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 10,140 386 3.52 0% 1% 100% 0%
Java 3.07 39,680 938 3.30 99% 3% 0% 5%
regex-redux
source secs mem gz busy cpu load
Python 3 17.64 444,704 512 32.85 51% 80% 27% 28%
Java 10.48 645,680 740 31.62 72% 87% 74% 68%
reverse-complement
source secs mem gz busy cpu load
Python 3 18.59 1,007,292 814 24.35 22% 29% 59% 21%
Java 3.27 740,524 2183 7.44 44% 57% 84% 43%
k-nucleotide
source secs mem gz busy cpu load
Python 3 74.12 188,140 1967 280.38 94% 94% 93% 97%
Java 8.70 446,004 1812 27.18 83% 78% 78% 73%
binary-trees
source secs mem gz busy cpu load
Python 3 81.03 451,324 589 288.46 95% 87% 86% 88%
Java 8.28 907,060 835 27.59 86% 90% 80% 77%
fannkuch-redux
source secs mem gz busy cpu load
Python 3 477.00 49,972 950 1,887.27 100% 97% 100% 99%
Java 17.04 34,236 1282 67.30 99% 98% 100% 98%
fasta
source secs mem gz busy cpu load
Python 3 63.10 682,516 1947 142.96 69% 62% 39% 57%
Java 2.23 45,156 2473 5.99 51% 62% 59% 97%
n-body
source secs mem gz busy cpu load
Python 3 774.34 7,844 1196 781.93 29% 0% 0% 72%
Java 21.94 35,588 1429 22.39 100% 0% 1% 1%
spectral-norm
source secs mem gz busy cpu load
Python 3 175.91 51,700 443 699.17 99% 99% 99% 99%
Java 4.19 36,740 950 16.36 98% 97% 98% 98%
mandelbrot
source secs mem gz busy cpu load
Python 3 284.36 52,412 688 1,137.00 100% 100% 100% 100%
Java 5.98 79,184 796 23.43 98% 98% 97% 99%
Python 3

Python 3.7.3

Java

openjdk 12 2019-03-19
OpenJDK Runtime Environment (build 12+33)
OpenJDK 64-Bit Server VM (build 12+33, mixed mode, sharing)