability to access your desktop remotely, encrypt your hard drive, run Windows XP in a window, change advanced settings in group policy, use Windows Media Center, run an operating system off a USB stick, and more. How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using? HTG Explains: What The Windows Event Viewer Is and How You Can Use It

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• Windows Azure Tools for Microsoft Visual Studio 1.2 (June 2010)

  - by Eric Nelson

  Yey – we have a public release of the Windows Azure Tools which fully supports Visual Studio 2010 RTM and the .NET 4 Framework. And the biggy I have been waiting for – IntelliTrace support to debug your cloud deployed services (Requires  VS2010 Ultimate) Download today http://bit.ly/azuretoolsjune New for version 1.2: Visual Studio 2010 RTM Support: Full support for Visual Studio 2010 RTM. .NET 4 support: Choose to build services targeting either the .NET 3.5 or .NET 4 framework. Cloud storage explorer: Displays a read-only view of Windows Azure tables and blob containers through Server Explorer. Integrated deployment: Deploy services directly from Visual Studio by selecting ‘Publish’ from Solution Explorer. Service monitoring: Keep track of the state of your services through the ‘compute’ node in Server Explorer. IntelliTrace support for services running in the cloud: Adds support for debugging services in the cloud by using the Visual Studio 2010 IntelliTrace feature. This is enabled by using the deployment feature, and logs are retrieved through Server Explorer. Related Links: http://ukazure.ning.com for UK fans of Windows Azure IntelliTrace explained

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