"Each tor process consumes ~ 6 Mb of Ram. 6x8 = 48 ~ 64
Mb of RAM for Tor processes. Privoxy eats about 2 Mb each. 2x8 = 16
~ 32 Mb of RAM. So, 128 Mb of RAM will be enough for Tor and
Privoxy processes. Squid-in will have memory footprint approx 128
Mb. We assume it eats 256 Mb. Same for Squid-out. We got 768 Mb of
RAM total required. If it is gonna be a real system - we assume 1
Gb hardware RAM installed."