The Computer Language
24.06 Benchmarks Game

Swift versus C clang 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
C clang #6 2.25 19,940 1582 8.89
C clang #4 13.18 19,684 1190 13.18
C clang #5 8.08 19,940 917 31.87
Swift 33.92 19,656 457 33.91
Swift #3 8.57 19,656 1103 33.94
C clang #3 34.04 19,684 574 34.04
C clang #2 8.88 19,684 1563 34.87
C clang 37.45 19,684 514 37.45
n-body
source secs mem gz cpu secs
C clang #9 2.20 19,684 1639 2.20
C clang #4 4.63 19,684 1496 4.63
C clang #5 4.86 19,684 1436 4.86
C clang #6 5.32 19,684 1186 5.32
Swift #4 5.49 19,688 1361 5.49
C clang #2 5.50 19,684 1270 5.50
C clang 5.51 19,716 1179 5.51
Swift #5 5.52 19,688 1372 5.52
Swift #7 5.54 19,700 1333 5.54
C clang #8 5.59 19,748 1398 5.59
Swift #6 5.99 19,700 1200 5.99
Swift #8 6.00 19,684 1688 5.99
C clang #3 6.12 19,684 1214 6.11
C clang #7 6.77 19,684 1250 6.77
Swift #3 8.12 19,688 1210 8.12
Swift #2 9.54 19,684 1198 9.54
Swift #9 287.21 19,688 1532 287.20
spectral-norm
source secs mem gz cpu secs
C clang #6 0.40 20,980 1203 1.57
C clang #5 0.72 19,700 576 2.87
C clang #8 0.73 19,700 941 2.88
C clang #4 0.73 20,820 1145 2.89
Swift 5.33 20,308 444 5.33
C clang 5.40 19,700 390 5.40
Swift #3 1.43 20,084 607 5.69
C clang #3 1.44 20,916 470 5.75
C clang #7 1.84 20,756 906 7.28
mandelbrot
source secs mem gz cpu secs
C clang #9 1.23 34,304 700 4.89
Swift #7 1.34 47,104 1147 5.30
Swift #6 1.45 50,048 1147 5.75
C clang #8 1.53 34,688 788 6.09
C clang #4 3.47 34,176 805 13.83
C clang 3.49 33,024 828 13.92
C clang #7 3.53 34,048 1000 14.02
C clang #3 3.58 32,896 769 14.26
C clang #2 25.50 19,684 412 25.49
Swift 26.47 19,664 400 26.47
Swift #5 7.24 43,392 665 27.01
C clang #6   Make Error  
Swift #3   Bad Output  
pidigits
source secs mem gz cpu secs
C clang #2 0.82 19,780 422 0.82
C clang 0.88 19,876 459 0.88
Swift #2 0.89 19,700 606 0.89
regex-redux
source secs mem gz cpu secs
C clang #5 0.82 154,520 1403 2.82
C clang #2 3.22 103,424 1121 3.22
C clang #4 0.97 154,248 1237 3.77
C clang #3 1.74 105,728 1273 4.32
Swift #2 42.42 684,644 678 42.42
Swift 24.44 889,924 721 43.38
Swift #4 20.99 1,055,220 751 44.94
fasta
source secs mem gz cpu secs
C clang #9 0.78 19,684 1469 0.78
C clang #5 1.19 19,684 1286 1.19
C clang #8 2.43 19,684 1299 2.43
C clang #6 1.01 19,684 1936 2.96
C clang #2 0.82 19,684 2276 3.26
C clang #7 0.85 19,684 2018 3.31
C clang 3.61 19,860 1213 3.61
C clang #3 4.58 19,860 825 4.58
Swift #2 3.14 19,664 1952 5.14
Swift 5.16 19,664 1533 5.16
Swift #3 2.18 29,456 2097 5.35
C clang #4   Make Error  
k-nucleotide
source secs mem gz cpu secs
C clang 6.37 129,248 1512 13.99
Swift #2 14.61 259,048 1373 55.63
Swift   Make Error  
reverse-complement
source secs mem gz cpu secs
C clang #7 0.44 499,748 1899 0.61
C clang #8 0.46 499,876 1551 0.70
C clang #2 1.15 994,560 757 1.67
C clang #5 2.07 994,176 654 2.07
Swift 1.95 796,836 1293 2.38
C clang #4 3.79 500,480 716 3.79
C clang #6 1.02 706,096 828 4.04
binary-trees
source secs mem gz cpu secs
C clang #2 1.64 170,112 816 5.30
C clang #3 1.84 134,144 842 5.79
C clang 17.79 264,064 660 17.79
C clang #5 9.39 351,232 914 33.96
Swift #5 14.19 736,000 813 42.47
Swift #2 13.67 705,152 822 43.96
Swift #3 13.67 705,408 868 44.28
Swift 20.52 735,360 720 60.79
Swift #4 19.86 705,280 772 63.33
Swift #9   Make Error  
Swift

Swift version 5.10
(swift-5.10-RELEASE)

C clang

Ubuntu clang version 18.1.3