GNU bug report logs - #38492
27.0.50; Warn pdumper users when pure space has been overflowed

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Kévin Le Gouguec <kevin.legouguec <at> gmail.com>
Subject: bug#38492: closed (Re: bug#38492: 27.0.50; Warn pdumper users
 when pure space has been overflowed)
Date: Sat, 14 Dec 2019 11:43:02 +0000

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

Your bug report

#38492: 27.0.50; Warn pdumper users when pure space has been overflowed

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 38492 <at> debbugs.gnu.org.

-- 
38492: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=38492
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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

From: Eli Zaretskii <eliz <at> gnu.org>
To: dancol <at> dancol.org
Cc: 38492-done <at> debbugs.gnu.org, kevin.legouguec <at> gmail.com
Subject: Re: bug#38492: 27.0.50; Warn pdumper users when pure space has been
 overflowed
Date: Sat, 14 Dec 2019 13:42:07 +0200

> Date: Fri, 06 Dec 2019 11:02:28 -0800
> From: dancol <at> dancol.org
> Cc: kevin.legouguec <at> gmail.com, 38492 <at> debbugs.gnu.org
> 
> > > We should probably consider just removing the pure space mechanism at 
> > > some point. 
> >
> > Does this mean you agree with removing the warning in startup.el 
> > about overflowed pure space?
> 
> Yes. 

Thanks, I removed the warning in a pdumper build, and I'm closing this
bug report.

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

From: Kévin Le Gouguec <kevin.legouguec <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; Warn pdumper users when pure space has been overflowed
Date: Wed, 04 Dec 2019 20:02:12 +0100

[Message part 4 (text/plain, inline)]

Hello,

For some reason, one of my setups[1] experiences a pure storage overflow
with the current master[2].  Searching previous bug reports for the
warning[3] led me to understand that increasing BASE_PURESIZE in
src/puresize.h would solve the issue; since I didn't have the patience
to recompile possibly multiple times, I tried to find a way to know
exactly how much I should increase this value.

I noticed that Fdump_emacs uses check_pure_size from alloc.c to print a
warning before dumping when this happens.  The following patch exposes
check_pure_size when we HAVE_PDUMPER, so that Fdump_emacs_portable can
use it too.

[0001-Warn-pdumper-users-when-pure-space-has-been-overflow.patch (text/x-diff, attachment)]

[Message part 6 (text/plain, inline)]

That gets me a helpful error message at compile-time[4] (as well as an
intriguing warning[5]) that let me figure out how much I should increase
BASE_PURESIZE by, recompile Emacs and run it with no further warnings
about pure storage overflow.

Would it make sense to apply this?  (Maybe not as-is: e.g. I don't know
if the #if guard is still useful at this point; maybe the call to
check_pure_size should be moved somewhere else…)

Thank you for your time.


[1] Debian Buster on Samsung NC10 (32-bit, 2GB RAM).

[2] 8bea7e9ab4453da71d9766d582089154f31de907

[3] Warning (initialization): Building Emacs overflowed pure space.  (See the node Pure Storage in the Lisp manual for details.)

[4] emacs:0:Pure Lisp storage overflow (approx. 2005404 bytes needed)

[5] alloc.c:5136:14: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘intmax_t’ {aka ‘long long int’} [-Wformat=]
         message (("emacs:0:Pure Lisp storage overflow (approx. %"pI"d"
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            " bytes needed)"),
            ~~~~~~~~~~~~~~~~~

    I tried to puzzle this one out by looking at the definition for pI
    in lisp.h, but I am not sure how to proceed.  The warning suggests
    that pI is defined as "" since the final format is %d, which means
    that I should look into this snippet:

    # elif INTPTR_MAX <= INT_MAX && !defined WIDE_EMACS_INT
    typedef int EMACS_INT;
    typedef unsigned int EMACS_UINT;
    enum { EMACS_INT_WIDTH = INT_WIDTH, EMACS_UINT_WIDTH = UINT_WIDTH };
    #  define EMACS_INT_MAX INT_MAX
    #  define pI ""

    … I can probably dig into this to see what's wrong on my setup[1],
    but I'll bank on someone more experienced going "Oh well duh" and
    fixing whatever needs fixing (assuming the problem isn't on my end).


In GNU Emacs 27.0.50 (build 11, i686-pc-linux-gnu, GTK+ Version 3.24.5, cairo version 1.16.0)
 of 2019-11-17 built on little-buster
Repository revision: 1c29ba034092660e73bce8c6ff459c75ff2c2d72
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux 10 (buster)

Configured using:
 'configure --with-xwidgets --with-cairo'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Features:
(shadow sort mail-extr emacsbug sendmail etags fileloop generator xref
vc-mtn vc-hg mule-util warnings filecache markdown-mode rx color
noutline outline help-fns radix-tree magit-extras sh-script smie
flyspell ispell executable cus-edit wid-edit whitespace notifications
dbus xml misearch multi-isearch bug-reference cc-mode cc-fonts cc-guess
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs thingatpt
magit-submodule magit-obsolete magit-blame magit-stash magit-reflog
magit-bisect magit-push magit-pull magit-fetch magit-clone magit-remote
magit-commit magit-sequence magit-notes magit-worktree magit-tag
magit-merge magit-branch magit-reset magit-files magit-refs magit-status
magit magit-repos magit-apply magit-wip magit-log which-func imenu
magit-diff smerge-mode magit-core magit-autorevert autorevert filenotify
magit-margin magit-transient magit-process magit-mode git-commit
magit-git magit-section magit-utils crm log-edit message rmc puny dired
dired-loaddefs rfc822 mml mml-sec epa derived epg epg-config gnus-util
rmail rmail-loaddefs text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums
mail-prsvr mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log
with-editor async-bytecomp async shell pcomplete server dash vc-git
vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs project delight
eighters-theme rg rg-info-hack advice rg-menu transient cl-extra
format-spec rg-ibuffer rg-result wgrep-rg wgrep s rg-history rg-header
ibuf-ext ibuffer ibuffer-loaddefs grep compile comint ansi-color ring
quail help-mode edmacro kmacro disp-table paren mb-depth icomplete
page-break-lines elec-pair diff-hl-flydiff diff diff-hl vc-dir ewoc vc
vc-dispatcher diff-mode easy-mmode delsel cus-start cus-load tex-site
info package easymenu browse-url url-handlers url-parse auth-source
cl-seq eieio eieio-core cl-macs eieio-loaddefs password-cache json
subr-x map url-vars seq byte-opt gv bytecomp byte-compile cconv
cl-loaddefs cl-lib tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame minibuffer cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
xwidget-internal cairo move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 8 330562 41453)
 (symbols 24 23104 2)
 (strings 16 73924 11567)
 (string-bytes 1 2445511)
 (vectors 8 42019)
 (vector-slots 4 959888 63404)
 (floats 8 281 269)
 (intervals 28 21802 357)
 (buffers 568 52))

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