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  • Long overdue (for me) question about disposing managed objects in .Net, VB.Net, C#

    - by Jules
    I can't believe I'm still confused about this but, any way, lets finally nail it: I have a class that overrides OnPaint to do some drawing. To speed things up, I create the pens, brushes etc before hand, in the construtor, so that OnPaint does not need to keep creating and disposing them. Now, I make sure that I always dispose of such objects, but I have the feeling I don't need to because, despite the fact they implement IDisposable, they're managed objects. Is this correct?

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  • iphone cache strategy

    - by venkat
    hi all i am new to cache strategy....i would like to know how to increase the loading speed of web pages in iphone application... using cache strategy...its fine to have a response with sample code.... advance thanks. with kind regards venkat

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  • Caveats of select/poll vs. epoll reactors in Twisted

    - by David
    Everything I've read and experienced ( Tornado based apps ) leads me to believe that ePoll is a natural replacement for Select and Poll based networking, especially with Twisted. Which makes me paranoid, its pretty rare for a better technique or methodology not to come with a price. Reading a couple dozen comparisons between epoll and alternatives shows that epoll is clearly the champion for speed and scalability, specifically that it scales in a linear fashion which is fantastic. That said, what about processor and memory utilization, is epoll still the champ?

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  • How can I duplicate the UI functionality of Google Fastflip?

    - by marcamillion
    Trying to get the same functionality as Google FastFlip. Not just with the thumbnails, but even for the larger images too. Notice how when you click on a story, you see the main story front and center, and you see smaller half-screens of previous and next stories. How can I get that functionality? Is there a plugin for one of the JS frameworks that does this already? I also love the speed and feel of flipping through the images.

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  • Leverage browser caching

    - by Daniel
    I have a website and when I check page speed with Google plug-in, I receive: Leverage browser caching The following resources are missing a cache expiration Where can I change the settings for this?

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  • Recommendation for screen video capture for demos

    - by Simon
    I am just in the process of making some little demo tutorial videos for my app to help users get up to speed. I have used Camtasia in the past but don't really like it. Anyone have any recommendations. Good is more important than free, but free certainly helps. I can use Windows or Mac for this job.

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  • agility of asp.net MVC

    - by Hellnar
    Hello I am wondering how agile (fast to develop yet stable) asp.net MVC compared to frameworks using dynamic languages such as Django or Ruby on Rails. I will be happy if you share you experiance in the name of development speed (assuming each language/framework is known at a similar level) Things I love about Django Fast model design thanks to ORM Good template system Not too hard to deploy Easy to extend Lots of free apps to plugin and great documentation Thanks

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  • Python networkx DFS or BFS missing?

    - by sadawd
    Dear Everyone I am interested in finding a path (not necessarily shortest) in a short amount of time. Dijsktra and AStar in networkx is taking too long. Why is there no DFS or BFS in networkx? I plan to write my own DFS and BFS search (I am leaning more towards BFS because my graph is pretty deep). Is there anything that I can use in networkx's lib to speed me up? Thx

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  • Implement custom JTA XAResource for using with hibernate

    - by jstingo
    I have two level access to database: the first with Hibernate, the second with JDBC. The JDBC level work with nontransactional tables (I use MyISAM for speed). I want make both levels works within transaction. I read about JTA which can manage distributed transactions. But there is lack information in the internet about how to implement and use custom resource. Does any one have experience with using custom XAResources?

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  • Flex barChart and XML Data

    - by theband
    <Projectlist> <Project> <ProjectName>Alcoswitch - ToggleSwitches </ProjectName> <ProjectStatusname>Planning</ProjectStatusname> </Project> <Project> <ProjectName> Transverse Wedge</ProjectName> <ProjectStatusname>Canceled</ProjectStatusname> </Project> <Project> <ProjectName>High Speed Pluggable I/O</ProjectName> <ProjectStatusname>In-Progress</ProjectStatusname> </Project> <Project> <ProjectName>"High Speed Pluggable I/O - Product Breakouts:</ProjectName> <ProjectStatusname>In-Progress</ProjectStatusname> </Project> <Project> <ProjectName>Circular Plastic Connector (CPC)</ProjectName> <ProjectStatusname>In-Progress</ProjectStatusname> </Project> </Projectlist> This is my XML data i am recieving, how can i show this in a bar chart. <mx:BarChart id="barChart" showDataTips="true" dataProvider="{ProjectStateInfo}" width="100%" height="100%"> <mx:horizontalAxis> <mx:CategoryAxis categoryField="ProjectStatusname"/> </mx:horizontalAxis> <mx:verticalAxis> <mx:CategoryAxis categoryField="ProjectName"/> </mx:verticalAxis> <mx:series> <mx:BarSeries id="barSeries" visible="true" yField="ProjectName" xField="ProjectStatusname" displayName="ProjectStatusname" /> </mx:series> </mx:BarChart> My X-Axis shows muliple values of In-Progress, but i just need one. Is it possible to represent such relationship using BarChart. Any other Flex chart is Advisable.

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  • How to play YUV video in Qt4?

    - by shingle
    I want to play YUV video sequence by using Qt. Now I am using QPixmap, by using DrawPixel on QPixmap pixel by pixel. However, it can't play the video in real-time. How can I do to improve the speed?

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  • Any other kinds of "Task Queue" APIs ?

    - by sork
    I'm curious if it's common practice outside of the GAE platform to be able to defer tasks to background workers via webhooks. I find it particularly useful to speed up the front-end of webapps, by delegating any long process to background tasks. I'd like to hear about open source software allowing to implement a TaskQueue-like API, with webhooks preferably, if anyone has some experience in this area. Thanks!

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  • What is a columnar database?

    - by Raj More
    I have been working with warehousing for a while now. I am intrigued by Columnar Databases and the speed that they have to offer for data retrievals. I have multi-part question: How do Columnar Databases work? How do they differ from relational databases? Is there a trial version of a columnar database I can install to play around? (I am on Windows 7)

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  • Advice on logic circuits and serial communications

    - by Spencer Ruport
    As far as I understand the serial port so far, transferring data is done over pin 3. As shown here: There are two things that make me uncomfortable about this. The first is that it seems to imply that the two connected devices agree on a signal speed and the second is that even if they are configured to run at the same speed you run into possible synchronization issues... right? Such things can be handled I suppose but it seems like there must be a simpler method. What seems like a better approach to me would be to have one of the serial port pins send a pulse that indicates that the next bit is ready to be stored. So if we're hooking these pins up to a shift register we basically have: (some pulse pin)-clk, tx-d Is this a common practice? Is there some reason not to do this? EDIT Mike shouldn't have deleted his answer. This I2C (2 pin serial) approach seems fairly close to what I did. The serial port doesn't have a clock you're right nobugz but that's basically what I've done. See here: private void SendBytes(byte[] data) { int baudRate = 0; int byteToSend = 0; int bitToSend = 0; byte bitmask = 0; byte[] trigger = new byte[1]; trigger[0] = 0; SerialPort p; try { p = new SerialPort(cmbPorts.Text); } catch { return; } if (!int.TryParse(txtBaudRate.Text, out baudRate)) return; if (baudRate < 100) return; p.BaudRate = baudRate; for (int index = 0; index < data.Length * 8; index++) { byteToSend = (int)(index / 8); bitToSend = index - (byteToSend * 8); bitmask = (byte)System.Math.Pow(2, bitToSend); p.Open(); p.Parity = Parity.Space; p.RtsEnable = (byte)(data[byteToSend] & bitmask) > 0; s = p.BaseStream; s.WriteByte(trigger[0]); p.Close(); } } Before anyone tells me how ugly this is or how I'm destroying my transfer speeds my quick answer is I don't care about that. My point is this seems much much simpler than the method you described in your answer nobugz. And it wouldn't be as ugly if the .Net SerialPort class gave me more control over the pin signals. Are there other serial port APIs that do?

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  • Floating point vs integer calculations on modern hardware

    - by maxpenguin
    I am doing some performance critical work in C++, and we are currently using integer calculations for problems that are inherently floating point because "its faster". This causes a whole lot of annoying problems and adds a lot of annoying code. Now, I remember reading about how floating point calculations were so slow approximately circa the 386 days, where I believe (IIRC) that there was an optional co-proccessor. But surely nowadays with exponentially more complex and powerful CPUs it makes no difference in "speed" if doing floating point or integer calculation? Especially since the actual calculation time is tiny compared to something like causing a pipeline stall or fetching something from main memory? I know the correct answer is to benchmark on the target hardware, what would be a good way to test this? I wrote two tiny C++ programs and compared their run time with "time" on Linux, but the actual run time is too variable (doesn't help I am running on a virtual server). Short of spending my entire day running hundreds of benchmarks, making graphs etc. is there something I can do to get a reasonable test of the relative speed? Any ideas or thoughts? Am I completely wrong? The programs I used as follows, they are not identical by any means: #include <iostream> #include <cmath> #include <cstdlib> #include <time.h> int main( int argc, char** argv ) { int accum = 0; srand( time( NULL ) ); for( unsigned int i = 0; i < 100000000; ++i ) { accum += rand( ) % 365; } std::cout << accum << std::endl; return 0; } Program 2: #include <iostream> #include <cmath> #include <cstdlib> #include <time.h> int main( int argc, char** argv ) { float accum = 0; srand( time( NULL ) ); for( unsigned int i = 0; i < 100000000; ++i ) { accum += (float)( rand( ) % 365 ); } std::cout << accum << std::endl; return 0; } Thanks in advance!

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  • iPhone Frameworks

    - by Kevin
    What is a strong iPhone framework to start out developing with, besides the SDK from Apple? Are there any that exist to speed up development time?

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  • silverlight 4 net tcp binding security

    - by SLfan
    This document talks about how to send username and password from SL4 app to a web service. It assumes that HTTPS will be used for transport. However, I want to use NET TCP because of its speed. Is that possible because another article says net tcp in SL4 does not provide transport level security. If that's incorrect then how do I convert the https implementation to net tcp?

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