Julia versus Java 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. regex-redux source secs mem gz busy cpu load Julia 1.68 394,324 759 3.06 99% 7% 5% 71% Java 5.58 985,696 929 18.26 81% 77% 84% 85% mandelbrot source secs mem gz busy cpu load Julia 1.32 227,836 624 4.66 98% 86% 85% 85% Java 4.15 69,136 796 16.29 98% 99% 98% 99% n-body source secs mem gz busy cpu load Julia 4.05 218,740 1111 4.36 3% 2% 3% 100% Java 6.74 35,844 1489 6.82 1% 100% 1% 0% spectral-norm source secs mem gz busy cpu load Julia 1.11 182,068 429 3.74 80% 79% 80% 98% Java 1.63 39,304 756 6.22 95% 97% 95% 95% fannkuch-redux source secs mem gz busy cpu load Julia 7.64 206,244 1067 28.95 95% 95% 94% 95% Java 10.64 35,192 1282 41.91 99% 98% 99% 97% fasta source secs mem gz busy cpu load Julia 1.12 193,924 1082 1.40 10% 8% 99% 8% Java 1.21 44,620 2543 3.58 89% 75% 65% 68% k-nucleotide source secs mem gz busy cpu load Julia 5.12 374,876 951 11.36 63% 72% 38% 49% Java 4.98 356,904 1812 16.25 78% 76% 96% 76% reverse-complement source secs mem gz busy cpu load Julia 1.60 677,796 522 1.91 6% 6% 100% 9% Java 1.54 670,924 2183 3.51 46% 56% 48% 79% pidigits source secs mem gz busy cpu load Julia 0.97 172,908 506 1.24 10% 98% 10% 9% Java 0.93 36,552 764 0.98 2% 3% 1% 99% binary-trees source secs mem gz busy cpu load Julia 7.43 482,620 634 23.65 69% 100% 78% 72% Java 2.48 1,722,848 835 7.88 98% 75% 71% 74% Julia julia version 1.6.0 Java openjdk 16 2021-03-16 OpenJDK Runtime Environment (build 16+36-2231) OpenJDK 64-Bit Server VM (build 16+36-2231, mixed mode, sharing) all Julia programs & measurements all Java programs & measurements