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 1.73 308,544 2213 3.98 64% 76% 45% 45%
C++ g++ 1.82 203,760 1315 4.43 44% 51% 48% 100%
fasta
source secs mem gz busy cpu load
Haskell GHC 1.88 8,332 1998 4.80 64% 65% 64% 63%
C++ g++ 1.33 1,824 2711 4.31 82% 82% 81% 80%
fannkuch-redux
source secs mem gz busy cpu load
Haskell GHC 18.12 4,264 842 71.41 96% 100% 100% 99%
C++ g++ 10.08 1,884 980 39.72 100% 100% 99% 95%
spectral-norm
source secs mem gz busy cpu load
Haskell GHC 4.05 3,900 987 15.74 97% 97% 97% 98%
C++ g++ 1.98 1,268 1044 7.89 100% 99% 99% 99%
pidigits
source secs mem gz busy cpu load
Haskell GHC 4.20 10,248 379 5.32 86% 9% 8% 23%
C++ g++ 1.89 4,460 513 1.97 100% 2% 2% 1%
n-body
source secs mem gz busy cpu load
Haskell GHC 21.96 4,160 1883 86.83 98% 99% 98% 100%
C++ g++ 8.18 1,112 1773 8.24 100% 0% 0% 1%
binary-trees
source secs mem gz busy cpu load
Haskell GHC 13.52 493,528 592 50.12 92% 90% 92% 97%
C++ g++ 3.79 117,164 809 12.28 99% 76% 75% 74%
reverse-complement
source secs mem gz busy cpu load
Haskell GHC 5.93 501,548 1020 7.92 100% 12% 10% 12%
C++ g++ 1.55 996,188 1226 2.66 24% 25% 99% 23%
mandelbrot
source secs mem gz busy cpu load
Haskell GHC 11.60 37,756 782 46.30 100% 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 35.69 756,200 1486 126.21 88% 88% 87% 90%
C++ g++ 3.76 156,180 1624 11.55 97% 71% 71% 69%
Haskell GHC

The Glorious Glasgow Haskell Compilation System,
version 8.6.5

C++ g++

g++ (Ubuntu 8.3.0-6ubuntu1) 8.3.0