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. mandelbrot source secs mem gz busy cpu load Haskell GHC 1.47 38,268 1975 5.82 99% 100% 99% 99% C clang 2.09 31,812 694 8.34 100% 100% 100% 100% pidigits source secs mem gz busy cpu load Haskell GHC 0.75 5,992 1694 0.76 0% 0% 1% 100% C clang 0.73 2,820 416 0.72 0% 99% 0% 0% fannkuch-redux source secs mem gz busy cpu load Haskell GHC 10.22 3,620 1113 40.23 100% 100% 95% 99% C clang 9.85 964 1557 37.34 90% 95% 93% 100% fasta source secs mem gz busy cpu load Haskell GHC 0.88 7,948 1882 2.87 81% 82% 81% 81% C clang 0.82 3,816 2268 3.26 99% 99% 100% 100% regex-redux source secs mem gz busy cpu load Haskell GHC 0.97 308,028 2213 2.31 64% 46% 81% 47% C clang 0.82 154,084 1397 2.80 82% 83% 79% 96% spectral-norm source secs mem gz busy cpu load Haskell GHC 1.48 4,044 987 5.71 96% 96% 97% 96% C clang 0.72 3,056 1139 2.87 100% 100% 100% 100% n-body source secs mem gz busy cpu load Haskell GHC 6.95 4,196 1883 26.83 95% 95% 95% 100% C clang 3.33 8 1391 3.46 1% 2% 1% 100% binary-trees source secs mem gz busy cpu load Haskell GHC 4.11 519,284 811 15.16 92% 89% 91% 97% C clang 1.92 169,416 809 6.15 77% 79% 72% 93% reverse-complement source secs mem gz busy cpu load Haskell GHC 2.95 501,572 1020 3.51 6% 6% 6% 100% C clang 0.99 741,472 820 3.94 100% 100% 99% 100% k-nucleotide source secs mem gz busy cpu load Haskell GHC 20.01 522,656 1059 73.95 90% 91% 95% 94% C clang 6.01 128,788 1506 12.85 24% 44% 54% 92% Haskell GHC The Glorious Glasgow Haskell Compilation System, version 8.10.1 C clang Ubuntu clang version 11.0.0-2 all Haskell GHC programs & measurements all C clang programs & measurements