The Computer Language
24.11 Benchmarks Game

Swift versus Rust fastest performance

How the programs are written matters! Always look at the source code.

If the fastest programs are * hand-written vector instructions, does the host language matter? You might be more interested in the less optimised programs — more seconds, less gz source code.

fannkuch-redux
source secs mem gz cpu secs
* Rust #6 3.88 19,804 1260 15.27
Rust #4 6.93 19,804 1026 27.20
Rust #5 7.66 19,804 1023 29.90
* Swift #3 8.32 19,440 1103 32.99
Swift #8 35.13 19,444 470 35.12
Rust #2 9.15 19,804 1198 35.90
n-body
source secs mem gz cpu secs
* Rust #9 2.19 19,804 1881 2.19
* Rust #7 3.25 19,804 1759 3.24
Rust #2 3.94 19,804 1809 3.94
* Rust #6 4.30 19,804 1796 4.30
Rust #3 4.49 19,352 1774 4.49
* Rust #5 5.01 19,804 2224 5.01
Rust #4 5.10 19,804 1810 5.10
* Swift #3 5.43 19,440 1688 5.43
* Swift #4 5.46 19,440 1361 5.46
* Swift #5 5.49 19,440 1372 5.49
* Swift #7 5.50 19,440 1333 5.50
Rust 5.51 19,804 1483 5.51
Swift #6 5.78 19,440 1213 5.78
Swift #8 6.65 19,440 1285 6.65
Swift 7.85 19,440 1210 7.85
Swift #9 288.23 19,440 1532 288.20
spectral-norm
source secs mem gz cpu secs
* Rust #6 0.72 19,804 1132 2.85
Rust #4 0.72 19,804 823 2.85
* Rust #5 0.72 19,804 1062 2.85
* Rust #2 0.78 19,804 1117 2.98
* Rust 0.77 19,804 1262 2.99
* Rust #3 0.78 19,804 1060 3.00
Swift #8 5.33 19,568 411 5.33
Swift #3 1.43 19,440 607 5.69
* Rust #7   Make Error  
mandelbrot
source secs mem gz cpu secs
* Rust #4 0.94 33,408 1301 3.73
Rust #2 1.07 33,592 770 4.23
* Rust #6 1.08 34,048 1338 4.23
Rust #7 1.06 33,408 763 4.23
Rust #5 1.13 34,048 725 4.43
Rust #3 1.14 19,860 1013 4.54
* Swift #7 1.38 49,024 1147 5.49
* Swift #6 1.46 51,840 1147 5.78
Rust 2.00 39,296 874 7.84
Swift #8 25.59 19,492 426 25.59
Swift 26.45 19,440 400 26.45
Swift #5 7.25 43,648 665 27.03
* Swift #3   Bad Output  
fasta
source secs mem gz cpu secs
* Rust #7 0.77 19,804 2533 1.54
Rust #3 1.98 19,804 1235 1.97
Rust #2 0.92 19,932 1910 3.09
Rust #9 0.93 19,352 1952 3.13
Rust #5 0.94 19,932 1963 3.14
Rust #6 3.46 123,652 959 3.45
Rust #4 3.57 123,652 944 3.57
* Swift #2 2.11 19,440 1952 3.76
Rust 4.24 19,804 1240 4.24
* Swift 5.15 19,440 1533 5.14
* Swift #3 2.18 31,248 2097 5.40
Swift #8 18.86 19,972 828 18.86
k-nucleotide
source secs mem gz cpu secs
Rust #7 2.84 133,840 1585 8.91
Rust #6 2.96 159,600 1697 10.67
Rust #3 3.52 137,568 1549 10.78
Rust #5 3.96 137,844 1745 11.95
Rust #2 6.28 138,736 1350 16.39
Rust #9 6.44 135,800 1850 17.00
Rust #4 6.74 137,440 1755 18.30
* Swift #2 14.54 260,820 1373 55.20
Rust 22.54 157,124 1086 67.38
Swift #8 181.50 627,328 658 180.87
Swift #7 233.16 627,092 607 232.52
Swift   Make Error  
reverse-complement
source secs mem gz cpu secs
* Rust 0.53 498,816 2762 0.83
Rust #2 0.98 995,200 1332 1.62
Rust #3 0.98 995,200 1105 1.68
* Swift 1.95 798,228 1293 2.39
binary-trees
source secs mem gz cpu secs
Rust #5 1.08 198,656 771 3.77
Rust #2 1.22 199,684 729 4.29
Rust #4 1.33 187,948 765 4.80
Rust #3 1.40 188,740 762 5.06
Rust 2.05 132,992 760 7.21
Swift 18.28 737,152 720 54.20
Swift #8 54.90 402,048 567 54.89
Swift #4 17.49 707,456 772 55.84
Swift #5 18.89 738,048 813 56.25
Swift #2 18.29 707,456 822 58.16
Swift #3 18.18 707,584 868 58.24
* Swift #9   Make Error  
pidigits
source secs mem gz cpu secs
Rust #4 0.71 19,804 804 0.71
* Rust #3 0.74 19,804 1373 0.74
* Rust 0.74 19,804 1426 0.74
* Rust #2 0.74 19,804 1312 0.74
* Swift #2 0.75 19,440 606 0.75
regex-redux
source secs mem gz cpu secs
Rust #6 1.18 154,096 994 1.44
Rust 1.33 153,792 811 1.58
Rust #5 1.34 203,224 777 1.58
Rust #2 1.34 153,776 707 1.60
Rust #4 1.35 199,548 771 1.61
Rust #3 1.36 202,908 726 1.61
* Rust #7 0.78 149,888 2464 1.99
Swift #2 38.80 686,136 678 38.80
Swift 23.40 891,792 721 39.65
Swift #4 18.30 1,064,768 751 41.36
Swift

Swift version 6.0
(swift-6.0-RELEASE)
Target: x86_64-unknown-linux-gnu

Rust

1.80.1
(3f5fd8dd4
2024-08-06)
LLVM version: 18.1.7