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Optimization techniques himuskanhere5-Jul-07 1:39 himuskanhere 5-Jul-07 1:39  hey frnd... What optimization techniques should I use to improve the performance in SDi application. thnks... Re: Optimization techniques CPallini5-Jul-07 1:57 CPallini 5-Jul-07 1:57  It really depends on the kind of application your need to develop (i.e. the question is too generic). BTW first think about reliability and then about optimization. If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile. Re: Optimization techniques KarstenK5-Jul-07 2:54 KarstenK 5-Jul-07 2:54  As another poster wrote stability is the best optimization. It makes live of a programmer easy. To improve performance you gotta check, whether your program does somethings often. Try to reduce multiple thinks like creating brush or Api-Calls. Better make these values class members or globals. Check loops carefully!!! Greetings from Germany Re: Optimization techniques led mike5-Jul-07 4:44 led mike 5-Jul-07 4:44  Use a profiler to show you "where" to optimize. Re: Optimization techniques Joan M5-Jul-07 7:14 Joan M 5-Jul-07 7:14  Hello, Could you please recommend some of them? Thank you. Re: Optimization techniques led mike5-Jul-07 7:28 led mike 5-Jul-07 7:28  Not very well I apologize. It has been years since I have worked on a serious server project. Back then we used one from Intel and another from those guys that did Bounds Checker. I have no current knowledge of the Profiler landscape, we are just using the Visual Studio one because we have it and we rarely use it. We don't want to be hampered by running Profilers because we are an "Agile" operation. Re: Optimization techniques #realJSOP5-Jul-07 7:12 #realJSOP 5-Jul-07 7:12  Do not optimize the code. That's just another way to break the code. "Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997 ----- "...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001 Re: Optimization techniques Joe Woodbury5-Jul-07 10:02 Joe Woodbury 5-Jul-07 10:02  Remember that 90% of bottlenecks are in 10% of the code. Using straight forward C/C++ is actually the best common place optimization since it allows the compiler to do the work. Aside from that, you should get a profile and identify where the bottlenecks are. In some cases, like with hardware access, you can do nothing about performance except upgrade the hardware. In places where you can optimize, I've found that parsing code is a common place to look. Code that uses many small allocations is also a big killer (and problematic in other ways.) My favorite profile is DevPartner (http://www.compuware.com/products/devpartner/visualc.htm[^]) though it gotten rather expensive as of late. Added: Building on what John Simmons says--do not optimize code, optimize algorithms. (In other words, no matter how much you try to optimize a bad algorithm, it's still a bad algorithm.) Anyone who thinks he has a better idea of what's good for people than people do is a swine. - P.J. O'Rourke Re: Optimization techniques kakan5-Jul-07 19:43 kakan 5-Jul-07 19:43  I come to think of one speed optimisation from my own experience: Avoid all kinds of (xxx)printf at all cost! Of course including CString.Format, and other functions that use some kind of (xxx)printf. I once reduced the processing time (for 1000000 iterations) in a loop from 12 seconds to just below 4, simply by replacing one single sprintf() with a number of itoa(), strcat() and similar functions. Alcohol. The cause of, and the solution to, all of life's problems - Homer Simpson Re: Optimization techniques DevMentor.org8-Jul-07 23:51 DevMentor.org 8-Jul-07 23:51  Ah memories, I had the exact same experience, also a string object was getting created and initialized to a hard coded value, that was expensive Usually from my experience the bottleneck problems are in the design! Also you don't want to create / destroy / initialize a lot of things. If you can cache them or create them once and reuse them that is more ideal. Of course you may still need to reset state variables =) but the cost of creating and destroying an object will have been negated! If you're optimizing someone else existing code, expect to break it and introduce subtle bugs with the above idea. Chances are you are going to fail to account for properly resetting state variables before reusing one or more object / data structure. Re: Optimization techniques himuskanhere19-Jul-07 20:32 himuskanhere 19-Jul-07 20:32  ? Re: Optimization techniques DevMentor.org19-Jul-07 21:28 DevMentor.org 19-Jul-07 21:28  !!! Yours Truly, The One and Only! What is Data Execution Prevention? Amar Sutar5-Jul-07 1:13 Amar Sutar 5-Jul-07 1:13  What is DEP and how to write DEP compatible program? Amar. Re: What is Data Execution Prevention? Chris Losinger5-Jul-07 1:22 Chris Losinger 5-Jul-07 1:22  Amar Sutar wrote: how to write DEP compatible program? don't try to execute the sections of memory where your data lives. http://en.wikipedia.org/wiki/Data_Execution_Prevention image processing toolkits | batch image processing | blogging How to set CDialog's minimum size? Peter, Chan5-Jul-07 0:37 Peter, Chan 5-Jul-07 0:37  I have a form which is inherited from CDialog.It can be resizing. Now I want to set its minimum size (300, 200). It couldn't be smaller than (300, 200). How to do it with MFC 6.0. Thanks in advance. Re: How to set CDialog's minimum size? Nibu babu thomas5-Jul-07 0:42 Nibu babu thomas 5-Jul-07 0:42  Add a message map entry for WM_GETMINMAXINFO and override ... afx_msg void OnGetMinMaxInfo( MINMAXINFO FAR* lpMMI ); //Now fill out lpMMI->ptMinTrackSize like this... lpMMI->ptMinTrackSize.x = 300 lpMMI->ptMinTrackSize.y = 200; Nibu thomas A Developer Code must be written to be read, not by the compiler, but by another human being. http:\\nibuthomas.wordpress.com Re: How to set CDialog's minimum size? Iain Clarke, Warrior Programmer5-Jul-07 0:45 Iain Clarke, Warrior Programmer 5-Jul-07 0:45  Off the top of my head, you should be able to do it by handling WM_GETMINMAXINFO / CWnd::OnGetMinMaxInfo. Iain. Throw sanjutvm4-Jul-07 23:58 sanjutvm 4-Jul-07 23:58  Hi, My application has dependency with lib files. For db access and other related things there is one lib. I'm trying to use a retry logic when db connection fails. The retry logic is implemented in the application. When a CDBException occurs, it is propagated using throw. In some functions there is AfxThrowDBException. The problem is in some functions the exception pointer is deleted. For eg: catch(CDBException* e) {e->Delete();} So when the throw is propagated, and in the next(need not be immediate outer) catch block if again e is used, i'm getting unhandled exception. Should I check all the CDBException and remove e? Or is there any other alternative for this? Thanks and Regards, sanju. Re: Throw toxcct5-Jul-07 0:10 toxcct 5-Jul-07 0:10  why throwing a pointer rather than a reference ? [VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines] Re: Throw tom groezer5-Jul-07 5:25 tom groezer 5-Jul-07 5:25  What is the advantage of using a reference? Re: Throw toxcct5-Jul-07 5:35 toxcct 5-Jul-07 5:35  no need for delete dude !! [VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines] Re: Throw Mark Salsbery5-Jul-07 8:13 Mark Salsbery 5-Jul-07 8:13  Are you talking about rethrowing a reference to the CDBException pointer or throwing an object reference? If throwing an object reference to an object that isn't static - can the object go out of scope before the exception is caught? Mark Mark Salsbery Microsoft MVP - Visual C++ "Go that way, really fast. If something gets in your way, turn." Re: Throw toxcct5-Jul-07 21:20 toxcct 5-Jul-07 21:20  check what i'm doing in my VisualCalc Parser[^]... full of exceptions references. and it works perfectly well... [VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines] Re: Throw Mark Salsbery5-Jul-07 8:11 Mark Salsbery 5-Jul-07 8:11  How are you catching the exception in more than one place? If you're rethrowing it then you shouldn't delete it before doing so. Only the final handler should delete the object. Unless I'm missing something... Mark Mark Salsbery Microsoft MVP - Visual C++ "Go that way, really fast. If something gets in your way, turn." Re: Throw DevMentor.org9-Jul-07 0:02 DevMentor.org 9-Jul-07 0:02  My exact thoughts .. for all piratical purposes the exception has been handed inside the catch block and the propagation stops there! What remains is how the code execute after this point! Also as someone said, it's better to throw the object on the stack rather than on the heap and have to deleted it after!

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