GNU bug report logs - #32728
Emacs slow when reading process output

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From: "Benninghofen, Benjamin Dr." <benjamin.benninghofen <at> airbus.com>
To: 32728 <at> debbugs.gnu.org
Cc: Kevin Layer <layer <at> franz.com>
Subject: bug#32728: Xemacs 23 times as fast as GNU Emacs
Date: Thu, 13 Sep 2018 08:42:32 +0000

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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)))
  t)

Alternatively the "input.txt" file can be created as follows:

#! /bin/bash
  last=1000000
  function base2 {
      echo "obase=2;$1" | bc
  }
  for k in $(seq 1 $last); do
      x=$(( k * k * k ))
      echo $(base2 $k) '^3 =' $(base2 $x)
  done

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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