The Computer Language
Benchmarks Game

Python 3 versus Java 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.

pidigits
source secs mem gz busy cpu load
Python 3 3.47 10,356 386 3.53 1% 1% 0% 100%
Java 3.07 39,320 938 3.31 2% 5% 3% 98%
regex-redux
source secs mem gz busy cpu load
Python 3 18.45 457,340 512 37.52 69% 37% 50% 48%
Java 10.31 644,560 740 31.47 72% 72% 92% 70%
reverse-complement
source secs mem gz busy cpu load
Python 3 16.93 1,777,852 434 17.58 78% 21% 4% 0%
Java 3.16 712,368 2183 7.08 65% 47% 42% 70%
k-nucleotide
source secs mem gz busy cpu load
Python 3 72.24 199,856 1967 275.38 94% 94% 96% 96%
Java 9.33 447,976 1812 29.36 73% 83% 82% 77%
binary-trees
source secs mem gz busy cpu load
Python 3 80.30 448,004 589 286.50 95% 87% 87% 88%
Java 8.32 953,620 835 28.37 95% 87% 81% 77%
fasta
source secs mem gz busy cpu load
Python 3 63.55 844,180 1947 129.71 40% 71% 33% 61%
Java 2.22 45,172 2473 5.99 61% 50% 98% 60%
fannkuch-redux
source secs mem gz busy cpu load
Python 3 534.40 47,236 950 2,104.05 99% 97% 99% 99%
Java 14.33 34,888 1282 56.56 99% 98% 99% 98%
mandelbrot
source secs mem gz busy cpu load
Python 3 259.50 48,192 688 1,036.70 100% 100% 100% 100%
Java 6.83 79,108 796 26.86 97% 99% 99% 99%
n-body
source secs mem gz busy cpu load
Python 3 865.18 8,176 1196 874.96 2% 20% 79% 0%
Java 21.95 35,604 1429 22.75 2% 1% 100% 1%
spectral-norm
source secs mem gz busy cpu load
Python 3 169.87 49,188 417 675.02 100% 99% 99% 99%
Java 4.19 36,680 950 16.31 98% 97% 97% 98%
Python 3

Python 3.8.0

Java

openjdk 13 2019-09-17
OpenJDK Runtime Environment (build 13+33)
OpenJDK 64-Bit Server VM (build 13+33, mixed mode, sharing)