OCaml versus Java fastest programs Always look at the source code. These are only the fastest programs. Look at the other programs. They may seem more-like a fair comparison to you. pidigits source secs mem gz busy cpu load OCaml 1.76 6,056 593 1.98 100% 6% 3% 4% Java 1.83 34,848 764 1.95 99% 1% 4% 2% n-body source secs mem gz busy cpu load OCaml 21.67 1,368 1251 23.26 3% 1% 100% 4% Java 21.85 34,112 1489 22.16 1% 0% 0% 100% fannkuch-redux source secs mem gz busy cpu load OCaml 16.37 19,584 1004 65.39 100% 100% 100% 100% Java 16.12 33,168 1282 63.71 100% 98% 99% 98% reverse-complement source secs mem gz busy cpu load OCaml 3.74 33,944 1368 8.90 62% 58% 60% 59% Java 3.27 714,144 2183 7.54 47% 60% 66% 58% binary-trees source secs mem gz busy cpu load OCaml 9.89 152,992 751 28.64 49% 64% 98% 79% Java 8.28 948,040 835 28.20 80% 84% 87% 90% mandelbrot source secs mem gz busy cpu load OCaml 14.02 5,048 717 55.89 99% 100% 100% 100% Java 6.84 76,008 796 26.90 99% 98% 98% 98% k-nucleotide source secs mem gz busy cpu load OCaml 21.32 255,548 1833 59.79 91% 48% 100% 42% Java 9.14 403,576 1812 29.10 87% 72% 74% 86% regex-redux source secs mem gz busy cpu load OCaml 25.23 901,944 637 27.09 4% 1% 100% 3% Java 10.27 635,500 740 29.42 74% 81% 55% 76% fasta source secs mem gz busy cpu load OCaml 6.00 199,124 1189 6.32 100% 1% 1% 4% Java 2.22 43,096 2473 6.10 67% 83% 45% 80% spectral-norm source secs mem gz busy cpu load OCaml 15.70 3,704 377 16.86 100% 3% 5% 0% Java 4.15 36,428 950 16.26 98% 100% 98% 97% OCaml The OCaml native-code compiler, version 4.10.0 Java openjdk 14 2020-03-17 OpenJDK Runtime Environment (build 14+36-1461) OpenJDK 64-Bit Server VM (build 14+36-1461, mixed mode, sharing) all OCaml programs & measurements all Java programs & measurements