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bug#32728: Xemacs 23 times as fast as GNU Emacs

From: Benninghofen, Benjamin Dr.
Subject: bug#32728: Xemacs 23 times as fast as GNU Emacs
Date: Thu, 13 Sep 2018 08:42:32 +0000

The versions of Xemacs and GNU Emacs are those that come with RHEL 7.5.
The attachment contains 2 files:
demo.el   : to be evaluated in Emacs Lisp
prog.sh  :  to be placed in the home directory
Furthermore a large text file "input.txt"  is needed in the home directory. The file should have 1000000 lines, each line longer than 80 characters. The file is not included in the attachment because this would be too big.
The file I used was created with the following ANSI-COMMON-LISP function:
(defun print-nums (&key (first 1) (last 1000000))
  (check-type first fixnum)
  (check-type last fixnum)
  (loop for k of-type fixnum from first to last do (format t "~%~B ^3 = ~B" k (expt k 3)))
Alternatively the "input.txt" file can be created as follows:
#! /bin/bash
  function base2 {
      echo "obase=2;$1" | bc
  for k in $(seq 1 $last); do
      x=$(( k * k * k ))
      echo $(base2 $k) '^3 =' $(base2 $x)
generate the input like this:
  $ ./gen.sh > input.txt
The benchmark is executed by
(M-x) demo
At the end the time is printed and I received the following results:
Xemacs    : 51 seconds
GNU Emacs : 1205 seconds
So the Xemacs is more than 23 times as fast as the GNU Emacs.
Benjamin Benninghofen
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