Rust versus C clang 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 clang #6 2.18 19,788 1582 8.63 C clang #4 13.08 19,660 1190 13.08 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 clang #5 8.31 19,784 917 32.84 C clang #2 8.85 19,660 1563 34.65 C clang #3 34.83 19,788 574 34.83 C clang 37.30 19,660 514 37.29 Rust #2 18.53 19,780 1198 73.32 n-body source secs mem gz cpu secs C clang #9 2.19 19,684 1639 2.19 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 Rust #8 4.51 19,788 1774 4.50 C clang #4 4.84 19,808 1496 4.84 C clang #5 4.85 19,808 1436 4.85 Rust #5 5.06 19,788 2224 5.06 Rust #4 5.21 19,660 1810 5.21 C clang #6 5.44 19,684 1186 5.44 Rust 5.51 19,660 1483 5.51 C clang #8 5.56 19,680 1398 5.56 C clang #2 5.57 19,684 1270 5.57 Rust #3 5.60 19,656 1546 5.60 C clang 5.65 19,684 1179 5.65 C clang #3 6.13 19,812 1214 6.13 C clang #7 6.70 19,812 1250 6.70 spectral-norm source secs mem gz cpu secs C clang #6 0.39 19,812 1203 1.55 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 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 clang #8 0.72 19,684 941 2.87 C clang #5 0.72 19,812 576 2.87 C clang #4 0.73 19,812 1145 2.89 C clang 5.39 19,684 390 5.39 C clang #3 1.44 19,812 470 5.74 C clang #7 2.24 19,684 906 8.92 mandelbrot source secs mem gz cpu secs Rust #4 0.96 33,280 1301 3.78 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 C clang #9 1.29 34,432 700 5.12 C clang #8 1.53 34,688 788 6.10 Rust 1.83 39,296 874 7.20 C clang 3.48 33,280 828 13.89 C clang #4 3.49 34,176 805 13.92 C clang #7 3.57 34,048 1000 14.16 C clang #3 3.57 33,152 769 14.23 C clang #2 25.43 19,680 412 25.43 C clang #6 Make Error pidigits source secs mem gz cpu secs Rust #4 0.71 19,660 804 0.71 C clang #2 0.81 19,684 422 0.81 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 clang 0.88 19,684 459 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 clang #5 0.81 154,520 1403 2.80 C clang #2 3.21 103,424 1121 3.21 C clang #4 0.96 154,248 1237 3.72 C clang #3 1.76 105,856 1273 4.33 fasta source secs mem gz cpu secs C clang #9 0.78 19,804 1469 0.78 C clang #5 1.08 19,672 1286 1.08 Rust #7 0.76 19,664 2533 1.51 Rust #3 2.00 19,656 1235 2.00 C clang #8 2.41 19,680 1299 2.41 C clang #6 1.01 19,808 1936 2.98 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 clang #2 0.83 19,676 2276 3.31 C clang #7 0.86 19,676 2018 3.31 Rust #4 3.45 123,784 944 3.45 Rust #6 3.48 123,784 959 3.48 C clang #3 4.48 19,676 825 4.48 Rust 4.52 19,656 1240 4.52 C clang #4 Make Error C clang Make Error k-nucleotide source secs mem gz cpu secs 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 clang 6.22 129,140 1512 13.57 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 clang #7 0.43 499,876 1899 0.59 C clang #8 0.46 500,004 1551 0.69 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 clang #2 1.13 994,432 757 1.64 C clang #5 2.04 994,176 654 2.04 C clang #4 3.77 500,480 716 3.77 C clang #6 0.98 706,852 828 3.89 binary-trees source secs mem gz cpu secs Rust #5 1.08 198,528 771 3.82 Rust #2 1.22 199,676 729 4.29 Rust #4 1.29 189,052 765 4.67 Rust #3 1.39 198,860 762 5.04 C clang #2 1.64 170,112 816 5.26 C clang #3 1.82 134,144 842 5.67 Rust 2.04 133,120 760 7.21 C clang 17.12 264,192 660 17.11 C clang #5 8.87 351,360 914 31.91 Rust 1.76.0 (07dca489a 2024-02-04) LLVM version: 17.0.6 C clang Ubuntu clang version 17.0.2 all Rust programs & measurements all C clang programs & measurements