The Computer Language
Benchmarks Game

Swift versus C gcc fastest programs

Always look at the source code.

These are only the fastest programs. Do some of them use manually vectorized SIMD? Look at the other programs. They may seem more-like a fair comparison to you.

mandelbrot
source secs mem gz busy cpu load
Swift 1.35 42,752 1141 5.36 99% 99% 99% 100%
C gcc 1.27 31,792 1135 5.08 100% 100% 99% 100%
fannkuch-redux
source secs mem gz busy cpu load
Swift 8.24 7,824 1097 32.69 98% 99% 100% 100%
C gcc 7.58 872 910 29.61 100% 98% 99% 93%
pidigits
source secs mem gz busy cpu load
Swift 0.89 9,256 600 0.91 3% 0% 0% 99%
C gcc 0.59 2,444 1090 2.37 100% 100% 100% 98%
fasta
source secs mem gz busy cpu load
Swift 1.41 26,396 2090 4.73 80% 80% 96% 79%
C gcc 0.78 1,156 1463 0.78 0% 0% 0% 100%
reverse-complement
source secs mem gz busy cpu load
Swift 1.81 781,992 1286 2.28 3% 0% 48% 75%
C gcc 0.86 712,208 820 1.27 99% 28% 1% 19%
n-body
source secs mem gz busy cpu load
Swift 5.32 10,456 1365 5.37 100% 0% 0% 0%
C gcc 2.18 768 1633 2.19 0% 100% 0% 0%
spectral-norm
source secs mem gz busy cpu load
Swift 1.43 8,144 601 5.68 100% 99% 99% 99%
C gcc 0.40 872 1197 1.58 100% 100% 100% 98%
k-nucleotide
source secs mem gz busy cpu load
Swift 13.56 256,964 1367 52.30 96% 95% 96% 99%
C gcc 3.72 130,260 1506 12.07 100% 89% 78% 57%
binary-trees
source secs mem gz busy cpu load
Swift 16.15 699,872 862 51.81 77% 66% 79% 100%
C gcc 1.54 168,832 809 4.35 60% 67% 57% 100%
regex-redux
source secs mem gz busy cpu load
Swift 23.14 1,059,096 745 48.76 92% 37% 46% 36%
C gcc 0.80 152,172 1397 2.01 52% 99% 48% 53%
Swift

Swift version 5.5-dev (LLVM f9e846e117057c8, Swift a58e8c181f2e258)
Target: x86_64-unknown-linux-gnu

C gcc

gcc (Ubuntu 10.3.0-1ubuntu1) 10.3.0