The Computer Language
Benchmarks Game

Free Pascal 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.

binary-trees
source secs mem gz busy cpu load
Free Pascal 3.06 132,852 1003 10.34 100% 89% 70% 80%
Java 8.28 907,060 835 27.59 86% 90% 80% 77%
regex-redux
source secs mem gz busy cpu load
Free Pascal 3.88 103,124 1503 5.35 15% 15% 93% 14%
Java 10.48 645,680 740 31.62 72% 87% 74% 68%
pidigits
source secs mem gz busy cpu load
Free Pascal 1.73 2,436 530 1.80 99% 1% 1% 2%
Java 3.07 39,680 938 3.30 99% 3% 0% 5%
spectral-norm
source secs mem gz busy cpu load
Free Pascal 3.98 1,912 542 15.84 99% 99% 99% 99%
Java 4.19 36,740 950 16.36 98% 97% 98% 98%
n-body
source secs mem gz busy cpu load
Free Pascal 22.36 8 1325 22.46 0% 100% 0% 0%
Java 21.94 35,588 1429 22.39 100% 0% 1% 1%
fannkuch-redux
source secs mem gz busy cpu load
Free Pascal 17.95 1,860 1050 71.73 100% 100% 100% 100%
Java 17.04 34,236 1282 67.30 99% 98% 100% 98%
mandelbrot
source secs mem gz busy cpu load
Free Pascal 9.88 36,628 950 39.44 100% 100% 100% 100%
Java 5.98 79,184 796 23.43 98% 98% 97% 99%
reverse-complement
source secs mem gz busy cpu load
Free Pascal 7.86 499,600 771 7.93 0% 1% 1% 100%
Java 3.27 740,524 2183 7.44 44% 57% 84% 43%
fasta
source secs mem gz busy cpu load
Free Pascal 10.96 8 1140 11.09 1% 0% 0% 100%
Java 2.23 45,156 2473 5.99 51% 62% 59% 97%
k-nucleotide
source secs mem gz busy cpu load
  No program contribute your program
Java 8.70 446,004 1812 27.18 83% 78% 78% 73%
Free Pascal

Free Pascal Compiler version 3.0.4 [2017/10/03] for x86_64

Java

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