With this commit I added 7-zip benchmark reporting to Armbian now. Will be available after next updates and with next batch of new images.
Why not recommending to just do an 'apt install p7zip ; 7zr b'? Since 'fire and forget' benchmarking is always BS. You need some monitoring in parallel to know whether your system was really idle and at which clockspeeds the CPU cores were operating (throttling occuring or not?).
Most recent 7-zip contains an own routine to 'pre-heat'