The Computer Language
24.09 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 2.25 19,940 1582 8.89
C clang #4 13.18 19,684 1190 13.18
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 8.08 19,940 917 31.87
C clang #3 34.04 19,684 574 34.04
C clang #2 8.88 19,684 1563 34.87
Rust #2 9.15 19,804 1198 35.90
C clang 37.45 19,684 514 37.45
n-body
source secs mem gz cpu secs
Rust #9 2.19 19,804 1881 2.19
C clang #9 2.20 19,684 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 #8 4.49 19,804 1774 4.49
C clang #4 4.63 19,684 1496 4.63
C clang #5 4.86 19,684 1436 4.86
Rust #5 5.01 19,804 2224 5.01
Rust #4 5.10 19,804 1810 5.10
C clang #6 5.32 19,684 1186 5.32
C clang #2 5.50 19,684 1270 5.50
Rust 5.51 19,804 1483 5.51
C clang 5.51 19,716 1179 5.51
Rust #3 5.57 19,804 1546 5.57
C clang #3 6.12 19,684 1214 6.11
C clang #7 6.77 19,684 1250 6.77
spectral-norm
source secs mem gz cpu secs
C clang #6 0.40 20,980 1203 1.57
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 #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
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 5.40 19,700 390 5.40
C clang #3 1.44 20,916 470 5.75
C clang #7 1.84 20,756 906 7.28
Rust #7   Make Error  
mandelbrot
source secs mem gz cpu secs
Rust #4 0.94 33,408 1301 3.73
Rust #8 1.06 33,408 770 4.22
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 1.23 34,304 700 4.89
C clang #8 1.53 34,688 788 6.09
Rust 2.00 39,296 874 7.84
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
C clang #6   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
C clang #2 0.82 19,780 422 0.82
C clang 0.88 19,876 459 0.88
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 0.82 154,520 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
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
Rust #7 0.77 19,804 2533 1.54
Rust #3 1.98 19,804 1235 1.97
C clang #8 2.43 19,684 1299 2.43
C clang #6 1.01 19,684 1936 2.96
Rust #2 0.92 19,932 1910 3.09
Rust #8 0.93 19,804 1952 3.14
Rust #5 0.94 19,932 1963 3.14
C clang #2 0.82 19,684 2276 3.26
C clang #7 0.85 19,684 2018 3.31
Rust #6 3.46 123,652 959 3.45
Rust #4 3.57 123,652 944 3.57
C clang 3.61 19,860 1213 3.61
Rust 4.24 19,804 1240 4.24
C clang #3 4.58 19,860 825 4.58
C clang #4   Make Error  
k-nucleotide
source secs mem gz cpu secs
Rust #7 2.84 133,840 1585 8.91
Rust #8 3.53 137,372 1549 10.47
Rust #6 2.96 159,600 1697 10.67
Rust #5 3.96 137,844 1745 11.95
C clang 6.37 129,248 1512 13.99
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 0.44 499,748 1899 0.61
C clang #8 0.46 499,876 1551 0.70
Rust 0.53 498,816 2762 0.83
Rust #2 0.98 995,200 1332 1.62
C clang #2 1.15 994,560 757 1.67
Rust #3 0.98 995,200 1105 1.68
C clang #5 2.07 994,176 654 2.07
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
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 1.64 170,112 816 5.30
C clang #3 1.84 134,144 842 5.79
Rust 2.05 132,992 760 7.21
C clang 17.79 264,064 660 17.79
C clang #5 9.39 351,232 914 33.96
Rust

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

C clang

Ubuntu clang version 18.1.3