Re: help with dynamic-space-size

On Mon, Feb 2, 2026 at 9:04 PM André A. Gomes <[email protected]> wrote:
>
> Greg Bennett <[email protected]> writes:
>
> > Thanks for this Andre'.   emacs tells me
> >
> > user-init-file is a variable defined in ‘C source code’.
> >
> > Its value is "/home/gwbennett/.emacs.d/init.el"
> >
> > Here are its current contents:
> > (load (expand-file-name "~/quicklisp/slime-helper.el"))
> > (setq inferior-lisp-program "sbcl --dynamic-space-size 3072")
> >
> > Starting emacs and evaluating (/ (dynamic-space-size) (expt 1024 3)) returns 1
> > rather than 3
>
> Perhaps the issue is inferior-lisp-program doesn't handle CLI options
> gracefully.
>
> Try setting slime-lisp-implementations as below:
>
> (setq slime-lisp-implementations `((my-sbcl ("sbcl" "--dynamic-space-size" "3072"))))
>
> Then you should be able to choose the my-sbcl implementation when
> issuing the slime command from Emacs.  The command may require a prefix
> arg, I can't be precise since I use SLY instead of Slime (just use
> Emacs' describe-symbol command to inspect the slime command).
>
> By the way, another way to achieve this goal is to add the following to
> your .sbclrc file.
>
> --8<---------------cut here---------------start------------->8---
> ;; An alternative to starting sbcl via sbcl --dynamic-space-size <megabytes>.
>
> (sb-alien:define-alien-variable
>     ("dynamic_space_size" *sbcl%dynamic-space-size*)
>   sb-alien:unsigned)
>
> (defconstant +MB+ (expt 1024 2))
>
> (setf *sbcl%dynamic-space-size* (* 3072 +MB+))
> --8<---------------cut here---------------end--------------->8---

That's the worst thing you can do. Not sure if you're actually joking.


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