On 2016-10-06 02:50:00 [+0000], HW42 wrote: > Is the new multi-thread compressor reproducible? I.e. does it produce > the same output regardless of the number of CPUs, the CPU speed, system > load, etc.? (A very quick look at the source suggest that this is not > the case but I might be totally mistaken)
With one CPU you have one block. With multiple CPUs the default block size (as of current xz) is dictionary size * three. So it is reproducible as long as you use one or multiple CPUs. In order to have the same compressed archive with one or multiple CPUs you would need a switch / environment variable to disable the use of multiple CPUs. Sebastian
