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 5.31 793,572 929 17.50 79% 78% 83% 89% mandelbrot source secs mem gz busy cpu load Julia 1.32 227,836 624 4.66 98% 86% 85% 85% Java 4.12 70,952 796 16.22 98% 98% 98% 99% n-body source secs mem gz busy cpu load Julia 4.05 218,740 1111 4.36 3% 2% 3% 100% Java 6.77 35,432 1489 6.82 100% 1% 0% 0% spectral-norm source secs mem gz busy cpu load Julia 1.11 182,068 429 3.74 80% 79% 80% 98% Java 1.58 39,408 756 5.97 94% 94% 96% 94% fannkuch-redux source secs mem gz busy cpu load Julia 7.64 206,244 1067 28.95 95% 95% 94% 95% Java 10.38 35,388 1282 40.84 99% 99% 98% 97% fasta source secs mem gz busy cpu load Julia 1.12 193,924 1082 1.40 10% 8% 99% 8% Java 1.19 44,740 2543 3.50 75% 63% 87% 70% reverse-complement source secs mem gz busy cpu load Julia 1.60 677,796 522 1.91 6% 6% 100% 9% Java 1.53 687,864 2183 3.50 80% 46% 57% 46% pidigits source secs mem gz busy cpu load Julia 0.97 172,908 506 1.24 10% 98% 10% 9% Java 0.93 36,088 764 0.97 4% 0% 1% 99% k-nucleotide source secs mem gz busy cpu load Julia 5.12 374,876 951 11.36 63% 72% 38% 49% Java 4.85 354,288 1812 15.92 80% 85% 87% 76% binary-trees source secs mem gz busy cpu load Julia 7.43 482,620 634 23.65 69% 100% 78% 72% Java 2.48 1,725,776 835 7.86 74% 75% 97% 72% Julia julia version 1.6.0 Java openjdk 17 2021-09-14 OpenJDK Runtime Environment (build 17+35-2724) OpenJDK 64-Bit Server VM (build 17+35-2724, mixed mode, sharing) all Julia programs & measurements all Java programs & measurements