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 1.67 394,692 759 3.07 72% 99% 7% 6% Java 5.58 985,696 929 18.26 81% 77% 84% 85% mandelbrot source secs mem gz busy cpu load Julia 1.70 239,084 621 6.14 88% 87% 87% 99% Java 4.15 69,136 796 16.29 98% 99% 98% 99% n-body source secs mem gz busy cpu load Julia 4.34 226,468 1112 4.61 2% 2% 2% 100% Java 6.74 35,844 1489 6.82 1% 100% 1% 0% fannkuch-redux source secs mem gz busy cpu load Julia 7.64 205,056 1067 28.96 95% 95% 94% 95% Java 10.64 35,192 1282 41.91 99% 98% 99% 97% spectral-norm source secs mem gz busy cpu load Julia 1.47 200,604 391 4.11 99% 60% 60% 60% Java 1.63 39,304 756 6.22 95% 97% 95% 95% pidigits source secs mem gz busy cpu load Julia 0.97 173,020 506 1.27 10% 99% 11% 10% Java 0.93 36,552 764 0.98 2% 3% 1% 99% reverse-complement source secs mem gz busy cpu load Julia 1.61 677,192 522 1.89 99% 7% 6% 6% Java 1.54 670,924 2183 3.51 46% 56% 48% 79% k-nucleotide source secs mem gz busy cpu load Julia 5.37 370,020 951 12.17 26% 64% 77% 60% Java 4.98 356,904 1812 16.25 78% 76% 96% 76% fasta source secs mem gz busy cpu load Julia 1.77 372,128 1182 4.21 51% 75% 49% 63% Java 1.21 44,620 2543 3.58 89% 75% 65% 68% binary-trees source secs mem gz busy cpu load Julia 17.28 418,492 372 45.74 61% 67% 69% 69% 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