Re: Emacs on Android OOMs with pdf-tools. (And an Android howto.)

[Lockywolf <lockywolf@gmail.com>]

Date: Thu, 22 Aug 2024 08:12:44 +0800

Thanks everyone for the memory-report command, I hadn't known about it
before this case.

>How much memory does your device provide?

The device has 2 Gb of RAM, of which about 1.5 Gb are ordinarily used by
the system and built-in annoyances.
I am trying to _only_ use Emacs on this device, so it should have about
500 Mb left.

But I am pretty sure it is not actually the problem of not enough
memory, as memory-report is clearly showing that something is wrong.

The two reports, before and after the OOM message, are below.
The concerning bit seems to be: "256 MiB  Total Image Cache Size"
256 Mb is a significant number for this device. Below I am also
pasting memory-report with doc-view-mode, which seems to "only" generate
160 Mb of image-cache.

Is it possible to tell Emacs to not generate so much cache?


* Before

Estimated Emacs Memory Usage

     5 MiB  Overall Object Memory Usage
   2.3 MiB  Memory Used By Global Variables
   1.1 MiB  Memory Used By Symbol Plists
   451 KiB  Total Image Cache Size
   237 KiB  Reserved (But Unused) Object Memory
    36 KiB  Total Buffer Memory Usage

Object Storage

   2.2 MiB  Strings
   1.2 MiB  Conses
   1.2 MiB  Vectors
   374 KiB  Symbols
     6 KiB  Intervals
     5 KiB  Buffer-Objects
   1.1 KiB  Floats

Largest Buffers

    11 KiB  andrei
   9.6 KiB  *scratch*
   6.1 KiB  *Messages*
   2.4 KiB   *Minibuf-1*
   2.1 KiB   *code-conversion-work*
   2.1 KiB   *Echo Area 0*
   2.1 KiB   *Echo Area 1*
     203 B  *Memory Report*
     173 B   *Minibuf-0*

Largest Variables

   356 KiB  package-archive-contents
   319 KiB  load-history
   115 KiB  definition-prefixes
   107 KiB  easy-menu-converted-items-table
    79 KiB  org-entities
    64 KiB  widget-global-map
    64 KiB  help-quick-use-map
    64 KiB  global-map
    60 KiB  face--new-frame-defaults
    55 KiB  input-method-alist
    51 KiB  package--builtins
    47 KiB  coding-system-alist
    41 KiB  language-info-alist
    41 KiB  color-name-rgb-alist
    25 KiB  menu-bar-options-menu
    24 KiB  x-colors
    22 KiB  key-translation-map
    21 KiB  org-mode-map
    20 KiB  package--compatibility-table
    19 KiB  minor-mode-map-alist



* After

Estimated Emacs Memory Usage

   256 MiB  Total Image Cache Size
   9.2 MiB  Overall Object Memory Usage
   2.7 MiB  Memory Used By Global Variables
   1.3 MiB  Memory Used By Symbol Plists
   803 KiB  Total Buffer Memory Usage
   245 KiB  Reserved (But Unused) Object Memory

Object Storage

   4.7 MiB  Strings
   2.3 MiB  Vectors
   1.7 MiB  Conses
   485 KiB  Symbols
    12 KiB  Floats
    10 KiB  Intervals
   8.9 KiB  Buffer-Objects

Largest Buffers

   744 KiB  mutual-information-Romaschenko_1710.05984.pdf
    14 KiB  memory-report-before-pdf-tools.txt
    11 KiB  andrei
   9.6 KiB  *scratch*
   6.1 KiB  *Messages*
   2.4 KiB   *Minibuf-1*
   2.2 KiB   *eldoc for major-mode*
   2.1 KiB   *Echo Area 0*
   2.1 KiB   *pdf-info-query--escape*
   2.1 KiB   *code-conversion-work*
   2.1 KiB   *Echo Area 1*
   2.1 KiB   tq-temp-epdfinfo
   2.1 KiB   *pdf-info-query--parse-response*
     203 B  *Memory Report*
     173 B   *Minibuf-0*
      96 B   *epdfinfo*

Largest Variables

   369 KiB  load-history
   356 KiB  package-archive-contents
   148 KiB  easy-menu-converted-items-table
   115 KiB  definition-prefixes
   102 KiB  minor-mode-map-alist
    79 KiB  org-entities
    68 KiB  face--new-frame-defaults
    64 KiB  tablist-edit-column-minor-mode-map
    64 KiB  widget-global-map
    64 KiB  help-quick-use-map
    64 KiB  global-map
    55 KiB  input-method-alist
    51 KiB  package--builtins
    47 KiB  coding-system-alist
    41 KiB  language-info-alist
    41 KiB  color-name-rgb-alist
    27 KiB  custom-face-all
    25 KiB  menu-bar-options-menu
    24 KiB  x-colors
    22 KiB  key-translation-map

* doc-view-mode

Estimated Emacs Memory Usage

   160 MiB  Total Image Cache Size
     6 MiB  Overall Object Memory Usage
   2.3 MiB  Memory Used By Global Variables
   1.1 MiB  Memory Used By Symbol Plists
   568 KiB  Total Buffer Memory Usage
   361 KiB  Reserved (But Unused) Object Memory

Object Storage

   2.3 MiB  Strings
   2.1 MiB  Vectors
   1.2 MiB  Conses
   384 KiB  Symbols
   6.4 KiB  Intervals
   5.5 KiB  Buffer-Objects
   1.4 KiB  Floats

Largest Buffers

   531 KiB  mutual-information-Romaschenko_1710.05984.pdf
    12 KiB  andrei
   9.8 KiB  *scratch*
   6.1 KiB  *Messages*
   2.4 KiB   *Minibuf-1*
   2.1 KiB   *code-conversion-work*
   2.1 KiB   *Echo Area 0*
   2.1 KiB   *Echo Area 1*
     203 B  *Memory Report*
     173 B   *Minibuf-0*

Largest Variables

   356 KiB  package-archive-contents
   323 KiB  load-history
   119 KiB  easy-menu-converted-items-table
   115 KiB  definition-prefixes
    79 KiB  org-entities
    64 KiB  widget-global-map
    64 KiB  help-quick-use-map
    64 KiB  global-map
    60 KiB  face--new-frame-defaults
    55 KiB  input-method-alist
    51 KiB  package--builtins
    47 KiB  coding-system-alist
    41 KiB  language-info-alist
    41 KiB  color-name-rgb-alist
    25 KiB  menu-bar-options-menu
    24 KiB  x-colors
    22 KiB  key-translation-map
    21 KiB  org-mode-map
    20 KiB  package--compatibility-table
    20 KiB  minor-mode-map-alist




-- 
Your sincerely,
Vladimir Nikishkin (MiEr, lockywolf)
(Laptop)