Haskell GHC versus C clang 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. fasta source secs mem gz busy cpu load Haskell GHC 1.40 7,992 1882 4.15 75% 74% 75% 74% C clang 1.37 3,888 2268 5.46 100% 99% 99% 100% mandelbrot source secs mem gz busy cpu load Haskell GHC 4.87 36,328 1975 19.39 99% 100% 100% 99% C clang 4.46 29,404 694 17.82 100% 100% 100% 100% regex-redux source secs mem gz busy cpu load Haskell GHC 1.78 307,992 2213 4.35 79% 50% 50% 65% C clang 1.51 154,168 1230 4.99 73% 81% 78% 100% fannkuch-redux source secs mem gz busy cpu load Haskell GHC 18.37 4,352 842 72.54 96% 100% 100% 100% C clang 10.99 2,612 910 43.28 100% 100% 100% 95% spectral-norm source secs mem gz busy cpu load Haskell GHC 4.10 4,012 987 15.83 97% 97% 99% 95% C clang 1.98 3,176 569 7.92 100% 100% 99% 100% pidigits source secs mem gz busy cpu load Haskell GHC 4.22 9,964 585 5.27 8% 100% 9% 9% C clang 1.75 2,728 452 1.80 2% 1% 0% 99% binary-trees source secs mem gz busy cpu load Haskell GHC 12.96 476,448 592 47.98 92% 92% 93% 94% C clang 4.63 119,148 836 13.89 64% 66% 70% 100% reverse-complement source secs mem gz busy cpu load Haskell GHC 6.42 501,528 1020 9.38 14% 100% 16% 16% C clang 2.17 994,352 750 3.27 28% 21% 27% 75% n-body source secs mem gz busy cpu load Haskell GHC 21.87 4,364 1883 86.49 99% 100% 99% 98% C clang 6.64 8 1391 6.76 0% 1% 100% 1% k-nucleotide source secs mem gz busy cpu load Haskell GHC 35.91 637,624 1486 125.59 86% 86% 86% 91% C clang 9.41 128,752 1506 19.85 44% 32% 44% 92% Haskell GHC The Glorious Glasgow Haskell Compilation System, version 8.8.1 C clang clang version 9.0.0-2 all Haskell GHC programs & measurements all C clang programs & measurements