The Computer Language
Benchmarks Game

Java versus C gcc 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.

fasta
source secs mem gz busy cpu load
Java 2.23 45,156 2473 5.99 51% 62% 59% 97%
C gcc 1.36 2,912 2268 5.42 99% 100% 99% 99%
k-nucleotide
source secs mem gz busy cpu load
Java 8.70 446,004 1812 27.18 83% 78% 78% 73%
C gcc 5.01 130,104 1506 16.41 84% 100% 84% 59%
pidigits
source secs mem gz busy cpu load
Java 3.07 39,680 938 3.30 99% 3% 0% 5%
C gcc 1.75 2,660 452 2.02 1% 100% 14% 1%
reverse-complement
source secs mem gz busy cpu load
Java 3.27 740,524 2183 7.44 44% 57% 84% 43%
C gcc 1.78 994,532 1438 4.02 42% 96% 46% 43%
fannkuch-redux
source secs mem gz busy cpu load
Java 17.04 34,236 1282 67.30 99% 98% 100% 98%
C gcc 8.61 880 910 33.96 95% 100% 99% 100%
spectral-norm
source secs mem gz busy cpu load
Java 4.19 36,740 950 16.36 98% 97% 98% 98%
C gcc 1.98 1,252 1139 7.88 99% 100% 99% 99%
binary-trees
source secs mem gz busy cpu load
Java 8.28 907,060 835 27.59 86% 90% 80% 77%
C gcc 3.48 168,744 809 11.47 99% 74% 79% 79%
n-body
source secs mem gz busy cpu load
Java 21.94 35,588 1429 22.39 100% 0% 1% 1%
C gcc 7.49 8 1391 7.56 0% 0% 100% 1%
mandelbrot
source secs mem gz busy cpu load
Java 5.98 79,184 796 23.43 98% 98% 97% 99%
C gcc 1.65 26,204 1135 6.56 99% 100% 99% 99%
regex-redux
source secs mem gz busy cpu load
Java 10.48 645,680 740 31.62 72% 87% 74% 68%
C gcc 1.46 152,236 1397 3.43 43% 100% 45% 48%
Java

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

C gcc

gcc (Ubuntu 8.3.0-6ubuntu1) 8.3.0