问题 I have large hash tables that I am writing to disk as an occasional backup. I am finding that as I map the hash tables and write to a file, the RAM usage skyrockets compared to the size of the hash. I am running lisp on emacs with slime and sbcl 2.0.3.176. System is Ubuntu 19.10 on a dell server. Data is multiple levels of hash tables. The basic structure of it is: customer-ht - hash table of structs called customer, keyed on lists of integers, like (1 2), (1 3) (defstruct customer (var1 0)