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Re: Emacs memory management and sluggishness

From: Joseph Mingrone
Subject: Re: Emacs memory management and sluggishness
Date: Wed, 31 Jul 2019 19:27:06 -0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (berkeley-unix)

Óscar Fuentes <address@hidden> writes:

> Joseph Mingrone <address@hidden> writes:

>> Óscar Fuentes <address@hidden> writes:

>>> Joseph Mingrone <address@hidden> writes:

>>>> I am seeing even more aggressive memory usage with recent master branch
>>>> commits (at least I think this only started in the last month or so).
>>>> Here is a screenshot that shows over 3 GB of
>>>> RSS. https://ftfl.ca/misc/emacs_memory.png

>>>> This was running commit 06726f6 from today on 12.0-RELEASE-p8.  I run
>>>> Gnus, erc, look at an occasional PDF and edit text.  I haven't visited
>>>> any extremely large buffers recently.  Garbage collection is happening,
>>>> but it does not seem to help.  But, when I call `garbage-collect'
>>>> manually there will be a long pause if I haven't called it recently,
>>>> then the memory will usually go down to something between 100 and 400
>>>> MB.

>>> Do the garbage collection, take note of the used memory, visit one of
>>> those PDF files (preferably one with large, complex & colorful images)
>>> move around for several pages and see if emacs' memory usage grows.

>> It went from 440 to about 500 MB.  This was a book with 1200
>> pages and the PDF was about 3 MB.

> How many pages of those 1200 you viewed? Do you use PDF-Tools or Doc
> View? If you execute `garbage-collect' does the memory go down?

> I'm asking all this because one of the possibilities is a leak on the
> image handling code.

I just tried it again and held down 'n' to visit all pages and the
memory stayed under 500 MB.  I am using pdf-tools v0.90.  I also just
tried with
and the memory stayed under 400 MB.  I'm somewhat confident that I
encountered memory issues in an Emacs instance without visiting a PDF

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