GNU bug report logs - #58338
29.0.50; mapatoms called on more elements than in obarray?

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Philip Kaludercic <philipk <at> posteo.net>
Subject: bug#58338: closed (Re: bug#58338: 29.0.50; mapatoms called on
 more elements than in obarray?)
Date: Thu, 06 Oct 2022 18:52:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#58338: 29.0.50; mapatoms called on more elements than in obarray?

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 58338 <at> debbugs.gnu.org.

-- 
58338: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=58338
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Philip Kaludercic <philipk <at> posteo.net>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: 58338-done <at> debbugs.gnu.org
Subject: Re: bug#58338: 29.0.50; mapatoms called on more elements than in
 obarray?
Date: Thu, 06 Oct 2022 18:51:43 +0000

Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:

> On 22-10-06 20:28 , Philip Kaludercic wrote:
>> Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:
>> 
>>> On 22-10-06 20:21 , Philip Kaludercic wrote:
>>>
>>>> In that case what confuses me is that (length obarray) doesn't throw an
>>>> error.  Or what useful information does that give me?
>>>
>>> It's a vector, and each vector has a length.
>> But isn't the fact that it is a vector just a detail of the internal
>> implementation?
>
> It's all history.  Obarray existed since the Big Bang.  Don't use it.

OK, then I'll close the report.  But if I am not supposed to use the
obarrays, what would you recommend if I want to count the number of
known symbols?  (Context:  I am trying to detect all variables defined
in a package, and since that takes a while I wrapped the `mapatoms' call in
a progress reporter, that needs a maximal value).

[Message part 3 (message/rfc822, inline)]

From: Philip Kaludercic <philipk <at> posteo.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; mapatoms called on more elements than in obarray?
Date: Thu, 06 Oct 2022 16:16:03 +0000

From reading the docstring of `mapatoms', I would assume that this would
evaluate to t:

(let ((i 0))
  (mapatoms (lambda (_) (setq i (1+ i))) obarray)
  (= (length obarray) i))

But instead on my system I get (length obarray) ↝ 15121 and and i ↝
78050, which is are at a ratio of 5.16169565505.

Also interesting, if I intern a variable "foo", the value of i increases
to 83106, while (length obarray) stays the same (?)

Interestingly enough, I'd expect this to at least output a single
message:

(let ((ht (make-hash-table)))
  (mapatoms (lambda (s) (cl-incf (gethash s ht 0))))
  (maphash (lambda (sym i)
	     (when (> i 1)
	       (message "%S: %d" sym i)))
	   ht))

but apparently no symbol is invoked twice.  Not even by name

(let ((ht (make-hash-table :test #'equal)))
  (mapatoms (lambda (s) (cl-incf (gethash (symbol-name s) ht 0))))
  (maphash (lambda (sym i)
	     (when (> i 1)
	       (message "%S: %d" sym i)))
	   ht))

Is this perhaps related to symbol positions?  I don't quite understand
bare symbols yet, but it doesn't appear to change anything if I check

(let ((i 0))
  (mapatoms (lambda (s)
    (when (bare-symbol-p s)
      (setq i (1+ i))))
    obarray)
  (list (length obarray) i))

I am confused.  All I want is a max value for a progress reporter :(

In GNU Emacs 29.0.50 (build 14, x86_64-pc-linux-gnu, GTK+ Version
 3.24.34, cairo version 1.17.6) of 2022-10-06 built on rhea
Repository revision: 2c4c72b45d833b6ccdd2cc06ca3c6c9e9ad54357
Repository branch: feature/package+vc
System Description: Fedora Linux 36 (Workstation Edition)

Configured using:
 'configure --with-pgtk --with-imagemagick'

Configured features:
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Load-path shadows:
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/home/philip/.config/emacs/site-lisp/emacs-inspector/inspector-tests hides /home/philip/.config/emacs/elpa/inspector-0.8/inspector-tests
/home/philip/.config/emacs/site-lisp/flymake-proselint/flymake-proselint hides /home/philip/.config/emacs/elpa/flymake-proselint-0.3.0/flymake-proselint
/home/philip/.config/emacs/elpa/transient-0.3.7/transient hides /home/philip/Source/emacs/lisp/transient
/home/philip/.config/emacs/elpa/xref-1.5.1/xref hides /home/philip/Source/emacs/lisp/progmodes/xref

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Memory information:
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 (string-bytes 1 10565718)
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