Fastest cpu secs Rust versus C gcc 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 cpu seconds, less gz source code. fannkuch-redux source mem gz cpu C gcc #6 1,044 1576 8.26 C gcc #4 964 1183 13.89 Rust #6 1,372 1253 14.15 C gcc #5 1,072 910 29.38 Rust #4 1,372 1020 30.06 Rust #3 1,336 1020 30.07 Rust #5 1,368 1016 30.11 C gcc #3 1,016 567 42.18 C gcc 988 508 43.27 C gcc #2 1,140 1557 45.01 Rust #2 1,232 1191 72.42 n-body source mem gz cpu C gcc #9 992 1633 2.12 Rust #9 1,052 1874 2.89 Rust #7 1,052 1753 3.24 Rust #6 1,028 1790 4.05 C gcc #8 8 1391 4.10 C gcc #4 1,304 1490 4.44 Rust #3 1,108 1540 5.49 Rust #2 1,032 1805 5.67 Rust 1,044 1480 5.68 Rust #8 1,104 1767 5.78 C gcc #5 1,020 1429 6.10 Rust #5 1,104 2220 6.10 Rust #4 1,088 1803 6.25 C gcc #7 1,300 1244 6.79 C gcc #2 1,264 1263 7.19 C gcc #6 1,304 1180 7.21 C gcc #3 1,304 1208 7.23 C gcc 1,264 1173 7.55 spectral-norm source mem gz cpu C gcc #6 1,068 1197 1.57 Rust #5 2,560 1055 2.84 Rust #6 2,432 1126 2.84 Rust #7 2,436 932 2.84 Rust #4 2,640 817 2.84 C gcc #5 1,344 569 2.85 C gcc #4 1,352 1139 2.85 Rust #2 1,312 1110 2.87 Rust 1,276 1254 2.87 Rust #3 1,248 1053 2.98 C gcc 1,248 383 5.38 C gcc #3 1,348 463 5.68 mandelbrot source mem gz cpu Rust #6 33,872 1332 4.18 C gcc #6 31,244 1135 5.12 Rust #8 32,624 763 5.48 Rust #7 32,732 757 5.50 Rust #3 12,824 1007 5.52 C gcc #8 33,068 782 6.29 Rust 38,672 868 6.87 Rust #5 33,948 719 10.40 C gcc #4 32,704 799 13.81 C gcc #7 33,108 994 13.87 C gcc 29,692 822 13.91 C gcc #3 29,840 763 13.99 C gcc #9 32,904 694 16.03 C gcc #2 1,040 400 25.30 pidigits source mem gz cpu Rust #4 2,624 799 0.71 C gcc 2,648 452 0.73 C gcc #2 2,920 416 0.74 Rust #2 2,924 1306 0.74 Rust 2,928 1420 0.74 Rust #3 2,960 1366 0.83 regex-redux source mem gz cpu Rust #6 153,148 986 1.79 Rust #5 202,556 771 1.83 Rust 152,864 804 1.83 Rust #4 202,612 765 1.87 Rust #3 203,408 719 1.89 Rust #2 152,172 701 1.89 Rust #7 147,360 2458 1.99 C gcc #5 152,220 1397 2.02 C gcc #2 103,084 1115 3.23 C gcc #4 152,056 1230 3.24 C gcc #3 103,540 1266 3.31 fasta source mem gz cpu C gcc #9 1,256 1463 0.78 C gcc #5 1,052 1281 1.30 Rust #7 2,052 2529 1.52 Rust #3 1,104 1233 2.03 C gcc #8 1,044 1293 2.74 C gcc #6 2,140 1930 2.76 C gcc #4 1,020 1240 3.06 Rust #5 2,580 1961 3.10 Rust #2 2,580 1906 3.18 C gcc #2 2,860 2268 3.25 C gcc #7 2,864 2011 3.28 Rust #8 2,596 1946 3.55 Rust #4 123,860 939 3.57 Rust #6 123,848 955 3.58 C gcc 1,016 1206 3.67 Rust 1,100 1237 4.45 C gcc #3 972 819 4.49 k-nucleotide source mem gz cpu Rust #7 131,236 1578 9.12 Rust #8 137,632 1543 10.39 Rust #6 159,088 1691 10.68 Rust #5 133,912 1739 12.23 C gcc 130,156 1506 12.31 Rust #2 137,896 1347 16.27 Rust #9 134,732 1841 18.77 Rust #4 136,216 1749 19.31 Rust 152,220 1078 70.04 reverse-complement source mem gz cpu C gcc #7 499,132 1965 0.57 Rust 499,068 3040 0.76 C gcc #8 499,184 1627 0.77 C gcc #6 688,416 820 1.27 Rust #2 995,032 1330 1.36 C gcc #5 994,088 647 1.42 C gcc #2 994,152 750 1.45 Rust #3 995,032 1097 1.52 C gcc #4 500,416 709 3.49 binary-trees source mem gz cpu Rust #5 198,536 765 3.60 Rust #2 200,024 721 4.17 C gcc #2 168,384 809 4.32 Rust #4 181,444 756 4.40 C gcc #3 134,068 836 4.71 Rust #3 163,904 754 4.87 Rust 132,604 751 7.70 C gcc 263,664 654 22.16 C gcc #5 351,304 908 32.02 Rust rustc 1.60.0 (7737e0b5c 2022-04-04) LLVM version: 14.0.0 C gcc 11.2.0-19ubuntu1 all Rust programs & measurements all C gcc programs & measurements