Haskell GHC versus OCaml fastest programs Always look at the source code. These are only the fastest programs. Do some of them use manually vectorized SIMD? Look at the other programs. They may seem more-like a fair comparison to you. mandelbrot source secs mem gz busy cpu load Haskell GHC 1.51 37,504 1975 5.98 99% 99% 99% 99% OCaml 7.53 4,480 717 30.02 100% 100% 100% 100% fasta source secs mem gz busy cpu load Haskell GHC 0.88 7,628 1882 3.32 94% 96% 93% 93% OCaml 3.28 203,300 1189 3.29 0% 0% 100% 0% spectral-norm source secs mem gz busy cpu load Haskell GHC 1.47 3,964 987 5.71 97% 97% 97% 97% OCaml 5.36 3,448 377 5.36 0% 0% 0% 100% regex-redux source secs mem gz busy cpu load Haskell GHC 1.07 345,128 2213 2.47 59% 44% 44% 83% OCaml 2.37 510,132 647 4.12 72% 1% 100% 1% pidigits source secs mem gz busy cpu load Haskell GHC 0.83 6,056 928 0.84 0% 99% 1% 1% OCaml 0.89 5,968 593 0.90 0% 0% 1% 100% n-body source secs mem gz busy cpu load Haskell GHC 6.42 4,176 1883 6.47 0% 0% 0% 100% OCaml 6.70 1,468 1251 6.70 100% 0% 0% 0% binary-trees source secs mem gz busy cpu load Haskell GHC 5.02 449,868 811 18.05 90% 85% 93% 91% OCaml 4.68 152,716 751 13.23 78% 99% 42% 64% fannkuch-redux source secs mem gz busy cpu load Haskell GHC 9.95 3,764 1113 39.18 95% 100% 99% 100% OCaml 8.66 18,900 1004 34.60 100% 100% 100% 100% k-nucleotide source secs mem gz busy cpu load Haskell GHC 22.02 638,132 1486 85.78 97% 99% 97% 97% OCaml 15.09 255,396 1833 40.72 38% 94% 64% 74% reverse-complement source secs mem gz busy cpu load Haskell GHC 3.36 501,696 1041 3.97 6% 100% 6% 6% OCaml 1.68 34,024 1368 4.31 56% 57% 75% 69% Haskell GHC The Glorious Glasgow Haskell Compilation System, version 9.0.1 OCaml The OCaml native-code compiler, version 4.12.0 all Haskell GHC programs & measurements all OCaml programs & measurements