let me ask you for help. I need some explanation or analyzis how MT in 7zip works. I tried analyze and debug the source code but without any bigger success.(i have no problem with pbzip2,mpibzip2,pxz, pigz,pixz...)
Is on web any detailed analysis how it works? I found some informations but they didn't help me to understand how it works.
If i use 1- 2(3) threads the algorithm compress whole block. If i use 4+ threads the input is splited into chunk and compression have worse ratio.
lzma/lzma2 use 3 threads for one block:
1) lz-match-hash - it's small task
2) lz-match-find - it's main and slow task
3) optimal parsing and encoding.

Thank you for your help!!