Benchmarking CPUs with xz

Test file: http://mattmahoney.net/dc/enwik9.zip enwik9.zip

xz for Windows: https://tukaani.org/xz/ xz-5.2.4-windows.zip

Procedure:

1. Extract above file
2. Single-threaded test:
   1. *nix/WSL: time xz -k -T1 enwik9
   2. Windows: Measure-Command { .\xz.exe -k -T1 .\enwik9 }
3. All threads test: (rm enwiki9.xz first!)
   1. *nix/WSL: time xz -k -T0 enwik9
   2. Windows: Measure-Command { .\xz.exe -k -T0 .\enwik9 }

Multi-testing:

time xz -k enwik9 -T0 ; rm enwik9.xz ; time xz -k enwik9 -T 12 ; rm enwik9.xz ; time xz -k enwik9 -T1 ; rm enwik9.xz