Julia 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. n-body source secs mem gz busy cpu load Julia 4.00 212,108 1112 4.30 99% 3% 3% 3% C gcc 4.30 8 1391 4.32 0% 0% 0% 100% fannkuch-redux source secs mem gz busy cpu load Julia 7.96 197,292 1067 30.06 94% 95% 94% 94% C gcc 7.52 836 910 29.37 99% 100% 93% 99% mandelbrot source secs mem gz busy cpu load Julia 1.38 235,276 621 4.78 83% 83% 83% 99% C gcc 1.27 31,692 1135 5.08 100% 100% 100% 99% k-nucleotide source secs mem gz busy cpu load Julia 4.66 360,436 945 10.68 39% 52% 53% 85% C gcc 3.81 130,112 1506 12.18 54% 87% 79% 100% pidigits source secs mem gz busy cpu load Julia 1.00 168,088 506 1.31 11% 99% 11% 10% C gcc 0.73 2,848 416 0.75 1% 100% 1% 0% spectral-norm source secs mem gz busy cpu load Julia 1.23 180,836 521 3.87 73% 71% 91% 80% C gcc 0.72 1,100 569 2.86 100% 99% 100% 100% reverse-complement source secs mem gz busy cpu load Julia 1.50 671,028 522 1.77 7% 9% 96% 7% C gcc 0.86 698,264 820 1.27 1% 18% 100% 28% regex-redux source secs mem gz busy cpu load Julia 1.75 384,588 759 3.10 6% 67% 93% 12% C gcc 0.80 152,196 1397 2.03 48% 100% 54% 53% fasta source secs mem gz busy cpu load Julia 1.72 354,912 1182 4.90 79% 75% 63% 69% C gcc 0.78 1,220 1463 0.79 1% 0% 0% 100% binary-trees source secs mem gz busy cpu load Julia 9.67 604,312 372 29.97 75% 84% 72% 78% C gcc 1.79 168,760 809 5.35 64% 64% 71% 100% Julia julia version 1.5.0 C gcc gcc (Ubuntu 10.2.0-13ubuntu1) 10.2.0 all Julia programs & measurements all C gcc programs & measurements