Hello gd people,
i had my c++/opengl project running fine on CodeBlocks (with MINGW compiler). The debugger but was not so handly so i decided to move all the code in VS2010 Express edition.
The code is for the 99.9% the same. The 0.1% difference comes from stuff that compiles on CB and not in VS and i had to change.
My program is a win32 project. In the strarting it has to do lot of calcs because it has to build a mesh representing an image. The mesh is a complex object containing members like stl Vectors of pointers to vertices, edges, faces etc...
Why the hell when i run the program in VS it takes much longer respect to CB? Of course i run everything in release. Once the mesh is builded i cant notice any different in performance.
But at the start, before the first image appears in the drawning window, we speak of 1-2 seconds in CB versus 10-15 seconds in VS.
Might be express edition the problem?
Thanks fellows!
Riziero
Performance with different compilers
By default, MSVC generates debug-safety code for STL containers (even in release builds), which makes iterating over them (and other operations) excessively slow.
In your projects properties, you want to add the definitions:
[font="'Courier New"]_SCL_SECURE_NO_WARNINGS[/font]
[font="'Courier New"]_SECURE_SCL=0[/font]
In your projects properties, you want to add the definitions:
[font="'Courier New"]_SCL_SECURE_NO_WARNINGS[/font]
[font="'Courier New"]_SECURE_SCL=0[/font]
Are you running a debug or release build when you measure those times?
He did say he's running in Release when measuring the times.
I would go with Hodgmans suggestion.
Author
[quote name='BitMaster' timestamp='1309950516' post='4831721']
Are you running a debug or release build when you measure those times?
He did say he's running in Release when measuring the times.
I would go with Hodgmans suggestion.
[/quote]
Thanks for fast reply.
I will try when i am back to homeand let you khnow
Thats pretty wierd. Without even adding that setting, my speed in VC2010 is about 3x codeblocks when both are in the default release modes
By default, MSVC generates debug-safety code for STL containers (even in release builds), which makes iterating over them (and other operations) excessively slow.
In your projects properties, you want to add the definitions:
[font="'Courier New"]_SCL_SECURE_NO_WARNINGS[/font]
[font="'Courier New"]_SECURE_SCL=0[/font]
Actually, that only applies to MSVC 2005 and 2008. In MSVC 2010 _SECURE_SCL is disabled by default in release builds. Also, _SCL_SECURE_NO_WARNINGS has no performance impact.
Try running your program through a profiler (such as AMD's CodeAnalyst) to get a better look under the hood.
How are you running your app? If from within the IDE make sure you use CTRL-F5 (start without debugging) as opposed to just F5 (Debug).
By default, MSVC generates debug-safety code for STL containers (even in release builds), which makes iterating over them (and other operations) excessively slow.
In your projects properties, you want to add the definitions:
[font="Courier New"]_SCL_SECURE_NO_WARNINGS[/font]
[font="Courier New"]_SECURE_SCL=0[/font]
How do you do this? Under which section?
This topic is closed to new replies.
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