Fastest cpu secs Java versus C++ g++ 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++ g++ #6 2,000 1528 12.93 C++ g++ #7 992 1150 13.89 C++ g++ #5 2,000 980 29.40 C++ g++ #4 2,216 1439 40.52 C++ g++ #3 988 593 40.55 Java #3 35,324 1257 41.17 Java 35,824 1282 41.74 C++ g++ #2 2,224 1440 42.64 C++ g++ 2,164 1059 42.76 Java #2 34,244 514 44.98 n-body source mem gz cpu C++ g++ #0 964 1927 2.17 C++ g++ #2 1,944 1879 4.06 C++ g++ #7 1,976 1808 4.28 C++ g++ #9 1,260 1530 4.90 C++ g++ #6 1,300 1668 5.65 C++ g++ #4 1,040 1428 5.68 C++ g++ #3 1,280 1396 5.74 C++ g++ 1,260 1659 5.93 C++ g++ #8 1,220 1517 6.08 C++ g++ #5 1,944 1749 6.11 Java #5 34,252 1429 6.79 Java #4 34,076 1489 6.79 Java #3 34,612 1430 7.50 Java #2 34,704 1424 7.50 Java 37,380 1430 7.83 spectral-norm source mem gz cpu C++ g++ #6 1,348 1044 2.85 C++ g++ #5 2,048 1044 5.26 C++ g++ 1,964 452 5.36 Java #3 38,428 756 5.94 C++ g++ #8 1,348 1278 6.09 Java 37,288 514 9.76 Java #2 37,368 950 10.07 mandelbrot source mem gz cpu C++ g++ #4 34,720 3542 3.27 C++ g++ 32,336 1791 3.48 C++ g++ #6 31,792 1002 3.88 C++ g++ #0 34,712 2739 4.06 C++ g++ #8 34,448 742 13.19 C++ g++ #5 33,640 590 13.37 C++ g++ #9 34,428 726 13.48 C++ g++ #7 34,392 1017 13.92 Java #4 66,304 660 16.16 Java #2 68,860 796 16.21 Java #6 67,432 802 16.92 C++ g++ #2 34,176 692 17.47 Java 34,252 665 27.75 C++ g++ #3 1,976 414 28.53 Java #3 69,200 903 29.18 pidigits source mem gz cpu C++ g++ #4 4,220 513 0.71 C++ g++ #5 4,284 798 0.72 Java #3 35,700 764 0.82 Java #2 38,328 938 1.53 Java 513,728 800 8.94 regex-redux source mem gz cpu C++ g++ #6 275,924 2850 2.20 C++ g++ #4 203,888 1315 3.39 C++ g++ 207,788 656 3.57 C++ g++ #2 198,316 700 3.69 C++ g++ #5 214,888 852 4.28 Java 924,116 868 17.12 Java #6 728,332 740 17.16 Java #3 741,028 929 17.34 C++ g++ #3 217,248 853 18.28 fasta source mem gz cpu C++ g++ #8 2,720 2751 1.52 C++ g++ #2 2,004 1127 1.85 C++ g++ 2,000 1057 1.97 C++ g++ #3 1,964 1307 2.62 C++ g++ #4 1,016 1287 3.36 Java #4 36,800 1524 3.41 Java #6 42,416 2543 3.52 C++ g++ #5 4,540 2344 3.75 C++ g++ #6 4,564 2324 3.89 Java #5 42,532 2473 4.14 Java #2 36,812 1257 4.46 C++ g++ #7 Make Error k-nucleotide source mem gz cpu C++ g++ #2 156,416 1631 5.92 C++ g++ #3 165,588 1276 14.14 C++ g++ 756,320 1446 14.54 Java 349,544 1812 16.17 Java #6 343,684 1607 25.67 Java #3 344,652 1635 25.73 Java #4 199,824 1882 37.48 Java #5 210,368 2219 43.27 reverse-complement source mem gz cpu C++ g++ #2 499,708 2093 0.64 C++ g++ #3 500,008 840 2.62 Java #8 665,804 2183 3.49 C++ g++ #6 1,513,136 1832 4.00 Java #6 2,024,016 752 4.15 Java #5 1,088,392 1108 4.92 Java #3 1,170,232 1722 5.09 Java #4 1,881,900 651 5.41 C++ g++ 979,988 592 6.34 Java #7 1,030,892 1647 23.16 C++ g++ #5 765,148 720 34.88 binary-trees source mem gz cpu C++ g++ #7 168,192 890 3.38 C++ g++ #5 200,020 885 4.10 C++ g++ #9 135,652 809 4.16 C++ g++ #3 265,220 945 4.65 C++ g++ #6 265,784 844 4.72 C++ g++ #8 265,808 820 5.05 Java #3 2,106,820 540 5.19 Java #6 2,093,916 529 5.35 Java #4 2,079,388 840 5.44 Java #2 1,877,464 552 5.45 Java #7 2,460,388 835 7.73 C++ g++ 1,947,704 754 8.99 C++ g++ #2 265,180 508 22.61 C++ g++ #4 Make Error Java openjdk 18 2022-03-22 OpenJDK Runtime Environment (build 18+36-2087) OpenJDK 64-Bit Server VM (build 18+36-2087, mixed mode, sharing) C++ g++ 11.2.0-19ubuntu1 all Java programs & measurements all C++ g++ programs & measurements