[Okular-devel] [Bug 177213] High X server memory consumption

[Oscar Fuentes]

http://bugs.kde.org/show_bug.cgi?id=177213





--- Comment #2 from Oscar Fuentes <ofv wanadoo es>  2008-12-08 21:18:50 ---
The problem, as it seems, is not restricted to the djvu backend. A large pdf
shows it too:

Open a large pdf document, such as

http://open-std.org/JTC1/SC22/WG21/docs/papers/2008/n2588.pdf

Press the PageDown key and keep it pressed.

Keep an eye on `top` or other memory reporting tool, looking at the Xorg
process.

On the Kubuntu machine, the memory skyrockets after reaching around page 500,
but the X process already was using 700 MB of RES memory, so maybe some empty
buffers were filled before requesting new memory. This high memory usage of X
is something I'm investigating and it's the way I found the problem with
Okular. I've observed that sometimes not all the memory used by X is freed
after Okular closes, so this memory can be a remannt from previous Okular
sessions.

To make less plausible the hypothesis of a bug on the X server distributed with
Kubuntu 8.10, tried another X server: xming 6.9.0.23 running on Windows 2000.
Okular was ran on the Kubuntu machine as

okular --display ahost:0 thedoc.pdf

The memory consumption was evident: starting at 23MB when Okular is executed,
it reaches 200 MB after scrolling 70 pages.

xpdf, with the same document, does not change the memory used by the X server
no matter how much pages are displayed.


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