Re: Larger GC thresholds for non-interactive Emacs

[Lars Ingebrigtsen]

I tried this very advanced patch:

diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index d28ec0be16..1bd0793097 100644
--- a/lisp/emacs-lisp/bytecomp.el
+++ b/lisp/emacs-lisp/bytecomp.el
@@ -5366,6 +5366,7 @@ batch-byte-compile
   ;; behavior.
   (setq attempt-stack-overflow-recovery nil
         attempt-orderly-shutdown-on-fatal-signal nil)
+  (setq gc-cons-threshold (* 100 gc-cons-threshold))
   (let ((error nil))
     (while command-line-args-left
       (if (file-directory-p (expand-file-name (car command-line-args-left)))

A "make -j32 bootstrap" went from 1m25s to 1m6s.  😀

Most of this time is spent doing other things than building lisp files,
though, so the impact on byte compilation is huge.

rm lisp/*/*.elc
time make -j32

goes from 29s to 14s.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no