Set the current generation for storage allocation. By default the system allocates memory from the youngest generation (generation 0).
(set-default-generation 1)
;; allocate from an
;; older generation
(set-default-generation 0)
;; return to normal
allocation-in-gen-num clean-generation-0 collect-generation-2 collect-highest-generation expand-generation-1 get-default-generation set-promotion-count *symbol-alloc-gen-num*