#1557 Add the switch that allows you not to buffer the data.

[Riccardo La Marca]

I am going to show the percentage of completion of the file transfer, only since the buffer is active, that percentage will reach 100%, in my case, over 15 minutes before the files are actually written to disk. The size of my archive is over 4GB.
I need a switch that allows me to write files directly to disk, without going through the buffer.

7z x "$device" -o"$mountpoint" -bsp2 > /dev/null

[Igor Pavlov]

-mmt1

[Riccardo La Marca]

And what does multitreading have to do with buffering?

[Igor Pavlov]

7-zip uses many threads to decompress lzma2 blocks to buffer, and then it writes data from buffer to to file.
-mmt1 disables that multithreading code.
It's so for 7z/lzma2 anx xz archives.
Another archive types don't use multithreading for decompression.

[Riccardo La Marca]

-mmt1 doesn't work, as the next sync command still takes the same long time to empty the buffer.

[Igor Pavlov]

What archive type and compression method?

7z l a.7z > list.txt