OCaml versus Java 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 OCaml #3 8.94 19,796 1024 35.72 OCaml #4 8.93 19,796 1018 35.73 Java #3 40.76 42,844 1264 40.83 Java 10.98 42,812 1289 43.36 Java #2 44.03 40,916 520 44.09 OCaml #2 46.91 19,668 478 46.91 OCaml 51.57 19,668 529 51.57 n-body source secs mem gz cpu secs Java #5 6.78 41,384 1435 6.82 OCaml 6.83 19,688 1255 6.83 Java #4 6.87 41,188 1495 6.91 Java #2 7.42 41,308 1430 7.46 Java #3 7.47 41,256 1436 7.51 Java 7.85 41,512 1437 7.89 spectral-norm source secs mem gz cpu secs OCaml #2 5.31 19,688 383 5.31 Java #3 1.66 42,924 762 6.21 Java 7.07 42,268 521 7.13 Java #2 2.40 42,164 956 9.25 mandelbrot source secs mem gz cpu secs Java #4 4.45 104,488 667 16.20 Java #2 4.13 83,152 802 16.22 Java #6 4.28 83,056 808 16.84 Java 25.70 41,388 671 25.76 OCaml #6 28.68 19,688 450 28.68 OCaml 7.55 19,812 723 30.02 Java #3 7.86 83,424 910 30.96 pidigits source secs mem gz cpu secs Java #3 0.93 40,860 770 0.96 Java #2 1.34 44,524 944 1.42 OCaml #5 2.86 19,508 465 2.86 Java 7.61 486,236 807 8.69 OCaml #7 Make Error regex-redux source secs mem gz cpu secs OCaml #2 13.51 922,760 644 13.51 Java 8.38 666,804 875 16.42 Java #3 5.17 671,372 935 17.04 Java #6 5.57 1,234,928 746 17.17 OCaml #3 Make Error fasta source secs mem gz cpu secs Java #4 3.15 42,784 1528 3.26 OCaml #6 3.36 201,856 1194 3.36 Java #6 1.18 48,408 2549 3.71 Java #5 1.24 48,752 2478 3.81 Java #2 4.35 47,184 1259 4.50 OCaml #3 4.66 19,796 1075 4.66 k-nucleotide source secs mem gz cpu secs Java 5.01 368,104 1821 16.33 Java #6 7.18 365,592 1614 25.01 Java #3 7.30 365,348 1642 25.39 Java #4 34.43 195,584 1887 34.79 Java #5 16.05 219,872 2225 38.17 OCaml #3 15.81 258,380 1839 42.53 OCaml 43.82 338,264 894 43.81 OCaml #2 26.57 314,252 1247 60.40 reverse-complement source secs mem gz cpu secs Java #6 3.33 2,031,460 760 3.96 Java #5 4.73 1,096,344 1115 4.86 OCaml 2.23 19,816 1372 5.42 Java #4 5.57 1,889,928 656 5.68 OCaml #3 2.28 19,816 1361 6.06 Java #7 23.06 1,036,296 1654 6.31 OCaml #2 9.26 888,064 426 9.26 Java #3 Bad Output Java #8 Bad Output binary-trees source secs mem gz cpu secs Java #4 4.50 2,081,744 846 5.22 Java #3 4.80 2,076,860 546 5.59 Java #6 4.84 2,097,072 535 5.60 Java #2 4.93 2,067,656 558 5.67 Java #7 2.57 1,728,452 841 8.00 OCaml #5 8.18 213,760 468 8.17 OCaml #2 3.42 217,384 759 9.63 OCaml OCaml native-code version 5.1.1 Java java 22 2024-03-19 Java HotSpot(TM) 64-Bit Server VM (build 22+36-2370, mixed mode, sharing) all OCaml programs & measurements all Java programs & measurements