libera/#lisp - IRC Chatlog

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21:08:56 sonny Did the first lisp have a garbage collector?

21:11:02 aap LISP 1 did, yes

21:14:00 sonny ah neat

21:14:20 sonny what changed when virtual memory came around?

21:15:30 aap what do you mean what changed?

21:17:17 pjb sonny: VM is managed by the OS. The user space programs may just take the behavior of the VM into account to avoid bad performance. Mostly, by avoiding to scan the whole addressing space while GCing. Hence the introduction of new algorithms, such as generationnal GCs.

21:18:01 pjb (well, with VM, memory can also be allocated and deallocated page by page at specific addresses instead of heap/stack fashion, so this can help).

21:19:25 sonny pjb: that makes sense, thanks

21:19:26 pjb sonny: note: GC was invented for lisp. As well as timesharing (for the REPLs), and stacks (fortran didn't have stack so no recursive functions).

21:20:01 sonny gc for stacks?

21:20:26 pjb The stacks is part of the root set for GC.

21:20:34 sonny ok

21:20:57 sonny seems so advanced

21:21:16 pjb If you don't have recursive functions, you don't need a call stack with function parameters. Instead, you can just store the parameters in a specific record for each function.

21:21:31 pjb And store the return addresses in those records!

21:21:50 pjb Yeah, lisp inventors were smart and advanced.

21:21:59 pjb They were working in the MIT AILab!

21:22:00 APic True

21:22:17 sonny Do even need a record? They are just label + ret

21:22:45 pjb Yes. I use the term generically.

21:22:51 sonny oh ok

21:23:06 sonny yeah, MIT continues to amaze me

21:23:19 pjb Have fun! Good night!

21:23:26 sonny thanks, gn

21:43:27 Lord_of_Life_ ** NICK Lord_of_Life