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• When should we delete the cache data in an iPhone apps?

  - by athanhcong

  Hi all, We often cache image and data to improve our iPhone app's performance. But what strategy do you use to manage the cache data, such as delete or update it? When should we trigger to delete the cache data: when the iPhone apps starts, or quits, or in idle time?

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• Why do so many programmers consider Visual Basic a poor language? [closed]

  - by Mike

  Why do programmers consider Visual Basic a bad language? Putting aside any gripes with Microsoft or with proprietary/non-free software in general, and looking the language itself. Syntax, style, etc. I have just started using it, and find the syntax rather terrible. But I'm wondering what are the most common specific problems.

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• Are there any .net classes/functions that are optimized for multiple cores?

  - by diamandiev

  I know that the developer is supposed to do this himself. But seeing how we are getting cpu's with more and more cores and there are still many developers who do not use multithreading, if we have this functionality built in, it could increase performance dramatically in some scenarios. One particular example where this could be quite useful is in image processing. I doubt that the built in GDI+ classes are multithreaded.

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• Explain "Leader/Follower" Pattern

  - by Alex B

  I can't seem to find a good explanation of "Leader/Follower" pattern. All explanations either simply refer to it in the context of some problem, or are completely meaningless. Can anyone explain to the the mechanics of how this pattern works, and why and how it improves performance over more traditional asynchronous IO models? Examples and links to diagrams are appreciated too.

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• Ways to identify a particular exception from exception class

  - by Jibu P C_Adoor

  Hiii. Is there any way to uniquely identify a particular exception from the general exception class. i.e any property or method that retrieves a unique identifier that to identify a particular exception.

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• base-n series generator for a given number in java,,

  - by Senthil

  I want to create a program for generating the series for the given base-n. , for example if my input is 2,then series shuould be, 00,01,10,11,etc.,(binary) if my input is 10,then series shuould be,1,2,3,4,5,etc.,(decimal) is there any general mechanism to find these numbers so that I can program for base-n.,

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• C++: GUI libraries for embedding into an interpreter

  - by sub

  I've got my interpreter up and running - quite bug-free and stable for now - now I want to add some visual options to my language to play around. What is a good GUI library easy to use and mainly easy to embed and "link" to my programming language? What general rules do I have to follow? I'm currently on XP with Microsoft Visual Studio 2010.

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• Silverlight and Search Engines

  - by Ben

  Hi, I have recently started learning SilverLight (and Web developement in general) and have been advised by a friend that SilverLight isn't Search engine friendly (because Silverlight isn't HTML). Is there any way of getting around this and getting my site onto the Search engine lists (without paying)? (Any advise on getting my site on search engines lists would be greatly appreciated). Thanks

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• I'm trying to ressurrect UnderC C/C++ interpreter [closed]

  - by Domingo

  Hello ! I'm trying to ressurrect UnderC C/C++ interpreter https://code.google.com/p/underc-fltk/ and I got it to compile with modern mingw compilers 3.4.5 and up, I need some experts advice on some topics: -Yacc/Bison grammar (example some problems with recognizing "unsigned" alone and "friend class") -ARM assembler only one function to call native os functions (X86 already there for windows and linux) -General improvements I expect it to work on WINCE, IPHONE, SYMBIAN in the near future. Thanks in advance for your expertize, time and attention !

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• Can I call DbDataAdapter.Fill with a DbDataAdapter.SelectCommand that has a inner join to populate

  - by matti

  or do I have to use 2 separate DbDataAdapters with single-table Selects and then use DataRelations? like: SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo FROM Persons INNER JOIN Orders ON Persons.P_Id=Orders.P_Id ORDER BY Persons.LastName I can't yet try this. I'm designing a xml config file schema for a general program so it would help a lot! -cheers & BR: Matti

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• Finding contained bordered regions from Excel imports.

  - by dmaruca

  I am importing massive amounts of data from Excel that have various table layouts. I have good enough table detection routines and merge cell handling, but I am running into a problem when it comes to dealing with borders. Namely performance. The bordered regions in some of these files have meaning. Data Setup: I am importing directly from Office Open XML using VB6 and MSXML. The data is parsed from the XML into a dictionary of cell data. This wonks wonderfully and is just as fast as using docmd.transferspreadsheet in Access, but returns much better results. Each cell contains a pointer to a style element which contains a pointer to a border element that defines the visibility and weight of each border (this is how the data is structured inside OpenXML, also). Challenge: What I'm trying to do is find every region that is enclosed inside borders, and create a list of cells that are inside that region. What I have done: I initially created a BFS(breadth first search) fill routine to find these areas. This works wonderfully and fast for "normal" sized spreadsheets, but gets way too slow for imports into the thousands of rows. One problem is that a border in Excel could be stored in the cell you are checking or the opposing border in the adjacent cell. That's ok, I can consolidate that data on import to reduce the number of checks needed. One thing I thought about doing is to create a separate graph that outlines the cells using the borders as my edges and using a graph algorithm to find regions that way, but I'm having trouble figuring out how to implement the algorithm. I've used Dijkstra in the past and thought I could do similar with this. So I can span out using no endpoint to search the entire graph, and if I encounter a closed node I know that I just found an enclosed region, but how can I know if the route I've found is the optimal one? I guess I could flag that to run a separate check for the found closed node to the previous node ignoring that one edge. This could work, but wouldn't be much better performance wise on dense graphs. Can anyone else suggest a better method? Thanks for taking the time to read this.

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• Ubiquitous framework to target multiple smartphone OS?

  - by Fabian

  Is there already a ubiquitous/general framework to target multiple smartphone OS, i.e. like a QT for Android/iPhone/Symbian? Or would be technically too hard to write such a framework?

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• shell scripting arithmetic operations

  - by benjamin button

  in general i will use expr inside shell scripts for doing arithmetic operations. is there a way where we can come up with arithmetic operation in a shell script without using expr?

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• compare windows server for patch/update/hotfix installs

  - by user12002221

  Are there any tools that can be used to connect to windows 2008 servers, and get a comparison of the installed patches/updates on the servers, showing what is installed on one and not on the other? This is to help isolate an issue we are seeing on a specific windows server, in a load balanced setup. There is a certain performance/locking issue, which is mitigated whenever one of the servers is disabled. Please share, if you have any suggestions. Thanks in advance!

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• Can processor cores thrash each other's caches?

  - by Jørgen Fogh

  If more than one core on a processor is accessing the same memory address, will they thrash each other's caches or will some snooping protocol allow each to keep the data in L1-cache? I am interested in a general answer as well as answers for specific processors. How many layers of cache are invalidated? Will accessing another address within the same cache-line invalidate the entire line? What can you do to alleviate these problems?

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• Windows must have utilities [closed]

  - by Marcus

  What are your must have Windows utilities to help you with development? For me it's Unlocker This is about general Windows utilities, nothing specific to any language.

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• What are the benefits of using IronPython over IronRuby or F#?

  - by Aim Kai

  Well aware that DLR is here!! I have recently reading up on all of these and was wondering if there were any specific benefits of using one language over another? For example performance benefits! and available functionality through standard libaries!!

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• Is it best practice to try - catch my entire PHP code, or be as specific as possible?

  - by Itay Moav

  I do not have many kinds of Exceptions in my project. Right now,(we use MVC) I have the try catch encompassing my entire code: try{ fronController::dispatch($somthing...); }catch(Exception $E){ //handle errors } I wonder if there is a good reason to use the try-catch block in as specific as possible way as I can or just keep it general as it is now?

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• Is it reasonable to use OpenGL for desktop applications?

  - by JamesK89

  I've been writing a small desktop gadget-type application that displays scrolling text along the bottom of the screen (Similar to the old CNN news ticker), however the performance of GDI is just unsatisfactory (As high as 8-12% on a quad core and 20% on a single core) even after I've attempted to clean out bottlenecks. I was considering using OpenGL instead to render everything, but I don't know if that is a reasonable option to require users to have hardware acceleration for a tiny app like this. Does anybody have any input on this?

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• Can gems be used by ruby code compiled with macrubyc

  - by sal

  MacRuby 0.5 includes a ruby compiler built on LLVM called macrubyc. Does anyone know if it would be possible to dynamically load gems from compiled code? Or compile the gems and link them in? Is this planned? Or how compiled code will be able to make use of gems in general.

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• How do "modern JVMs" differ from older JVMs?

  - by Lord Torgamus

  Here's a phrase that I heard a lot throughout high school and university computer science classes: "That's not an issue for modern JVMs." Usually this would come up in discussions about overall performance or optimization strategies. It was always treated as a kind of magical final answer, though, as if it makes issues no longer worth thinking about. And that just leads me to wonder: what are the differences between the prototypical "modern JVM" and older JVMs, really?

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• Best free, online Python tutorials and references for an experienced programmer?

  - by Jacques Bosch

  I have been doing Java, and C# for many years. Starting on my first big Python program now. I have written a few, very small, text processing scripts in Python years ago. I would like to know what is the best, free, online Python tutorial for experienced programmers. Python in general, but then also web programming with Python. Will be using Django. Thanx much.

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• Select...Case VB.NET to C# Equivalent

  - by Alex Essilfie

  I just started using C# and I've got a couple of issues. I hook several controls to one event handler as in the following and I want to perform a slightly different action for each control: Private Sub Button_Click(sender as Object, e as EventArgs) _ Handles button1.Click, Button2.Click 'do a general activity Select CType(sender, Button).Name Case button1.Name 'do something Case button2.Name 'do something else Case Else 'do the defalut action End Select End Sub Is there any way of doing the above select statement in C# without having to use nested ifs?

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• Microsoft Fax Routing

  - by Gerard

  Hi All, I have a general question about MS Fax Routing service in Server 2008. Is it possible to have multiple extensions on the fax server. For example if the fax number is 90081000, can there be an extension for 1001, 1002 etc etc. Are we able to create these extension from within the MS Fax software and then route the different extensions to different email addresses? Thanks Regards g

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• Google App Engine - Does the non-main version of an App not receive as many resources?

  - by Spines

  I'm doing performance tests on my app engine app. I'm doing it on the non main version of my app. Do loading requests take longer for the non main version of an app?

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