The Computer Language
24.06 Benchmarks Game

C++ g++ versus Rust 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++ g++ #6 3.26 19,712 1535 12.91
C++ g++ #7 13.96 19,712 1156 13.96
Rust #6 3.82 19,684 1260 15.13
Rust #4 7.58 19,684 1026 29.78
C++ g++ #5 8.00 19,712 987 31.23
Rust #5 8.00 19,684 1023 31.31
Rust #2 9.23 19,684 1198 36.15
C++ g++ #4 9.26 19,688 1445 36.31
C++ g++ #3 36.90 19,688 600 36.90
C++ g++ #2 9.55 19,712 1446 37.53
C++ g++ 10.87 19,712 1065 42.73
n-body
source secs mem gz cpu secs
C++ g++ #0 2.15 19,736 1933 2.15
Rust #9 2.16 19,716 1881 2.16
Rust #7 3.24 19,700 1759 3.24
Rust #2 3.94 19,700 1809 3.94
C++ g++ #7 3.96 19,736 1815 3.96
C++ g++ #2 4.20 19,736 1884 4.20
Rust #6 4.32 19,716 1796 4.32
Rust #8 4.49 19,684 1774 4.49
Rust #5 5.02 19,716 2224 5.02
Rust #4 5.18 19,716 1810 5.18
C++ g++ #3 5.31 19,736 1402 5.31
C++ g++ #9 5.44 19,736 1536 5.44
C++ g++ #4 5.45 19,736 1434 5.45
Rust 5.51 19,716 1483 5.51
Rust #3 5.56 19,716 1546 5.56
C++ g++ #5 6.02 19,736 1544 6.01
C++ g++ 6.50 19,736 1666 6.50
C++ g++ #8 6.54 19,736 1524 6.54
C++ g++ #6 6.91 19,736 1674 6.91
spectral-norm
source secs mem gz cpu secs
Rust #6 0.72 19,780 1132 2.85
C++ g++ #6 0.72 19,884 1050 2.85
Rust #5 0.72 19,748 1062 2.85
Rust #7 0.72 19,748 938 2.85
Rust #4 0.72 19,812 823 2.85
Rust 0.79 19,748 1262 3.02
Rust #2 0.78 19,748 1117 3.04
Rust #3 0.92 19,748 1060 3.56
C++ g++ #5 1.33 19,788 1050 5.27
C++ g++ 5.37 19,852 459 5.37
C++ g++ #8 1.52 19,820 1284 6.06
mandelbrot
source secs mem gz cpu secs
C++ g++ 0.89 34,944 1797 3.47
C++ g++ #4 0.89 35,328 3554 3.47
Rust #4 0.94 33,280 1301 3.73
C++ g++ #6 0.98 35,072 1014 3.90
Rust #6 1.07 34,048 1338 4.21
Rust #8 1.06 33,152 770 4.22
Rust #7 1.06 33,280 763 4.23
Rust #5 1.14 33,920 725 4.46
Rust #3 1.14 19,684 1013 4.54
Rust 2.04 39,168 874 7.88
C++ g++ #0 2.36 35,456 2752 9.30
C++ g++ #8 4.84 34,944 749 13.21
C++ g++ #5 13.35 34,560 596 13.35
C++ g++ #9 3.50 35,072 732 13.49
C++ g++ #7 3.51 35,072 1023 13.94
C++ g++ #2 16.94 34,560 700 16.94
C++ g++ #3 27.27 19,736 421 27.27
pidigits
source secs mem gz cpu secs
Rust #4 0.71 19,720 804 0.71
C++ g++ #5 0.87 19,736 804 0.87
Rust #3 0.88 19,720 1373 0.88
C++ g++ #4 0.89 19,736 521 0.88
Rust #2 0.89 19,720 1312 0.88
Rust 0.89 19,720 1426 0.89
regex-redux
source secs mem gz cpu secs
Rust #6 1.19 153,464 994 1.44
Rust #5 1.30 202,600 777 1.54
Rust 1.31 153,796 811 1.57
Rust #4 1.34 199,556 771 1.59
Rust #3 1.33 202,916 726 1.59
Rust #2 1.37 153,780 707 1.61
Rust #7 0.78 150,528 2464 2.00
C++ g++ #6 1.18 276,148 2856 2.23
C++ g++ 3.56 212,180 662 3.56
C++ g++ #2 2.86 212,648 706 3.62
C++ g++ #5 3.81 215,648 859 4.53
C++ g++ #3 12.46 215,472 859 18.08
C++ g++ #4   Make Error  
fasta
source secs mem gz cpu secs
Rust #7 0.77 19,684 2533 1.54
C++ g++ #8 0.78 19,712 2758 1.54
C++ g++ #2 1.80 19,712 1129 1.80
C++ g++ 1.90 19,712 1064 1.90
Rust #3 1.99 19,684 1235 1.99
C++ g++ #3 2.62 19,712 1311 2.62
Rust #8 0.94 19,684 1952 3.26
Rust #2 0.92 19,684 1910 3.33
C++ g++ #4 3.34 19,712 1291 3.34
Rust #5 0.92 19,684 1963 3.40
Rust #4 3.45 123,656 944 3.45
Rust #6 3.50 123,656 959 3.50
C++ g++ #5 1.07 19,712 2345 3.67
C++ g++ #6 1.07 19,712 2326 3.85
Rust 4.17 19,684 1240 4.17
C++ g++ #7   Make Error  
k-nucleotide
source secs mem gz cpu secs
C++ g++ #2 2.02 156,512 1634 6.09
Rust #7 2.85 133,876 1585 8.96
Rust #8 3.77 137,492 1549 10.88
Rust #6 3.01 159,340 1697 10.96
Rust #5 4.17 137,816 1745 12.38
C++ g++ #3 4.18 165,384 1280 13.93
C++ g++ 7.10 757,084 1452 14.78
Rust #2 6.30 138,236 1350 16.32
Rust #9 6.39 135,948 1850 17.33
Rust #4 6.57 137,384 1755 17.75
Rust 22.83 157,276 1086 69.30
reverse-complement
source secs mem gz cpu secs
C++ g++ #2 0.71 499,712 2099 0.71
Rust 0.52 498,688 2762 0.82
Rust #2 0.95 995,200 1332 1.59
Rust #3 0.96 995,200 1105 1.65
C++ g++ #6 3.26 1,517,580 1827 4.32
C++ g++ 6.50 979,912 599 6.50
C++ g++ #5 36.24 771,432 704 36.24
C++ g++ #3   Bad Output  
binary-trees
source secs mem gz cpu secs
C++ g++ #7 0.96 201,536 896 3.35
Rust #5 1.10 198,528 771 3.84
C++ g++ #5 1.15 200,660 891 4.08
Rust #2 1.24 199,684 729 4.40
C++ g++ #9 1.65 136,064 815 4.55
C++ g++ #6 1.92 266,112 851 4.74
Rust #4 1.31 181,692 765 4.74
C++ g++ #3 2.25 265,600 951 5.11
Rust #3 1.43 194,868 762 5.18
C++ g++ #8 2.22 266,112 826 5.26
Rust 2.04 132,736 760 7.18
C++ g++ 2.68 2,068,612 760 9.34
C++ g++ #2 21.96 265,856 514 21.96
C++ g++ #4   Make Error  
C++ g++

Ubuntu 13.2.0-23ubuntu4

Rust

1.78.0
(9b00956e5
2024-04-29)
LLVM version: 18.1.2