The Computer Language
24.06 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 3.92 19,072 1260 15.36
Rust #4 6.96 19,072 1026 27.18
Rust #5 7.72 19,072 1023 30.41
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 9.42 19,072 1198 36.90
C clang 37.45 19,684 514 37.45
n-body
source secs mem gz cpu secs
Rust #9 2.17 19,072 1881 2.17
C clang #9 2.20 19,684 1639 2.20
Rust #7 3.24 19,072 1759 3.24
Rust #2 3.94 19,072 1809 3.94
Rust #6 4.31 19,072 1796 4.30
Rust #8 4.49 19,072 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 19,072 2224 5.01
Rust #4 5.17 19,072 1810 5.17
C clang #6 5.32 19,684 1186 5.32
C clang #2 5.50 19,684 1270 5.50
C clang 5.51 19,716 1179 5.51
Rust 5.51 19,072 1483 5.51
Rust #3 5.55 19,072 1546 5.55
C clang #8 5.59 19,748 1398 5.59
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 #4 0.72 19,076 823 2.85
Rust #6 0.72 19,076 1132 2.85
Rust #5 0.72 19,076 1062 2.85
Rust #7 0.72 19,076 938 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 19,076 1117 3.03
Rust 0.79 19,076 1262 3.04
Rust #3 0.92 19,076 1060 3.57
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
mandelbrot
source secs mem gz cpu secs
Rust #4 0.94 33,280 1301 3.73
Rust #6 1.08 34,048 1338 4.22
Rust #7 1.06 33,280 763 4.22
Rust #8 1.06 33,280 770 4.22
Rust #5 1.13 33,792 725 4.45
Rust #3 1.14 19,072 1013 4.54
C clang #9 1.23 34,304 700 4.89
C clang #8 1.53 34,688 788 6.09
Rust 2.03 39,168 874 7.89
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 19,076 804 0.71
Rust #3 0.74 19,076 1373 0.74
Rust 0.74 19,076 1426 0.74
Rust #2 0.75 19,076 1312 0.75
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 1.19 153,456 994 1.45
Rust #5 1.31 202,588 777 1.56
Rust 1.34 153,776 811 1.58
Rust #4 1.34 199,540 771 1.60
Rust #2 1.35 153,780 707 1.60
Rust #3 1.36 202,904 726 1.62
Rust #7 0.78 151,040 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 19,072 2533 1.54
Rust #3 1.99 19,072 1235 1.99
C clang #8 2.43 19,684 1299 2.43
C clang #6 1.01 19,684 1936 2.96
Rust #8 0.92 19,072 1952 3.11
C clang #2 0.82 19,684 2276 3.26
C clang #7 0.85 19,684 2018 3.31
Rust #5 0.93 19,072 1963 3.37
Rust #2 0.94 19,072 1910 3.37
Rust #6 3.47 123,656 959 3.46
Rust #4 3.58 123,656 944 3.58
C clang 3.61 19,860 1213 3.61
Rust 4.21 19,072 1240 4.21
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 2.84 133,808 1585 8.92
Rust #8 3.55 137,360 1549 10.66
Rust #6 3.00 159,596 1697 10.88
Rust #5 3.96 137,896 1745 11.92
C clang 6.37 129,248 1512 13.99
Rust #2 6.37 137,736 1350 16.21
Rust #9 6.36 135,720 1850 17.37
Rust #4 6.64 137,260 1755 17.99
Rust 22.12 157,252 1086 66.01
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 0.96 995,072 1332 1.59
C clang #2 1.15 994,560 757 1.67
Rust #3 0.98 995,200 1105 1.70
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 1.05 198,528 771 3.67
Rust #2 1.20 199,556 729 4.26
Rust #4 1.35 198,900 765 4.88
Rust #3 1.43 193,728 762 5.15
C clang #2 1.64 170,112 816 5.30
C clang #3 1.84 134,144 842 5.79
Rust 2.07 132,736 760 7.36
C clang 17.79 264,064 660 17.79
C clang #5 9.39 351,232 914 33.96
Rust

1.79.0
(129f3b996
2024-06-10)
LLVM version: 18.1.7

C clang

Ubuntu clang version 18.1.3