Rust versus C++ g++ fastest performance 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 3.25 19,788 1535 12.89 C++ g++ #7 13.93 19,660 1156 13.93 Rust #6 4.00 19,652 1260 15.86 Rust #4 7.10 19,652 1026 27.94 Rust #5 7.88 19,784 1023 30.85 C++ g++ #5 7.97 19,788 987 31.14 C++ g++ #3 36.80 19,660 600 36.80 C++ g++ #4 9.47 19,660 1445 37.11 C++ g++ #2 9.82 19,656 1446 38.58 C++ g++ 10.59 19,660 1065 41.61 Rust #2 18.53 19,780 1198 73.32 n-body source secs mem gz cpu secs C++ g++ #0 2.14 19,676 1933 2.14 Rust #9 2.20 19,660 1881 2.20 Rust #7 3.13 19,660 1759 3.13 Rust #2 3.92 19,660 1809 3.92 Rust #6 3.95 19,788 1796 3.95 C++ g++ #7 3.97 19,804 1815 3.97 C++ g++ #2 4.20 19,676 1884 4.19 Rust #8 4.51 19,788 1774 4.50 Rust #5 5.06 19,788 2224 5.06 Rust #4 5.21 19,660 1810 5.21 C++ g++ #3 5.30 19,804 1402 5.30 C++ g++ #9 5.43 19,676 1536 5.43 C++ g++ #4 5.44 19,804 1434 5.44 Rust 5.51 19,660 1483 5.51 Rust #3 5.60 19,656 1546 5.60 C++ g++ #5 6.01 19,676 1544 6.00 C++ g++ 6.49 19,676 1666 6.49 C++ g++ #8 6.57 19,676 1524 6.57 C++ g++ #6 6.89 19,676 1674 6.89 spectral-norm source secs mem gz cpu secs Rust #2 0.72 19,668 1117 2.58 Rust 0.74 19,668 1262 2.60 Rust #3 0.79 19,796 1060 2.83 C++ g++ #6 0.72 19,812 1050 2.84 Rust #6 0.72 19,668 1132 2.84 Rust #4 0.72 19,796 823 2.85 Rust #7 0.72 19,796 938 2.85 Rust #5 0.72 19,668 1062 2.85 C++ g++ #5 1.32 19,684 1050 5.25 C++ g++ 5.36 19,684 459 5.36 C++ g++ #8 1.52 19,684 1284 6.04 mandelbrot source secs mem gz cpu secs C++ g++ 0.89 34,944 1797 3.46 C++ g++ #4 0.89 35,200 3554 3.47 Rust #4 0.96 33,280 1301 3.78 C++ g++ #6 0.98 35,072 1014 3.89 Rust #6 1.07 34,048 1338 4.20 Rust #8 1.06 33,280 770 4.21 Rust #7 1.06 33,280 763 4.21 Rust #5 1.12 33,920 725 4.40 Rust #3 1.14 19,656 1013 4.51 Rust 1.83 39,296 874 7.20 C++ g++ #0 2.35 35,328 2752 9.28 C++ g++ #8 4.79 35,072 749 13.12 C++ g++ #5 13.33 34,688 596 13.33 C++ g++ #9 3.50 35,200 732 13.49 C++ g++ #7 3.49 35,072 1023 13.90 C++ g++ #2 16.90 34,560 700 16.90 C++ g++ #3 27.26 19,804 421 27.25 pidigits source secs mem gz cpu secs Rust #4 0.71 19,660 804 0.71 C++ g++ #5 0.86 19,804 804 0.86 Rust 0.88 19,660 1426 0.88 Rust #3 0.88 19,660 1373 0.88 Rust #2 0.88 19,660 1312 0.88 C++ g++ #4 0.88 19,804 521 0.88 regex-redux source secs mem gz cpu secs Rust #6 1.19 153,584 994 1.44 Rust #5 1.28 202,584 777 1.52 Rust 1.30 154,416 811 1.52 Rust #4 1.30 199,540 771 1.54 Rust #3 1.31 202,684 726 1.56 Rust #2 1.34 153,896 707 1.58 Rust #7 0.78 150,272 2464 1.99 C++ g++ #6 1.15 276,276 2856 2.18 C++ g++ #2 2.84 212,776 706 3.60 C++ g++ 3.62 212,180 662 3.62 C++ g++ #5 3.86 215,556 859 4.54 C++ g++ #3 12.41 217,580 859 17.91 C++ g++ #4 Make Error fasta source secs mem gz cpu secs C++ g++ #8 0.76 19,792 2758 1.51 Rust #7 0.76 19,664 2533 1.51 C++ g++ #2 1.81 19,668 1129 1.81 C++ g++ 1.90 19,664 1064 1.90 Rust #3 2.00 19,656 1235 2.00 C++ g++ #3 2.62 19,664 1311 2.62 Rust #8 0.92 19,784 1952 3.10 Rust #2 0.91 19,656 1910 3.29 Rust #5 0.91 19,656 1963 3.30 C++ g++ #4 3.32 19,664 1291 3.32 Rust #4 3.45 123,784 944 3.45 Rust #6 3.48 123,784 959 3.48 C++ g++ #6 1.05 19,668 2326 3.85 C++ g++ #5 1.05 19,668 2345 3.88 Rust 4.52 19,656 1240 4.52 C++ g++ #7 Make Error k-nucleotide source secs mem gz cpu secs C++ g++ #2 1.97 156,504 1634 5.87 Rust #7 2.86 134,084 1585 9.12 Rust #8 3.68 137,580 1549 10.41 Rust #6 2.90 159,464 1697 10.51 Rust #5 3.91 137,764 1745 11.86 C++ g++ #3 4.19 165,592 1280 13.77 C++ g++ 6.90 757,080 1452 14.68 Rust #2 6.10 139,388 1350 16.32 Rust #9 6.77 135,684 1850 18.07 Rust #4 6.70 137,288 1755 18.12 Rust 21.62 157,080 1086 64.67 reverse-complement source secs mem gz cpu secs C++ g++ #2 0.70 499,840 2099 0.70 Rust 0.52 498,816 2762 0.83 Rust #2 0.85 995,200 1332 1.50 Rust #3 0.87 995,072 1105 1.58 C++ g++ #6 3.20 1,517,660 1827 4.22 C++ g++ 6.56 980,060 599 6.56 C++ g++ #5 35.10 771,556 704 35.10 C++ g++ #3 Bad Output binary-trees source secs mem gz cpu secs C++ g++ #7 0.95 201,400 896 3.30 Rust #5 1.08 198,528 771 3.82 C++ g++ #5 1.14 200,660 891 3.98 Rust #2 1.22 199,676 729 4.29 C++ g++ #9 1.72 135,936 815 4.46 C++ g++ #6 1.88 266,112 851 4.47 Rust #4 1.29 189,052 765 4.67 C++ g++ #3 1.88 265,600 951 4.72 Rust #3 1.39 198,860 762 5.04 C++ g++ #8 2.18 265,984 826 5.11 Rust 2.04 133,120 760 7.21 C++ g++ 2.65 2,040,792 760 9.07 C++ g++ #2 21.51 265,856 514 21.51 C++ g++ #4 Make Error Rust 1.76.0 (07dca489a 2024-02-04) LLVM version: 17.0.6 C++ g++ Ubuntu 13.2.0-4ubuntu3 all Rust programs & measurements all C++ g++ programs & measurements