Helping thread :)

[Gupta]

doodoo24

your English is worse then mine

i am not stupid

may be you get me wrong, i never said u r stupid nor i think like that, what i have said is that u need some reading first, nothing else

using 4x4:lzma the cpu usage is less because there is less data write to the hdd because hdd speed 175 mb/ sec .

it is because

LZ77 decompression is extremely fast, faster than compression. The compressor
must search for matching strings, typically using a hash table or tree. The decompresser
only needs to maintain an output buffer from which to copy repeated strings, and then 
write a copy of its output to the buffer.

and LZMA is LZ77 algorithm. Moreover 4x4 can use more then one lzma instance to unpack files by making them work on seperate chunks since its very difficult for Lzma to do that alone and the most Important one, "IGOR don't want to implement it " or in his word he don't have time

Using Lzma the highest speed u can get is around 25-30 mb/s
but u r saying u r getting 175 mb/s with 4x4
this mean u r using 6 out of 8 threads of ur pc
but still saying 50% cpu usage , strange really strange