The Computer Language
25.03 Benchmarks Game

Rust versus C gcc

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
* C gcc #6 2.14 8.44 2,712 1582 2.68
* C gcc #4 14.05 14.06 2,351 1190 2.31
* Rust #6 3.81 15.06 3,985 1260 11.92
Rust #4 6.94 27.12 3,985 1026 11.71
C gcc #5 7.28 28.32—28.45 2,949 917 2.17
Rust #5 7.41 28.89 3,990 1023 11.79
Rust #2 9.19 36.04—36.08 3,723 1198 11.14
C gcc #3 36.84 36.84—36.89 2,343 574 2.19
C gcc #8 39.34 39.52—40.22 2,343 483 2.20
C gcc 39.65 39.64—40.07 2,343 514 2.12
* C gcc #2 10.18 39.98—40.15 2,695 1563 2.51
n-body      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* C gcc #9 2.10 2.10 2,482 1639 2.99
* Rust #9 2.19 1.90—3.09 3,023 1881 11.01
* Rust #7 3.24 3.24 2,937 1759 10.53
Rust #3 3.46 3.46 2,937 1774 10.62
Rust #2 3.65 3.65 3,031 1809 10.49
* C gcc #4 4.06 4.06 2,499 1398 2.98
Rust #6 4.37 4.36—4.49 3,031 1796 10.86
C gcc #6 4.98 4.99 2,482 1186 2.33
* Rust #5 5.02 5.03 3,035 2224 10.61
Rust #4 5.13 4.99—5.53 3,039 1810 10.50
C gcc #2 5.20 5.20 2,490 1270 2.43
C gcc 5.23 5.23 2,486 1179 2.58
C gcc #3 5.24 5.24 2,482 1214 2.42
* C gcc #5 5.44 5.44 2,494 1436 2.31
Rust 5.52 5.50—5.60 3,027 1483 10.84
C gcc #8 5.54 5.54 2,486 1195 2.52
C gcc #7 6.89 6.90 2,490 1250 2.32
spectral-norm      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* C gcc #6 0.40 1.60 3,199 1203 3.38
* C gcc #5 0.72 2.86 3,858 576 2.52
* Rust #6 0.72 2.85 3,981 1132 12.60
Rust #4 0.72 2.85 4,047 823 12.00
* C gcc #7 0.72 2.86 4,067 906 3.21
Rust #5 0.72 2.86 4,018 1062 11.30
* C gcc #4 0.72 2.86 3,719 1145 2.49
* Rust #2 0.72 2.86 4,145 1117 11.00
* Rust 0.72 2.86 4,104 1262 11.75
* Rust #3 0.74 2.94 4,121 1060 10.92
C gcc #8 5.41 5.41 3,219 389 2.42
C gcc #3 1.43 5.71 4,080 470 2.42
Rust #7   Empty  
* C gcc #2   Empty  
mandelbrot      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
Rust #4 0.95 3.78 35,598 1301 12.26
Rust #6 1.08 4.21 36,426 1338 12.65
Rust #7 1.10 4.34 35,906 763 12.32
Rust #2 1.10 4.36—4.52 35,754 770 12.80
Rust #5 1.12 4.38 36,311 725 12.27
Rust #3 1.15 4.57 14,615 1013 12.66
* C gcc #6 1.29 5.11 35,578 1147 2.64
C gcc #5 1.64 6.32 35,582 788 2.38
Rust 2.01 7.90 42,631 874 10.94
* C gcc #4 3.50 13.91 35,197 805 2.16
* C gcc #7 3.51 13.94 35,447 1000 2.60
* C gcc 3.50 13.94 35,017 828 2.23
* C gcc #3 3.55 14.12 34,873 769 2.26
C gcc #9 4.07 15.72 35,394 700 2.47
C gcc #8 25.17 25.18 2,355 412 2.29
fasta      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
C gcc #3 0.79 0.79 2,236 1469 2.26
C gcc #5 1.24 1.25 2,154 1286 2.42
* Rust #7 0.78 1.55 4,772 2533 11.68
Rust #3 2.03 2.03 3,199 1235 10.95
C gcc #2 2.77 2.77 2,204 1299 2.25
C gcc #6 0.95 2.77—2.81 3,748 1936 2.44
Rust #9 0.94 3.20—3.33 5,534 1952 11.24
C gcc #7 0.83 3.28 4,514 2276 2.39
Rust #2 0.95 3.46—3.50 5,554 1910 11.45
Rust #5 0.94 3.48—3.53 5,554 1963 12.19
Rust #4 3.52 3.53 128,217 944 10.63
Rust #6 3.53 3.53 128,381 959 10.62
C gcc 3.71 3.71 2,421 1213 2.25
Rust 4.45 4.54—4.61 3,113 1240 11.09
C gcc #8 8.27 8.31—8.37 2,195 839 2.20
C gcc #4   Empty  
k-nucleotide      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
Rust #7 2.57 8.13—8.39 139,088 1585 13.43
Rust #3 3.28 9.72—10.13 142,631 1549 11.91
Rust #6 2.79 10.06—10.15 165,048 1697 14.10
Rust #5 3.88 11.66—11.92 143,155 1745 12.40
C gcc 3.58 12.06—12.40 135,234 1512 2.82
Rust #2 6.00 15.71—16.24 142,946 1350 11.85
Rust #9 6.33 17.72—18.82 141,099 1850 14.41
Rust #4 6.69 18.00—18.74 142,090 1755 13.13
Rust 21.08 64.42—65.12 161,219 1086 12.16
reverse-complement      
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
* C gcc #7 0.44 0.62 514,208 1899 3.13
C gcc #9 0.49 0.78 514,159 1551 2.20
* Rust 0.55 0.85 512,963 2762 11.72
C gcc #6 0.97 1.37 693,969 828 2.26
C gcc #5 1.54 1.54 1,020,662 654 2.05
C gcc #2 1.07 1.59 1,021,755 757 2.15
Rust #2 1.01 1.61 1,022,128 1332 11.04
Rust #3 1.02 1.72 1,022,034 1105 11.45
* C gcc #4 3.70 3.71 514,077 716 2.22
binary-trees      [ Contentious. Different approaches. ]
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
Rust #5 1.07 3.84—4.01 139,121 771 1.28
Rust #2 1.17 4.16—4.25 140,157 729 12.50
C gcc #2 1.56 4.30—4.45 174,780 816 3.21
C gcc #3 1.96 4.79—4.93 138,711 842 2.94
Rust #4 1.38 4.98—5.02 202,686 765 12.32
Rust #3 1.40 5.15—5.26 172,392 762 11.90
Rust 2.10 7.44 137,417 760 11.36
C gcc 21.21 21.39—21.70 272,065 660 2.37
C gcc #5 8.71 31.85—32.27 361,587 914 2.34
pidigits      [ Contentious. Different libraries. ]
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
Rust #4 0.71 0.72 4,055 804 11.82
C gcc #2 0.74 0.74 4,006 422 2.25
* Rust #2 0.75 0.75 4,387 1312 10.44
* Rust 0.75 0.75 4,243 1426 10.19
C gcc 0.75 0.75 3,727 459 2.30
* Rust #3 0.75 0.75 4,510 1373 10.10
regex-redux      [ Contentious. Different libraries. ]
  elapsed Mean or 95% CI      
source secs cpu secs mem gz make
Rust #6 1.21 1.46 159,846 994 13.12
Rust #5 1.35 1.58 209,863 777 12.67
Rust 1.35 1.59—1.63 159,793 811 12.22
Rust #3 1.38 1.63 210,379 726 13.51
Rust #4 1.38 1.64 206,811 771 12.41
Rust #2 1.38 1.64 159,937 707 11.67
* Rust #7 0.78 2.00 157,442 2464 12.48
C gcc #5 0.81 2.05 157,463 1403 2.47
C gcc #2 3.22 3.22 106,713 1121 2.14
C gcc #4 0.97 3.30 157,417 1237 2.18
C gcc #3 1.73 3.32 107,401 1273 2.27
Rust

1.84.1
(e71f9a9a9
2025-01-27)
LLVM version: 19.1.5

C gcc

gcc (Ubuntu 14.2.0-4ubuntu2) 14.2.0