Richards benchmark
This old post of mine is about virtual methods and devirtualizations:
http://leonardo-m.livejournal.com/76547.html

I have performed more benchmarks about virtual methods and its costs with LDC. I have used a little well known benchmark, the Richards one. I have used the code from here (on the Web Archive because it seems to be not online anymore):
http://web.archive.org/web/20060715074131/lissett.port5.com/ben/bench1.htm
http://web.archive.org/web/20060715074131/http://lissett.port5.com/ben/bench3.htm

All the code of the following benchmarks:
http://www.fantascienza.net/leonardo/js/richards.zip

Timing results:

Windows, n = 10_000_000:
  C:       1.26
  D ~C:    2.01
  Java:    2.04 (final classes, -server)
  D2 ~C#:  2.36 (final classes)
  D3 ~C#:  2.36 (final classes, no getters/setters)  
  Java:    2.73 (final classes)
  D4 ~C#:  3.07 (no getters/setters)  
  C#:      3.98
  D1 ~C#:  4.23
  
Windows, n = 100_000_000:
  C:      12.16
  Java:   18.73 (final classes, -server)
  D ~C:   18.86
  D2 ~C#: 23.11 (final classes)
  D3 ~C#: 23.12 (final classes, no getters/setters)  
  Java:   25.40 (final classes)
  D4 ~C#: 30.16 (no getters/setters)    
  C#:     38.39
  D1 ~C#: 41.64


Pubuntu, n = 10_000_000:
  D ~C:    1.35
  C:       1.39
  D2 ~C#:  1.98 (final classes)  
  D3 ~C#:  2.00 (final classes, no getters/setters) 
  Java:    2.73 (final classes)  
  D4 ~C#:  2.94 (no getters/setters)      
  C#:      -  
  D1 ~C#:  4.03
  
Pubuntu, n = 100_000_000:
  D ~C:   13.24
  C:      13.77
  D2 ~C#: 19.64 (final classes)
  D3 ~C#: 19.92 (final classes, no getters/setters) 
  Java:   25.16 (final classes)    
  D4 ~C#: 29.16 (no getters/setters)       
  C#:      -
  D1 ~C#:  40.17

Key:
  D ~C# means D code that comes from the C# version.
  D ~C means D code that comes and looks from the C version.

Note that the classes in C# code aren't final. As usual Java shows very good performance.


On WindowsXp:
DMD Digital Mars D Compiler v1.042
gcc version 4.3.3-dw2-tdm-1 (GCC)

dmd used with:
dmd -O -release -inline

ldc used with:
ldc -O5 -release -inline

gcc used with:
gcc -Wall -O3 -s -fomit-frame-pointer -msse3 -march=core2


On Pubuntu:
gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu4)
ldc based on DMD v1.045 and llvm 2.6svn (Thu Jul 2 23:07:48 2009)

ldc used with:
ldc -O5 -release -inline

gcc used with:
gcc -Wall -O3 -s -fomit-frame-pointer -msse3 -march=native