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++ 1.51 25,828 1791 6.03 100% 100% 100% 100%
Python 3 259.50 48,192 688 1,036.70 100% 100% 100% 100%
n-body
source secs mem gz busy cpu load
C++ g++ 7.70 1,792 1879 7.83 100% 0% 0% 1%
Python 3 865.18 8,176 1196 874.96 2% 20% 79% 0%
spectral-norm
source secs mem gz busy cpu load
C++ g++ 1.98 2,268 1044 7.89 100% 99% 99% 99%
Python 3 169.87 49,188 417 675.02 100% 99% 99% 99%
fannkuch-redux
source secs mem gz busy cpu load
C++ g++ 10.69 1,896 980 42.28 100% 100% 96% 100%
Python 3 534.40 47,236 950 2,104.05 99% 97% 99% 99%
fasta
source secs mem gz busy cpu load
C++ g++ 1.46 2,216 2711 4.40 75% 75% 76% 75%
Python 3 63.55 844,180 1947 129.71 40% 71% 33% 61%
binary-trees
source secs mem gz busy cpu load
C++ g++ 3.92 114,136 809 12.90 82% 75% 73% 98%
Python 3 80.30 448,004 589 286.50 95% 87% 87% 88%
k-nucleotide
source secs mem gz busy cpu load
C++ g++ 3.81 156,348 1624 11.78 70% 70% 73% 96%
Python 3 72.24 199,856 1967 275.38 94% 94% 96% 96%
regex-redux
source secs mem gz busy cpu load
C++ g++ 1.83 203,932 1315 4.44 44% 99% 48% 51%
Python 3 18.45 457,340 512 37.52 69% 37% 50% 48%
reverse-complement
source secs mem gz busy cpu load
C++ g++ 3.80 979,596 1087 4.95 11% 10% 29% 80%
Python 3 16.93 1,777,852 434 17.58 78% 21% 4% 0%
pidigits
source secs mem gz busy cpu load
C++ g++ 1.89 4,552 513 1.92 1% 100% 1% 0%
Python 3 3.47 10,356 386 3.53 1% 1% 0% 100%
C++ g++

g++ (Ubuntu 9.2.1-9ubuntu2) 9.2.1 20191008

Python 3

Python 3.8.0