Gerd Möllmann <gerd.moellmann@gmail.com> writes:
Just for the record, SBCL/CMUCL don't use GMP.
Hm, thinking of this - did someone measure how much time is spent in
malloc/realloc/free in the benchmarks? That is what GMP uses, and SBCL
doesn't.
https://yhetil.org/emacs-devel/87bkfdsmde.fsf@localhost/
We can further get rid of the GC by temporarily disabling it (just for
demonstration):
(let ((beg (float-time)))
(setq gc-cons-threshold most-positive-fixnum)
(fib 10000 1000)
(message "%.3f s" (- (float-time) beg)) )
perf record ~/Git/emacs/src/emacs -Q -batch -l /tmp/fib.eln
0.739 s
17.11% emacs libgmp.so.10.5.0 [.] __gmpz_sizeinbase
7.35% emacs libgmp.so.10.5.0 [.] __gmpz_add
6.51% emacs emacs [.] arith_driver
6.03% emacs libc.so.6 [.] malloc
5.57% emacs emacs [.] allocate_vectorlike
5.20% emacs [unknown] [k] 0xffffffffaae01857
4.16% emacs libgmp.so.10.5.0 [.] __gmpn_add_n_coreisbr
3.72% emacs emacs [.] check_number_coerce_marker
3.35% emacs fib.eln [.] F666962_fib_0
3.29% emacs emacs [.] allocate_pseudovector
2.30% emacs emacs [.] Flss