Intel Fortran versus C gcc 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 Intel Fortran 1.42 36,184 957 5.63 99% 100% 99% 99% C gcc 1.27 31,792 1135 5.08 100% 100% 99% 100% regex-redux source secs mem gz busy cpu load Intel Fortran 0.99 176,200 2225 3.06 68% 73% 71% 98% C gcc 0.80 152,172 1397 2.01 52% 99% 48% 53% pidigits source secs mem gz busy cpu load Intel Fortran 0.74 4,004 981 0.75 0% 0% 100% 1% C gcc 0.59 2,444 1090 2.37 100% 100% 100% 98% fannkuch-redux source secs mem gz busy cpu load Intel Fortran 10.16 11,048 1158 40.55 100% 100% 100% 100% C gcc 7.58 872 910 29.61 100% 98% 99% 93% binary-trees source secs mem gz busy cpu load Intel Fortran 2.38 133,752 1148 7.45 100% 70% 70% 73% C gcc 1.54 168,832 809 4.35 60% 67% 57% 100% spectral-norm source secs mem gz busy cpu load Intel Fortran 0.72 1,776 638 2.85 100% 100% 99% 99% C gcc 0.40 872 1197 1.58 100% 100% 100% 98% n-body source secs mem gz busy cpu load Intel Fortran 4.22 12 1524 4.34 100% 1% 1% 2% C gcc 2.18 768 1633 2.19 0% 100% 0% 0% fasta source secs mem gz busy cpu load Intel Fortran 2.06 12 1351 2.06 0% 0% 0% 100% C gcc 0.78 1,156 1463 0.78 0% 0% 0% 100% reverse-complement source secs mem gz busy cpu load Intel Fortran 3.90 985,352 1019 4.11 1% 100% 4% 1% C gcc 0.86 712,208 820 1.27 99% 28% 1% 19% k-nucleotide source secs mem gz busy cpu load Intel Fortran Make Error C gcc 3.72 130,260 1506 12.07 100% 89% 78% 57% Intel Fortran Intel(R) Fortran Intel(R) 64 Compiler for applications runn304 Build 20200925_0ing on Intel(R) 64, Version 19.1.3.304 Build 20200925_000000 Copyright (C) 1985-2020 Intel Corporation. All rights reserved. FOR NON-COMMERCIAL USE ONLY C gcc gcc (Ubuntu 10.3.0-1ubuntu1) 10.3.0 all Intel Fortran programs & measurements all C gcc programs & measurements