On Mon, Dec 22, 2014 at 3:25 AM, Mark Lee <mark@xxxxxxxxxxxx> wrote: > Now that xz is multithreaded (not available in Arch Repos yet); I was > wondering if package building and installing would, by default, > utilize multiple threads. It won't, since the output of XZ in multi-threaded mode is different from single-threaded mode. This will break anything relying on getting repeatable output from compression. I'm not even sure it's possible to run XZ in multi-threaded mode with a single thread. xz -T1 uses single-threaded mode. xz -T1 --block-size=24M is also different from xz -T2 --block-size=24M. Multi-threaded decompression also requires a stream created using multi-threaded mode.
