This document describes how e#cient, scalable persistence  has been transparently added to the Mjølner System (MS) by changing  the generational garbage collector to identify and remove persistent  objects from memory onto persistent storage, while hardware support  has been utilized to load persistent objects on demand. MS supports  development of programs written in BETA, which are statically typed,  garbage collected and compiled into binary machine code. The changes  introduced to support persistence have not affected the size, layout or  handling of non-persistent objects