Ada 2012 GNAT versus C++ g++ 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. fannkuch-redux source secs mem gz busy cpu load Ada 2012 GNAT 10.23 4,332 2113 40.80 100% 100% 100% 100% C++ g++ 10.71 1,708 980 42.33 100% 96% 100% 100% pidigits source secs mem gz busy cpu load Ada 2012 GNAT 1.75 4,600 1130 1.79 0% 2% 1% 100% C++ g++ 1.82 4,312 513 1.87 1% 1% 2% 100% spectral-norm source secs mem gz busy cpu load Ada 2012 GNAT 2.00 4,248 2770 7.88 99% 98% 99% 99% C++ g++ 1.99 2,408 1044 7.89 99% 99% 99% 99% n-body source secs mem gz busy cpu load Ada 2012 GNAT 9.71 1,784 2617 9.89 1% 0% 100% 1% C++ g++ 7.70 1,612 1879 7.81 100% 0% 1% 1% reverse-complement source secs mem gz busy cpu load Ada 2012 GNAT 4.05 789,068 3283 4.64 40% 1% 72% 1% C++ g++ 1.89 499,672 2093 1.94 100% 2% 1% 1% binary-trees source secs mem gz busy cpu load Ada 2012 GNAT 9.82 202,292 2107 33.89 84% 94% 82% 85% C++ g++ 3.96 113,236 809 12.86 74% 84% 98% 69% k-nucleotide source secs mem gz busy cpu load Ada 2012 GNAT 10.22 258,500 4908 23.76 37% 19% 89% 87% C++ g++ 3.88 156,164 1631 12.09 72% 92% 71% 77% fasta source secs mem gz busy cpu load Ada 2012 GNAT 4.18 1,784 2153 4.25 95% 0% 0% 6% C++ g++ 1.46 2,024 2711 4.40 75% 76% 75% 76% mandelbrot source secs mem gz busy cpu load Ada 2012 GNAT 5.60 35,640 1819 22.24 100% 99% 99% 99% C++ g++ 1.51 26,256 1791 6.01 100% 99% 99% 99% regex-redux source secs mem gz busy cpu load Ada 2012 GNAT 7.02 154,252 3640 19.93 59% 61% 84% 79% C++ g++ 1.86 203,856 1315 4.49 99% 50% 48% 44% Ada 2012 GNAT GNATMAKE 9.3.0 gcc (Ubuntu 9.3.0-10ubuntu2) 9.3.0 C++ g++ g++ (Ubuntu 9.3.0-10ubuntu2) 9.3.0 all Ada 2012 GNAT programs & measurements all C++ g++ programs & measurements