The Computer Language
24.11 Benchmarks Game

Rust 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 2.24 19,772 1582 8.86
* C clang #4 13.37 19,772 1190 13.37
* 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
C clang #5 8.09 19,772 917 31.94
* C clang #2 8.67 19,772 1563 34.02
C clang #3 34.16 19,772 574 34.15
Rust #2 9.15 19,804 1198 35.90
C clang #8 36.39 19,492 483 36.38
C clang 36.51 19,772 514 36.50
n-body
source secs mem gz cpu secs
* Rust #9 2.19 19,804 1881 2.19
* C clang #9 2.20 19,772 1639 2.20
* 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
* C clang #5 4.86 19,772 1436 4.86
* Rust #5 5.01 19,804 2224 5.01
Rust #4 5.10 19,804 1810 5.10
C clang #6 5.16 19,772 1186 5.16
C clang 5.37 19,772 1179 5.37
C clang #2 5.42 19,772 1270 5.42
Rust 5.51 19,804 1483 5.51
* C clang #4 5.60 19,772 1398 5.59
C clang #8 5.72 19,492 1193 5.72
C clang #3 6.12 19,772 1214 6.12
C clang #7 6.77 19,772 1250 6.77
spectral-norm
source secs mem gz cpu secs
* C clang #6 0.38 19,772 1203 1.52
* 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
* C clang #4 0.72 19,772 1145 2.86
* C clang #2 0.72 19,772 941 2.87
* C clang #5 0.72 19,772 576 2.88
* 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
C clang #8 5.40 19,772 389 5.40
C clang #3 1.46 19,772 470 5.77
* C clang #7 1.82 19,772 906 7.24
* 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
C clang #9 1.22 34,332 700 4.85
C clang #5 1.53 34,864 788 6.09
Rust 2.00 39,296 874 7.84
* C clang #4 3.47 34,328 805 13.82
* C clang 3.49 33,172 828 13.93
* C clang #7 3.53 34,216 1000 14.00
* C clang #3 3.55 33,108 769 14.15
C clang #8 25.27 19,496 412 25.27
* C clang #6   Make Error  
fasta
source secs mem gz cpu secs
C clang #9 0.78 19,772 1469 0.78
C clang #5 1.19 19,772 1286 1.19
* Rust #7 0.77 19,804 2533 1.54
Rust #3 1.98 19,804 1235 1.97
C clang #7 2.43 19,772 1299 2.43
C clang #6 1.03 19,772 1936 3.03
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
C clang #2 0.83 19,772 2276 3.28
Rust #6 3.46 123,652 959 3.45
C clang 3.46 19,772 1213 3.46
Rust #4 3.57 123,652 944 3.57
Rust 4.24 19,804 1240 4.24
C clang #8 4.60 19,772 825 4.60
C clang #4   Make Error  
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
C clang 6.30 129,228 1512 13.92
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
Rust 22.54 157,124 1086 67.38
reverse-complement
source secs mem gz cpu secs
* C clang #7 0.45 499,996 1899 0.63
C clang #9 0.46 499,976 1551 0.70
* 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
C clang #2 1.16 994,536 757 1.69
C clang #5 2.08 994,108 654 2.07
* C clang #4 3.74 500,452 716 3.74
C clang #6 1.03 703,416 828 4.07
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
C clang #2 1.66 170,236 816 5.36
C clang #3 1.89 134,272 842 5.88
Rust 2.05 132,992 760 7.21
C clang 17.79 264,064 660 17.79
C clang #8 19.63 285,536 607 19.62
C clang #5 9.25 351,328 914 33.65
pidigits
source secs mem gz cpu secs
Rust #4 0.71 19,804 804 0.71
C clang #2 0.74 19,772 422 0.74
* Rust #3 0.74 19,804 1373 0.74
* Rust 0.74 19,804 1426 0.74
C clang 0.74 19,772 459 0.74
* Rust #2 0.74 19,804 1312 0.74
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
C clang #5 0.82 154,568 1403 2.82
C clang #2 3.22 103,364 1121 3.22
C clang #4 0.98 154,488 1237 3.82
C clang #3 1.75 105,848 1273 4.31
Rust

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

C clang

Ubuntu clang version 18.1.8 (11)