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 2.24 44,876 2473 6.13 18% 79% 79% 97%
C gcc 1.36 2,912 2268 5.42 99% 100% 99% 99%
pidigits
source secs mem gz busy cpu load
Java 3.07 39,184 938 3.29 99% 3% 4% 1%
C gcc 1.75 2,660 452 2.02 1% 100% 14% 1%
k-nucleotide
source secs mem gz busy cpu load
Java 9.06 435,240 1812 28.35 98% 73% 72% 69%
C gcc 5.01 130,104 1506 16.41 84% 100% 84% 59%
reverse-complement
source secs mem gz busy cpu load
Java 3.26 738,800 2183 7.49 44% 63% 73% 48%
C gcc 1.78 994,532 1438 4.02 42% 96% 46% 43%
fannkuch-redux
source secs mem gz busy cpu load
Java 17.93 34,616 1282 70.89 98% 100% 98% 99%
C gcc 8.61 880 910 33.96 95% 100% 99% 100%
spectral-norm
source secs mem gz busy cpu load
Java 4.20 36,636 950 16.37 97% 98% 97% 97%
C gcc 1.98 1,252 1139 7.88 99% 100% 99% 99%
binary-trees
source secs mem gz busy cpu load
Java 8.29 966,764 835 27.76 86% 80% 86% 83%
C gcc 3.48 168,744 809 11.47 99% 74% 79% 79%
n-body
source secs mem gz busy cpu load
Java 21.91 35,356 1429 22.28 100% 0% 0% 1%
C gcc 7.49 8 1391 7.56 0% 0% 100% 1%
mandelbrot
source secs mem gz busy cpu load
Java 6.90 78,956 796 27.14 99% 98% 98% 98%
C gcc 1.65 26,204 1135 6.56 99% 100% 99% 99%
regex-redux
source secs mem gz busy cpu load
Java 10.25 634,884 740 30.23 68% 95% 67% 65%
C gcc 1.46 152,236 1397 3.43 43% 100% 45% 48%
Java

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

C gcc

gcc (Ubuntu 8.3.0-6ubuntu1) 8.3.0