Scieneer Common Lisp 1.3.9 online documentation

ext:purify &key root-structures environment-name[Function]

This function optimizes garbage collection by moving all currently live objects into non-collected storage. root-structures is an optional list of objects which should be copied first to maximize locality.

environment-name is gratuitous documentation for compacted version of the current global environment (as seen in c::*info-environment*.) If nil is supplied, then environment compaction is inhibited.