By default, all new objects are allocated to a specific generation. This function returns the current value of this default generation.
allocation-in-gen-num
clean-generation-0
collect-generation-2
collect-highest-generation
expand-generation-1
set-default-generation
*symbol-alloc-gen-num*
Memory Management in 32-bit LispWorks
LispWorks User Guide and Reference Manual - 20 Sep 2017