The Computer Language
Benchmarks Game

Haskell GHC versus C++ g++ fastest programs

Back in April 2010, Russ Cox charitably suggested that only fannkuch-redux, fasta, k-nucleotide, mandlebrot, nbody, reverse-complement and spectral-norm were close to fair comparisons. As someone who implemented programming languages, his interest was "measuring the quality of the generated code when both compilers are presented with what amounts to the same program."

Differences in approach - to memory management, parallel programming, regex, arbitrary precision arithmetic, implementation technique - don't fit in that kind-of fair comparison — but we still have to deal with them.

These are only the fastest programs. There may be additional measurements for programs which seem more-like a fair comparison to you. Always look at the source code.

regex-redux
source secs mem gz busy cpu load
Haskell GHC 1.72 307,968 2213 3.77 78% 40% 61% 40%
C++ g++ 1.82 203,760 1315 4.43 44% 51% 48% 100%
fasta
source secs mem gz busy cpu load
Haskell GHC 1.43 7,900 1882 4.25 76% 76% 73% 73%
C++ g++ 1.33 1,824 2711 4.31 82% 82% 81% 80%
fannkuch-redux
source secs mem gz busy cpu load
Haskell GHC 18.37 4,296 842 72.64 100% 100% 96% 100%
C++ g++ 10.08 1,884 980 39.72 100% 100% 99% 95%
spectral-norm
source secs mem gz busy cpu load
Haskell GHC 4.08 4,060 987 15.82 97% 97% 97% 97%
C++ g++ 1.98 1,268 1044 7.89 100% 99% 99% 99%
pidigits
source secs mem gz busy cpu load
Haskell GHC 4.21 9,296 379 5.24 9% 100% 8% 8%
C++ g++ 1.89 4,460 513 1.97 100% 2% 2% 1%
n-body
source secs mem gz busy cpu load
Haskell GHC 21.87 4,232 1883 86.49 100% 99% 98% 99%
C++ g++ 8.18 1,112 1773 8.24 100% 0% 0% 1%
binary-trees
source secs mem gz busy cpu load
Haskell GHC 13.34 466,176 592 49.53 95% 93% 92% 91%
C++ g++ 3.79 117,164 809 12.28 99% 76% 75% 74%
reverse-complement
source secs mem gz busy cpu load
Haskell GHC 6.28 501,496 1020 8.42 11% 11% 11% 100%
C++ g++ 1.55 996,188 1226 2.66 24% 25% 99% 23%
mandelbrot
source secs mem gz busy cpu load
Haskell GHC 11.65 39,512 782 46.54 100% 100% 100% 100%
C++ g++ 1.50 26,324 1791 5.97 100% 99% 99% 99%
k-nucleotide
source secs mem gz busy cpu load
Haskell GHC 37.65 756,564 1486 132.24 87% 86% 87% 91%
C++ g++ 3.76 156,180 1624 11.55 97% 71% 71% 69%
Haskell GHC

The Glorious Glasgow Haskell Compilation System,
version 8.8.1

C++ g++

g++ (Ubuntu 8.3.0-6ubuntu1) 8.3.0