LZMA2 is used by 7-zip (multithread option is used by default).
LZMA-MT is used by FreeArc (FreeArc LZMA with 4x4 option, literally multithreaded. It will utilize max 16 CPU threads).
As for LZMA2 (it is basically just a predefined config name), you can read possible options somewhere on the 7-zip page I guess.
For the LOLZ_* names: These are just predefined configurations. FreeArc will read LOLZ as follows:
Where {:options} includes all valid options for this compressor.
So the preset "LOLZ_NORMAL" is just this:
Code:
lolz:d<expr:((0.45*freememory/11)-(32*1048576*2))/min(thread,16)/1048576>:mtt1:mt<expr:min(thread,16)>:mc1023
DSG reads your aviable free RAM and replace the :d option in lolz, same for the :mt option, just with your max CPU threads.
However you can write your own options if you want. lolz options can be read in english in the following folder "Resources\FINAL\LOLZ\Options.txt"