Just in case you were wondering what am FCGI-wrapped lua with JSON, PCRE, and Postgresql libraries looked like from a memory perspective:

> ps -C lua5.1 v
  PID TTY      STAT   TIME  MAJFL   TRS   DRS   RSS %MEM COMMAND
25751 ?        S      0:00      8   134  8453  2872  0.2 lua5.1 /usr/bin/wsapi.fcgi