Is it possible to use the multithreaded compression built into xz 5.2+ on macos? Currently using homebrew xz 5.2.3 on macos 10.12.3 with a hyperthreaded quadcore cpu and no matter my setting for number of threads in xz the compression time is always the exact same:
time xz -9vfT0 test.tar -> real 2m2.753s
time xz -9vfT8 test.tar -> real 2m1.113s
time xz -9vfT4 test.tar -> real 2m1.034s