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• Discussion of a Distributed Data Storage implementation

  - by fegol

  I want to implement a distributed data storage using a client/server architecture. Each data item will be stored persistently in disk in one of several remote servers. The client uses a library to update and query the data, shielding the client from its actual location. This should allow a client to associate keys (String) to values(byte[]), much as a Map does. The system must ensure that the amount of data stored in each server is approximately the same. The set of servers is known beforehand by other servers and clients. Both the client and the server will be written in Java, using sockets, threads, and files. I open this topic with the objective of discussing the best way to implement this idea, assuming simplicity, what are the issues of this implementation, performance measurements and discussion of the limitations.

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• Hack Fest Going Strong!

  - by Yolande Poirier

  Today was the first day of  the Hack Fest at Devoxx, the Java developer conference in Belgium.  The Hack Fest started with the Raspberry Pi & Leap Motion hands-on lab. Vinicius Senger introduced the Java Embedded, Arduino and Raspberry Pi. Java Champion Geert Bevin presented the Leap Motion, a controller sensing your hands and fingers to play games by controlling the mouse as an example. "Programmers are cooler than musicians because they can create entire universe using all senses" explained Geert In teams, participants started building applications using Raspberry Pi, sensors and relays. One team tested the performance of Tomcat, Java EE and Java Embedded Suite on the Raspberry Pi. Another used built an text animation using a LCD screen. Teams are using the Leap Motion to close and open programs on the desktop and other teams are using it as a game control. 

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• WMemoryProfiler is Released

  - by Alois Kraus

  What is it? WMemoryProfiler is a managed profiling Api to aid integration testing. This free library can get managed heap statistics and memory usage for your own process (remember testing) and other processes as well. The best thing is that it does work from .NET 2.0 up to .NET 4.5 in x86 and x64. To make it more interesting it can attach to any running .NET process. The reason why I do mention this is that commercial profilers do support this functionality only for their professional editions. An normally only since .NET 4.0 since the profiling API only since then does support attaching to a running process. This thing does differ in many aspects from “normal” profilers because while profiling yourself you can get all objects from all managed heaps back as an object array. If you ever wanted to change the state of an object which does only exist a method local in another thread you can get your hands on it now … Enough theory. Show me some code /// <summary> /// Show feature to not only get statisics out of a process but also the newly allocated /// instances since the last call to MarkCurrentObjects. /// GetNewObjects does return the newly allocated objects as object array /// </summary> static void InstanceTracking() { using (var dumper = new MemoryDumper()) // if you have problems use to see the debugger windows true,true)) { dumper.MarkCurrentObjects(); Allocate(); ILookup<Type, object> newObjects = dumper.GetNewObjects() .ToLookup( x => x.GetType() ); Console.WriteLine("New Strings:"); foreach (var newStr in newObjects[typeof(string)] ) { Console.WriteLine("Str: {0}", newStr); } } } … New Strings: Str: qqd Str: String data: Str: String data: 0 Str: String data: 1 … This is really hot stuff. Not only you can get heap statistics but you can directly examine the new objects and make queries upon them. When I do find more time I can reconstruct the object root graph from it from my own process. It this cool or what? You can also peek into the Finalization Queue to check if you did accidentally forget to dispose a whole bunch of objects … /// <summary> /// .NET 4.0 or above only. Get all finalizable objects which are ready for finalization and have no other object roots anymore. /// </summary> static void NotYetFinalizedObjects() { using (var dumper = new MemoryDumper()) { object[] finalizable = dumper.GetObjectsReadyForFinalization(); Console.WriteLine("Currently {0} objects of types {1} are ready for finalization. Consider disposing them before.", finalizable.Length, String.Join(",", finalizable.ToLookup( x=> x.GetType() ) .Select( x=> x.Key.Name)) ); } } How does it work? The W of WMemoryProfiler is a good hint. It does employ Windbg and SOS dll to do the heavy lifting and concentrates on an easy to use Api which does hide completely Windbg. If you do not want to see Windbg you will never see it. In my experience the most complex thing is actually to download Windbg from the Windows 8 Stanalone SDK. This is described in the Readme and the exception you are greeted with if it is missing in much greater detail. So I will not go into this here.   What Next? Depending on the feedback I do get I can imagine some features which might be useful as well Calculate first order GC Roots from the actual object graph Identify global statics in Types in object graph Support read out of finalization queue of .NET 2.0 as well. Support Memory Dump analysis (again a feature only supported by commercial profilers in their professional editions if it is supported at all) Deserialize objects from a memory dump into a live process back (this would need some more investigation but it is doable) The last item needs some explanation. Why on earth would you want to do that? The basic idea is to store in your live process some logging/tracing data which can become quite big but since it is never written to it is very fast to generate. When your process crashes with a memory dump you could transfer this data structure back into a live viewer which can then nicely display your program state at the point it did crash. This is an advanced trouble shooting technique I have not seen anywhere yet but it could be quite useful. You can have here a look at the current feature list of WMemoryProfiler with some examples.   How To Get Started? First I would download the released source package (it is tiny). And compile the complete project. Then you can compile the Example project (it has this name) and uncomment in the main method the scenario you want to check out. If you are greeted with an exception it is time to install the Windows 8 Standalone SDK which is described in great detail in the exception text. Thats it for the first round. I have seen something more limited in the Java world some years ago (now I cannot find the link anymore) but anyway. Now we have something much better.

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• How to set up an informational interview?

  - by Ethel Evans

  I've heard a lot about informational interviews, but don't have the slightest idea how to actually set one up or run one effectively. I work as an SDET (SDE in Test) in an area with lots of great technical companies, and would like to have a better understanding of how different companies do testing. I have three sub-questions: Who would I get in contact with to set up informational interviews at a company that I'd like to learn about? How can I make sure the time is productive? And, how do I keep the interview from being a burden to the employee(s) whom I speak with?

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• How to acheive a smoother lighting effect

  - by Cyral

  I'm making a tile based game in XNA So currently my lightning looks like this: How can I get it to look like this? Instead of each block having its own tint, it has a smooth overlay. I'm assuming some sort of shader, and to tell it the lighting and blur it some how. But im not an expert with shaders. My current lighting calculates the light, and then passes it to a spritebatch and draws with a color parameter EDIT: No longer uses spritebatch tint, I was testing and now pass parameters to set the light values. But still looking for a way to smooth it

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• Update drivers for TL-WN851ND

  - by Tony_GPR

  Today I bought a new PCI wireless card, TP-Link WN851ND, with Atheros AR9227 chipset. It has 2 antennas and is compatible with Wifi N so I thought it would improve the quality of the signal. But after install it on my computer the result is the opposite to expected. It doesn't connect to my network, while my old Wifi BG card connect without problems, I created an access point from my smartphone to try the card, and work, but is very slow loading pages. In Windows 7 works perfectly, so I think the problem is the driver. I have Ubuntu 12.04 LTS with kernel 3.2.0.31, is there a way to update the driver or I can apply a patch to improve the performance of the card? Otherwise, anyone know if there is a work in progress to improve compatibility with this chipset, or is it better to change the card and buy one with better driver compatibility. And finally, which wireless N compatible chipsets have good support under Linux/Ubuntu?

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• How to manage two video cards on a laptop (ATI and Intel)?

  - by Marc-François Cochaux-Laberge

  I have a laptop with two video cards. One ATI and on integrated Intel. On Windows, I can choose which video card I want to use. For example, I use the Intel card for normal use and for gaming, I switch to my ATI card for better performance, but a shorter battery life. In Ubuntu 10.10, only the Intel driver is installed, the ATI driver for my card doesn't work at all and there's heat coming out of my computer all the time, like when I'm playing video games on Windows. I think both cards are active, but only the Intel one is usefull. How can I solve this by making sure Ubuntu is aware of the two video cards and by disabling my ATI. Or may be I am all wrong about this?

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• Which one scales better asp or php?

  - by Marin

  Let's say the website is doing fine(forums,pictures,ajax). And it needs scaling up/scaling out. I feel more comfortable with php but I have worked with asp.net as well. Would you say asp.net is much more powerful, more robust and thus easier to scale out? What would be the pros and cons of converting the website to asp.net in regards to scalability and performance versus keeping the website written in PHP? Examples of personal experience in making such a conversion would be a plus. Thank you.

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• More Sessions At Central Coast Code Camp, Ruby/Cloud Computing

    Should Your Application Run In The Cloud Im back and sitting in Steve Evans Session, Should Your Application Run In The Cloud.  Hes now explaining how computers, since the stone age,... This site is a resource for asp.net web programming. It has examples by Peter Kellner of techniques for high performance programming...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Problems with NAT Adapater since upgrade to Ubuntu 12.10

  - by jjesse

  I was running Ubuntu 12.04 w/ VirtualBox installed. I was using the NAT interface to connect to everything. Basically running VBOX for testing some things and a Windows VM for Netflix.. Was back to working in my VMs today and noticed that I was unable to connect to the internet. In the VM settings I'm using the NAT adapter, however I noticed there is no NAT adapter in the Network Settings under Preferences in VBOX. Not quite sure what happened but wonder what is going on? I noticed there are some posts about changes DNSMASQ and configuring a bridge mode, but this worked out of the box under 12.04 and since the upgrade this no longers work. Need some help please

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• Desktop sharing options for Ubuntu 12.04 with Unity

  - by Stefan Buynov

  I would like to be able to access my office Ubuntu 12.04 machine from home, from a Mac Mini with Mac OSX. I have a VPN and I am able to access my office machine over SSH, so connectivity is not a problem. I browsed other questions, and it seems that there are several options: VNC XRDP FreeNX (haven't heard this one before) Are there any other? I have been using Remote Desktop on Windows before, and I actually like it. Not sure how well is XRDP implemented. I also used VNC several years back, and I didn't like its performance back then - not sure if things have changed since then. As I said above, the machine I want to access is running Ubuntu 12.04, with Unity. And I am using Unity by choice - I really like it and would like to continue using it :) The client computer is running Mac OSX (Snow Leopard). Based on your previous experience what is the best setup for this environment?

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• Penny auction concept and how the timer works

  - by madi

  I am creating a penny auction site using PHP yii framework. The main consideration of the system is to update the database records of all active auctions (max 15 auctions) with the current ticker timer. I am seeking for advice on how i should design the system where every auction item will have a its own countdown timer stored in the database and when someone bids the auction item, the counter resets to 2 min. Every users who are connected to the system should see the same countdown timer for that particular auction. I am little confused on how i should design the system. Will there be a performance issue when there are frequent updates to the database (Mysql) where 15 active auctions are updated every seconds, the countdown timer decreases by a second in the database table for the particular auction. Schema Sample for auction_lots: Auction_id,startdatetime,counter_timer,status I am seeking for advice on how I should design this. Please help. Thank you!

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• Upcoming Customer WebCast: SOA 11g Database: Guide for Administrators

  - by MariaSalzberger

  The SOA infrastructure database is used by SOA Suite products like BPEL PM, BAM, BPM, Human Worklow, B2B and Mediator. A SOA administrator is involved in many different tasks like installation, upgrade, performance tuning and other administrative topics. Another important one is purging - see the posting for this: SOA Suite 11g Purging Guide. We have implemented a guide to help with thess tasks: SOA 11g Infrastructure Database: Installation, Maintenance and Administration Guide. An upcoming advisor webcast planned for Wednesday, April 11 2012 at 15:00 UK / 16:00 CET / 07:00 am Pacific / 8:00 am Mountain / 10:00 am Eastern will walk you through the guide and show some of the highligts. Registration for this webcast is available in SOA 11g Database: Guide for Administrators [ID 1422913.1]. The presentation recording can by found here after the webcast. (https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&doctype=ANNOUNCEMENT&id=740964.1) The schedule for future webcasts can be found here (https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&doctype=ANNOUNCEMENT&id=740966.1)

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• Working out of a vertex array for destrucible objects

  - by bobobobo

  I have diamond-shaped polygonal bullets. There are lots of them on the screen. I did not want to create a vertex array for each, so I packed them into a single vertex array and they're all drawn at once. | bullet1.xyz | bullet1.rgb | bullet2.xyz | bullet2.rgb This is great for performance.. there is struct Bullet { vector<Vector3f*> verts ; // pointers into the vertex buffer } ; This works fine, the bullets can move and do collision detection, all while having their data in one place. Except when a bullet "dies" Then you have to clear a slot, and pack all the bullets towards the beginning of the array. Is this a good approach to handling lots of low poly objects? How else would you do it?

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• IP/PORT forward requests to another server

  - by DT.DTDG

  I have the following listening PORT:IP set up on my UBuntu server. 12.345.67.890:3636 It receives requests perfectly, however, I would now like to forward any requests to that IP:PORT to another IP:PORT, i.e.: 09.876.54.321:3636 Essentially I want to do a request forward 12.345.67.890:3636 -> 09.876.54.321:3636. How can I go about it in Terminal and if I wanted to change it back how can I go about that too? Is there also a way to test that the data is forwarding and it is setup properly? Thanks! Edit: Can I just do as follows, just wondering how I would go about testing it and how I could disable it? sysctl net.ipv4.ip_forward=1 iptables -t nat -A PREROUTING -p tcp --dport 3636 -j DNAT --to-destination 09.876.54.321:3636 iptables -t nat -A POSTROUTING -j MASQUERADE

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• SL: Silverlight 5

  - by xamlnotes

  Check out this new demo from MIX11. http://code.msdn.microsoft.com/silverlight/3D-Housebuilder-demo-from-def4af04 SL 5 is the next big step for great apps in SL. This new release is adding more features to an already great technology.  You can find out more about this release at http://www.microsoft.com/silverlight/future/ . I particularly like the new features for business applications such as the next text improvements and making the combo box type ahead right out of the box. Plus there are more enhancements for databinding too.  And the list goes on and on with features such as performance and “trusted application”. Where is Sl 5 now? its in Release Candidate now so the final bits should not be far down the road.

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• How to Disable Screen Auto-Rotation in Windows 8

  - by Taylor Gibb

  Windows 8 is strongly aimed at tablets, most of which allow use in both landscape and portrait orientations. Depending on your personal preference, you may wish to disable this auto-rotating behavior. Here’s how to do it. Note: While testing out devices we noticed that the setting to disable screen rotation isn’t available on all devices, so we have provided a way to disable it in the registry as well. How To Use USB Drives With the Nexus 7 and Other Android Devices Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It

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• How to reset setting of Wine, avoiding uninstalling all applications in it?

  - by cipricus

  Foobar2000 volume slider stopped working in Wine Sound is good but volume cannot be changed from the player's slider anymore. Is there a setting in Wine that might have entailed this? I have tested [Vineyard][1] (also) and then gave it up on which occasion some setting in Wine might have been altered but cannot see which. Edit: This affects the main installation (v.1.1.15) made in Wine, and also portable installations of the same version (as well as portable installations of v.1.1.14 and 1.1.17b that I tested) but does not affect older versions like 1.0.3. After testing more versions, it seems that the newest version without this problem is 1.1. (That is, before the version that changed the classic white-on-black Foobar2000 icon with the new white one.)

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• Asus 1215n GPU driver/s don't give me a "full" OS experience

  - by AFD

  I'm use to not having specific drivers from a manufacture on my laptop when running a Linux OS and that has always been fine - there's been adequate FOSS drivers for my needs and it hasn't ruined any of my OS experience. When I bought an Asus 1215n one of the upsides to the hardware seemed to be the switchable GPU that could give lots of performance or lots more battery life and would switch on-the-fly... with Windows of course. Seems that the Nvidia driver are crap and people advise not installing them. I have some sort of workaround for vga_switcharoo (?) and the on-the-fly nature of the GPUs has turned in to a manual one :( The worst bit though (aside from shorter battery life) is the web experience with HTML5. If I visit Mozilla's Web O'Wonder site I'm told I don't have WebGL working due to driver issues. This really blows - is it possible that proprietary drivers can now ruin my web experience too?!

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• Dynamically vs Statically typed languages studies

  - by Winston Ewert

  Do there exist studies done on the effectiveness of statically vs dynamically typed languages? In particular: Measurements of programmer productivity Defect Rate Also including the effects of whether or not unit testing is employed. I've seen lots of discussion of the merits of either side but I'm wondering whether anyone has done a study on it. Edit Sadly, only one of the papers shown is actually a study and it does nothing but conclude that the language matters. This leads me to ponder: what if I proposed doing such a study with volunteers from this site?

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• Alternative to Google Adsense which has good international coverage

  - by Yoga

  I have a technical blog (programming related) which has around 500 visit per days, 70% are international visitors and 30% are from US/CA. Google Adsense disabled my account due to invalid clicks so I can't use them (no need to explain here, they suck hard and never respect and listen to the publishers' appeal) I have tried adbrite and recently using chitika but they almost give me nothing, e.g. chitika 13,865 Page Views 4 clicks $0.01 The performance is so poor even I don't want to mention about it. I am already putting a full top banner and a 350x200 box in article body. I am researching if any alternative would provide more revenue for my internation visitors or technical visitors. Thanks.

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• Oracle NoSQL Database Using FusionIO ioDrive2

  - by Charles Lamb

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

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• Setting coding priorities

  - by dotnetdev

  Hi, In the dev shops I've worked in, nobody has ever mentioned "coding priorities". I read this in a book or site somewhere, and sets the expectation of what priority should be first in the code. In places where this is not specified, what should the first priority be? It may sound simple to say "do what the business need requires", but that could be at the expense of performance/maintainability. Many people say maintainability first, regardless, some say fulfill the need regardless. I am a young developer, so I am probably missing the point somewhere. Of course, programming is engineering and tough because you can never have the perfect solution. Thanks

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• Monday, 1st October: Presenting at JavaOne and Oracle Open World

  - by Darryl Gove

  On Monday 1 October I will be presenting at both JavaOne and Oracle Open World. The full conference schedule is available from here. The logistics for my sessions are as follows: JavaOne: 8:30am Monday 1 October. CON6714: "Mixed-Language Development: Leveraging Native Code from Java". San Francisco Hilton - Continental Ballroom 6 Oracle OpenWorld: 10:45am Monday 1 October. CON6382: "Maximizing Your SPARC T4 Oracle Solaris Application Performance". Marriott Marquis - Golden Gate C3 Hope to see you there!

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• In IE8, When File Download Completes, No Save Dialog Appears

  For quite some time now, when I download file using IE8, the file finishes downloading and there is no pop up that allows me to open the containing folder, or open the file itself.  Ive had to... This site is a resource for asp.net web programming. It has examples by Peter Kellner of techniques for high performance programming...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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