23bf99b8e2
According to following two benchmarks: - https://www.rootusers.com/gzip-vs-bzip2-vs-xz-performance-comparison/ - http://catchchallenger.first-world.info/wiki/Quick_Benchmark:_Gzip_vs_Bzip2_vs_LZMA_vs_XZ_vs_LZ4_vs_LZO xz has better compression ratio than bzip2 at lowest compression rate. https://github.com/vasi/pixz has been chosen as it can scale compressing over multiple cores linearly. We're using this in snabblab for a month now and it has improved CPU wise the main Hydra server.