Remember 2006 ? You know, back when Twitter was a new thing :-) Back then you couldn't buy machines with 1TB of RAM, most systems were 32bit and limited to ab

Remember 2006 ? You know, back when Twitter was a new thing :-) Back then you couldn't buy machines with 1TB of RAM, most systems were 32bit and limited to about 3GB usable RAM. Varnish was written with 64bit in mind from the start, but it also had to work on 32 bit systems, so we had to be able to use disk-backed VM to get past a couple of GB.