The Computer Language
24.11 Benchmarks Game

Swift versus Go 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
* Swift #3 8.32 19,440 1103 32.99
Go #3 8.34 19,808 975 33.31
Swift #8 35.13 19,444 470 35.12
Go #8 46.13 19,440 500 46.24
Go 12.29 19,808 906 49.04
Go #2 12.35 19,808 903 49.32
n-body
source secs mem gz cpu secs
* 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
Swift #6 5.78 19,440 1213 5.78
Go #3 6.38 19,808 1207 6.40
Swift #8 6.65 19,440 1285 6.65
Go 7.01 19,808 1316 7.03
Go #2 7.03 19,808 1222 7.05
Swift 7.85 19,440 1210 7.85
Go #8 9.60 19,436 1224 9.62
Swift #9 288.23 19,440 1532 288.20
spectral-norm
source secs mem gz cpu secs
Swift #8 5.33 19,568 411 5.33
Go #8 5.33 19,416 429 5.34
Go 5.33 19,808 417 5.34
Go #2 1.50 19,808 674 5.68
Go #4 1.45 19,808 555 5.69
Swift #3 1.43 19,440 607 5.69
mandelbrot
source secs mem gz cpu secs
* Swift #7 1.38 49,024 1147 5.49
* Swift #6 1.46 51,840 1147 5.78
Go #4 3.76 35,456 912 14.99
Go #3 3.77 35,456 900 15.00
Go 5.02 33,024 829 20.02
Swift #8 25.59 19,492 426 25.59
Swift 26.45 19,440 400 26.45
Go #8 26.68 19,440 500 26.74
Swift #5 7.25 43,648 665 27.03
Go #2 6.85 33,152 843 27.28
Go #6 6.89 33,024 707 27.44
* Swift #3   Bad Output  
fasta
source secs mem gz cpu secs
Go 3.73 19,808 1055 3.74
* Swift #2 2.11 19,440 1952 3.76
Go #2 1.27 19,808 1405 4.06
Go #3 1.51 19,808 1362 4.09
* Swift 5.15 19,440 1533 5.14
* Swift #3 2.18 31,248 2097 5.40
Go #8 11.46 19,820 880 11.55
Swift #8 18.86 19,972 828 18.86
k-nucleotide
source secs mem gz cpu secs
Go #7 7.63 163,072 1613 28.79
Go #3 8.18 145,280 1729 29.88
Go #6 8.21 145,152 1596 30.01
Go #4 9.16 140,032 1552 31.38
* Swift #2 14.54 260,820 1373 55.20
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
Go #2 2.19 800,640 614 2.29
* Swift 1.95 798,228 1293 2.39
Go #3 2.48 800,384 609 2.57
Go #6 1.91 1,244,508 1340 3.40
Go #5   Bad Output  
Go   Failed  
binary-trees
source secs mem gz cpu secs
Go #6 27.90 404,096 618 29.26
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
Go #2 14.17 624,780 672 56.29
Go #3 14.91 326,508 806 58.00
Go #5 14.87 425,960 957 58.15
Swift #2 18.29 707,456 822 58.16
Swift #3 18.18 707,584 868 58.24
Go 32.01 243,192 488 59.78
Go #7 32.52 248,604 531 61.47
* Swift #9   Make Error  
pidigits
source secs mem gz cpu secs
* Swift #2 0.75 19,440 606 0.75
* Go #4 0.82 19,808 689 0.83
Go 1.18 19,808 715 1.20
* Go #3 1.40 19,808 610 1.44
Go #2 1.84 19,808 740 1.89
Go #6 2.46 19,512 727 2.46
Go #7 4.99 19,808 702 5.61
regex-redux
source secs mem gz cpu secs
Go #5 3.25 321,360 817 5.43
Go #4 14.61 369,008 832 35.91
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
Go 25.37 319,956 749 61.07
Go #3 25.62 371,204 836 61.79
Swift

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

Go

go version go1.23.1 linux/amd64
GOAMD64=v2