Bug 78016 - High process load while rendering pdf
Summary: High process load while rendering pdf
Status: NEW
Alias: None
Product: poppler
Classification: Unclassified
Component: cairo backend (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: poppler-bugs
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Reported: 2014-04-27 22:25 UTC by Germán Poo-Caamaño
Modified: 2014-11-01 06:12 UTC (History)
0 users

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Description Germán Poo-Caamaño 2014-04-27 22:25:24 UTC
This was reported in https://bugzilla.gnome.org/show_bug.cgi?id=728998

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When I scroll document, it takes more than a minute to show a page,
during this time one of cpu cores is fully loaded.
Another pdf viewer works well.

Link to a file
https://mega.co.nz/#!1donRahR!r01FPw3DHI7dpW09biJXydlYsbDlF3H_sPE63BqldQw
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I can reproduce the problem with poppler-glib-demo and qt4-demo using
Arthur (0.26).
Comment 1 Albert Astals Cid 2014-04-27 22:55:30 UTC
What about splash? (Arthur backend is not production ready really, so you shouldn't be really using it for anything)
Comment 2 Germán Poo-Caamaño 2014-04-27 23:12:09 UTC
Splash renders the document as expected (I forgot to mention it).

I tested with all of them only to check in which product to file the bug.
I will keep in mind for the future to not test against Arthur.
Comment 3 Thomas Freitag 2014-04-28 08:34:23 UTC
Seems to be "cairo backend" problem only: I can open it in okular without seeing that problem, and time measurement shows me:

time ./utils/pdftoppm -png -cropbox -f 1 -l 10 78016.open/lecture4.pdf output/78016

real	0m6.556s
user	0m6.516s
sys	0m0.016s

(which is a reasonable time because of the usage of pattern colorspaces, but:)

time ./utils/pdftocairo -png -cropbox -f 1 -l 10 78016.open/lecture4.pdf output/78016-cairo

real	2m52.166s
user	2m45.826s
sys	0m6.012s
Comment 4 Adrian Johnson 2014-11-01 06:12:02 UTC
With master it takes my PC 157 seconds to render the first 10 pages with pdftocairo. With the patch at bug 33364 it takes 32 seconds.


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