The Computer Language
Benchmarks Game

C++ g++ versus Python 3 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.

mandelbrot
source secs mem gz busy cpu load
C++ g++ 1.50 26,324 1791 5.97 100% 99% 99% 99%
Python 3 284.36 52,412 688 1,137.00 100% 100% 100% 100%
n-body
source secs mem gz busy cpu load
C++ g++ 8.18 1,112 1773 8.24 100% 0% 0% 1%
Python 3 774.34 7,844 1196 781.93 29% 0% 0% 72%
spectral-norm
source secs mem gz busy cpu load
C++ g++ 1.98 1,268 1044 7.89 100% 99% 99% 99%
Python 3 175.91 51,700 443 699.17 99% 99% 99% 99%
fasta
source secs mem gz busy cpu load
C++ g++ 1.33 1,824 2711 4.31 82% 82% 81% 80%
Python 3 63.10 682,516 1947 142.96 69% 62% 39% 57%
fannkuch-redux
source secs mem gz busy cpu load
C++ g++ 10.08 1,884 980 39.72 100% 100% 99% 95%
Python 3 477.00 49,972 950 1,887.27 100% 97% 100% 99%
binary-trees
source secs mem gz busy cpu load
C++ g++ 3.79 117,164 809 12.28 99% 76% 75% 74%
Python 3 81.03 451,324 589 288.46 95% 87% 86% 88%
k-nucleotide
source secs mem gz busy cpu load
C++ g++ 3.76 156,180 1624 11.55 97% 71% 71% 69%
Python 3 74.12 188,140 1967 280.38 94% 94% 93% 97%
reverse-complement
source secs mem gz busy cpu load
C++ g++ 1.55 996,188 1226 2.66 24% 25% 99% 23%
Python 3 18.59 1,007,292 814 24.35 22% 29% 59% 21%
regex-redux
source secs mem gz busy cpu load
C++ g++ 1.82 203,760 1315 4.43 44% 51% 48% 100%
Python 3 17.64 444,704 512 32.85 51% 80% 27% 28%
pidigits
source secs mem gz busy cpu load
C++ g++ 1.89 4,460 513 1.97 100% 2% 2% 1%
Python 3 3.47 10,140 386 3.52 0% 1% 100% 0%
C++ g++

g++ (Ubuntu 8.3.0-6ubuntu1) 8.3.0

Python 3

Python 3.7.3