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  • Threads slowing down application and not working properly

    - by Belgin
    I'm making a software renderer which does per-polygon rasterization using a floating point digital differential analyzer algorithm. My idea was to create two threads for rasterization and have them work like so: one thread draws each even scanline in a polygon and the other thread draws each odd scanline, and they both start working at the same time, but the main application waits for both of them to finish and then pauses them before continuing with other computations. As this is the first time I'm making a threaded application, I'm not sure if the following method for thread synchronization is correct: First of all, I use two global variables to control the two threads, if a global variable is set to 1, that means the thread can start working, otherwise it must not work. This is checked by the thread running an infinite loop and if it detects that the global variable has changed its value, it does its job and then sets the variable back to 0 again. The main program also uses an empty while to check when both variables become 0 after setting them to 1. Second, each thread is assigned a global structure which contains information about the triangle that is about to be rasterized. The structures are filled in by the main program before setting the global variables to 1. My dilemma is that, while this process works under some conditions, it slows down the program considerably, and also it fails to run properly when compiled for Release in Visual Studio, or when compiled with any sort of -O optimization with gcc (i.e. nothing on screen, even SEGFAULTs). The program isn't much faster by default without threads, which you can see for yourself by commenting out the #define THREADS directive, but if I apply optimizations, it becomes much faster (especially with gcc -Ofast -march=native). N.B. It might not compile with gcc because of fscanf_s calls, but you can replace those with the usual fscanf, if you wish to use gcc. Because there is a lot of code, too much for here or pastebin, I created a git repository where you can view it. My questions are: Why does adding these two threads slow down my application? Why doesn't it work when compiling for Release or with optimizations? Can I speed up the application with threads? If so, how? Thanks in advance.

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  • AJAX Web Application Development Explained

    This article talks about the revolutionary Ajax technology that is widely used for Web Application Development and its related advantages. The different applications of Ajax style Web Application Development are also described herein.

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  • APress Deal of the Day 12/Oct/2013 - Beginning Windows 8 Application Development – XAML Edition

    - by TATWORTH
    Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2013/10/12/apress-deal-of-the-day-12oct2013---beginning-windows-8.aspxToday's $10 deal of the day from APress at http://www.apress.com/9781430245667 is Beginning Windows 8 Application Development – XAML Edition "Beginning Windows 8 Application Development – XAML Edition shows you how to start building rich, immersive applications that connect people, applications, and devices with Windows 8."

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  • Custom Business Application Development in PHP - Features & Benefits

    A revolution is taking place within the business application arena today. Just a few years back most custom business applications such as CRM, ERP, data mining and other business data information systems were inflexible and expensive applications. The database ran on a server within the company's compounds and each desktop machine was running a client application.

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  • FIX: A dump file is not generated for a .NET Framework 2.0-based application after the application c

    981878 ... FIX: A dump file is not generated for a .NET Framework 2.0-based application after the application closesThis RSS feed provided by kbAlerz.com.Visit kbAlertz.com to subscribe. It's 100% free and you'll be able to recieve e-mail or RSS updates for the technologies you pick from the Microsoft Knowledge Base....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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  • A walkthrough to Application State

    This artcile discuss about the Application Level events,Application state with a simple example...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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  • Oracle Application Testing Suite 12.1 ??????????

    - by user773457
    Oracle Application Testing Suite 12.1 ??????????? http://japanmediacentre.oracle.com/content/detail.aspx?ReleaseID=1692???????????????? ?JD Edwards EnterpriseOne????????????????????????????????????? ?Oracle Application Testing Suite 12.1????????????????????????(IE9?Linux) ??????????????Oracle Enterprise Manager????????Oracle Cloud???????????????? ???????SQL?????????SELECT???????????????????????????? ??????????????????????????????????? ???? ATS-Tech ??????????

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  • Pinning Google Chrome's "Application Shortcuts" to the Windows 7 Taskbar

    - by Humphrey
    I love the idea behind Google Chromes Application Shortcuts, but they don't integrate well for me into the Windows 7 taskbar. Ideally, I'd like to be able to have my most used webpages (gmail, calendar, etc) as separate windows, pinned to the Windows 7 taskbar. I've created some application shortcuts on my desktop, but I've come across the following problems. If I open my gmail application shortcut, and then later on open a normal chrome window the new window will also use the gmail icon in the taskbar, even if that window has nothing to do with gmail. (What's weirder, is that this new window then uses a high-res gmail icon, but my actually application shortcut window uses a low-res icon. If I pin the application shortcut to the taskbar, then the icon turns into the regular chrome icon. Any idea's how to fix these issues? Or are they bugs in google chrome? Chrome version: 4.0.249.89

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  • Win2k8R2 / IIS 7.5 - users getting 503 response, no 503 error reported in logs

    - by merk
    I've got 2 web servers with mirrored content. There's a load balancer sitting in front of them. Starting yesterday we've been getting people complaining about 503 errors. i can't find any 503 errors in the IIS log file. However the server host is saying these errors are due to .Net errors in our website which are causing the app pool to recycle. They pointed out several errors in the windows application event log which look like this: Log Name: Application Source: ASP.NET 4.0.30319.0 Date: 3/31/2012 8:35:37 PM Event ID: 1309 Task Category: Web Event Level: Warning Keywords: Classic User: N/A Computer: 6251.local Description: Event code: 3005 Event message: An unhandled exception has occurred. Event time: 3/31/2012 8:35:37 PM Event time (UTC): 4/1/2012 1:35:37 AM Event ID: e7a580c7b38545cca3416a8595408f24 Event sequence: 97 Event occurrence: 1 Event detail code: 0 Application information: Application domain: /LM/W3SVC/2/ROOT-1-129777167518960645 Trust level: Full Application Virtual Path: / Application Path: C:\inetpub\wwwroot\mywebsite\ Machine name: 6252 Process information: Process ID: 20000 Process name: w3wp.exe Account name: IIS APPPOOL\MyAppPool In particular they are saying that the account name under Process Information indicates that the app pool is recycling. They said if the app pool were not recycle, the accountname would instead be the folder where the website files are located. I checked the app pool settings - it's set to recycle every 29 hours. And the rapid fail protection is set to the default of 5 failures in 5 minutes. But i have not seen 5 failures in the event log in that short of a time span. Can anyone help me confirm if the 503 responses are indeed being generated by the app pools recycling? Or are these errors coming from somewhere else? My guess at the time was their load balancer was the one actually returning the 503 error. But that was just a guess.

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  • Using Excel.Application in ASP where Excel is installed on Client Machines instead of the Server.

    - by simonalexander2005
    Hi, I have a server with an asp page on it that generates a report in Excel, using the Excel.Application object. Normally, Excel would have to be installed on the server to work. I was wondering, however, if it is possible to utilise the excel install on client machines to do this instead, as I can't install Excel on the server? Thanks for any help you can give

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  • Google Chrome Application Mode: Possible to isolate multiple instances?

    - by Jonathan Eunice
    I want to run multiple Google Chrome application windows logged into the same web site (Twitter.com, say), each with different credentials. Is this possible? If so, how? My initial testing shows that multiple Chrome app windows are not sufficiently isolated to do this. Logging into the second account logs me into the second account in both windows, suggesting that they are sharing information just as two Chrome tabs might.

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