I tried different version of srep to compress the game but still it needs around 15gb of ram to decompress how the repwck of fitgirl which i am heaving needs only 6gb of ram.
that means if i put limit of ram to 2gb, it will create a temp file of 13gb.
any idea how can i optimize srep ram usage during decompression.

well srep is the same as the one from ProFrager (the new ver) if you have enough RAM like 21.5gb it still well create 5gb of temp file...
game size 32gb but as you see in the picture before and after there is 37gb of data has been written to the drive and the memory usage for srep around 21341mb

well the second repack of fitgirl uses that much ram but the first repack the 4.1gb one uses only 7gb and in this repack she has uses cls-srep.dll 86kb.
not this cls

@ZakirAhmad
hey you should add memory expection in srep like this srep:mem256mb+lolz
it means only 256mb will need for memory and remaining will go to the virtual file

the idea was to limit tmp file creation and minimum memory usage while maintaining the sMe compression ratio and i did this by using parameter m2f. it only needs 2.2gb of ram and has almost sMe ratio.