GC vs. Manual Memory Management Real World Comparison

[Benjamin Thaut]

I rewrote a 3d game I created during my studies with D 2.0 to manual 
memory mangement. If I'm not studying I'm working in the 3d Engine 
deparement of Havok. As I needed to pratice manual memory management and 
did want to get rid of the GC in D for quite some time, I did go through 
all this effort to create a GC free version of my game.

The results are:

     DMD GC Version: 71 FPS, 14.0 ms frametime
     GDC GC Version: 128.6 FPS, 7.72 ms frametime
     DMD MMM Version: 142.8 FPS, 7.02 ms frametime

GC collection times:

     DMD GC Version: 8.9 ms
     GDC GC Version: 4.1 ms

As you see the manual managed version is twice as fast as the garbage 
collected one. Even the highly optimized version created with GDC is 
still slower the the manual memory management.

You can find the full article at:

http://3d.benjamin-thaut.de/?p=20#more-20


Feedback is welcome.

Kind Regards
Benjamin Thaut