The Computer Language
25.03 Benchmarks Game

Java versus Swift

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

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

fannkuch-redux      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* Swift #3 8.20 32.45—32.61 13,722 1103 12.93
Swift #8 34.68 34.68—34.74 13,484 470 12.33
Java #3 40.02 40.12—40.21 62,652 1264 1.69
Java 10.48 42.17—43.29 62,661 1289 1.73
Java #2 45.41 45.13—51.49 60,027 520 1.68
Java #8 46.66 49.88—55.68 59,994 517 1.65
n-body      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* Swift #3 5.45 5.44—5.48 24,928 1688 14.75
* Swift #4 5.48 5.49 24,846 1361 13.94
* Swift #5 5.52 5.50—5.55 24,928 1372 12.83
* Swift #7 5.53 5.52 24,932 1333 13.80
Swift #6 5.82 5.81 12,956 1213 12.42
Swift #8 6.66 6.56—6.95 12,804 1285 12.85
Java #4 6.92 6.94 60,592 1495 1.65
Java #5 7.34 7.39 61,669 1435 1.78
Java #2 7.51 7.53 60,846 1430 1.71
Java #3 7.52 7.54 61,186 1436 1.65
Java #8 7.61 7.66 60,953 1322 1.67
Swift 7.89 7.88 12,812 1210 12.10
Java 7.89 7.91 61,276 1437 1.70
Swift #9 287.37 287.38—288.05 24,793 1532 13.91
spectral-norm      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
Swift #8 5.36 5.35 24,859 411 14.09
Java 5.47 5.51 61,817 521 1.51
Java #8 5.47 5.51 62,308 453 1.72
Swift #3 1.45 5.71 13,689 607 12.54
Java #3 1.61 6.01 62,812 762 1.68
Java #2 1.65 6.16—6.20 61,784 956 2.76
mandelbrot      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* Swift #7 1.35 5.29 57,836 1147 14.15
* Swift #6 1.48 5.80 60,985 1147 14.36
Java #2 4.16 16.30—16.44 101,253 802 1.72
Java #4 4.44 16.15—16.21 124,953 667 1.66
Java #6 4.21 16.67—17.00 100,794 808 1.78
Java 24.54 24.65—24.78 60,711 671 1.81
Swift #8 25.62 25.60—25.64 12,784 426 11.26
Swift 26.55 26.54 12,780 400 12.99
Swift #5 7.27 27.13 49,312 665 13.83
Java #8 27.72 27.85—27.91 63,836 441 1.74
Java #3 7.11 28.81—34.50 101,401 910 1.91
* Swift #3   Bad Output  
fasta      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
Java #4 3.32 3.42 62,726 1528 1.74
Java #6 1.20 3.73 68,055 2549 1.91
Java #5 1.27 3.95—4.17 68,420 2478 1.86
Java #2 4.41 4.64—4.73 65,995 1259 1.75
* Swift 5.37 5.38 12,546 1533 13.34
* Swift #3 2.20 5.37 39,002 2097 14.73
* Swift #2 3.15 5.63—5.96 13,726 1952 14.91
Java #8 10.27 10.94—11.09 202,166 894 1.99
Swift #8 18.19 18.18—18.35 12,829 828 11.99
k-nucleotide      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
Java 4.94 16.37—17.19 459,260 1821 2.19
Java #3 7.25 25.39—25.58 389,857 1642 2.01
Java #6 7.27 25.30—26.29 389,628 1614 2.19
Java #4 34.38 34.66—36.43 218,042 1887 2.05
Java #5 20.48 44.95—46.24 243,007 2225 2.12
* Swift #2 14.45 54.24—57.70 273,949 1373 15.39
Java #8 79.72 83.79—87.16 1,484,460 786 2.09
Swift #8 166.95 168.68—173.38 650,023 658 14.46
Swift #7 223.40 226.91—248.09 650,023 607 13.04
Swift   Empty  
reverse-complement      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* Swift 2.05 2.48 825,635 1293 14.28
Java #6 3.20 3.84 2,103,058 760 1.69
Java #5 4.81 4.93—5.10 1,143,575 1115 1.66
Java #4 5.73 5.87—5.94 1,958,097 656 1.58
Java #7   Bad Output  
Java #3   Bad Output  
binary-trees      [ Contentious. Different approaches. ]
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
Java #4 4.45 5.56—5.91 1,804,603 846 2.63
Java #6 4.91 5.73—5.77 1,792,643 535 1.59
Java #3 4.92 5.73—5.85 1,733,562 546 1.55
Java #2 5.05 5.84—5.91 1,792,967 558 1.78
Java #7 2.62 8.09—8.18 1,778,696 841 1.88
Swift 18.21 54.03—54.29 763,523 720 13.97
Swift #4 17.62 54.69—59.64 733,094 772 13.31
Swift #5 18.90 56.44—56.88 764,391 813 14.89
Swift #3 18.26 58.41—58.87 733,180 868 18.46
Swift #2 18.24 58.41—58.84 732,828 822 14.89
* Swift #9   Empty  
pidigits      [ Contentious. Different libraries. ]
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* Swift #2 0.76 0.75 14,459 606 12.50
* Java #3 0.84 0.86 60,424 770 1.73
* Java #4 1.05 1.27 78,606 733 3.62
* Java #2 1.34 1.41 65,090 944 1.71
Java 7.72 8.78—8.83 453,767 807 1.56
regex-redux      [ Contentious. Different libraries. ]
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* Java #2 1.60 3.19 386,425 2201 3.75
Java 8.45 16.81—16.98 533,582 875 1.81
Java #6 5.61 17.10—17.43 1,287,463 746 1.82
Java #3 5.30 17.04—17.22 636,994 935 1.82
Swift #2 39.33 39.34—39.45 710,697 678 13.66
Swift 23.92 40.23—40.37 922,243 721 13.56
Swift #4 18.21 41.75—42.40 1,102,254 751 13.30
Java

java 23 2024-09-17
Java HotSpot(TM) 64-Bit Server VM
(build 23+37-2369,
mixed mode, sharing)

Swift

Swift version 6.0.3
(swift-6.0.3-RELEASE)
Target: x86_64-unknown-linux-gnu