[Poppler-bugs] [Bug 77087] High CPU usage

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77087

--- Comment #1 from William Bader <williambader at hotmail.com> ---
Created attachment 96961
  --> https://bugs.freedesktop.org/attachment.cgi?id=96961&action=edit
profile of pdftoppm -png i04d_20140404_1836.pdf  /tmp/x

For an additional data point, I have Fedora 20 with the mate desktop, and
"atril" (the mate version of evince) is also very slow on this file while gs
9.14 opens it almost instantly.  Fedora 20 has poppler 0.24.3.

pdftoppm is also slow, which might make this easier to debug because pdftoppm
is easier to build than evince.

pdftops processes the file in under 1 second.

It might be related to rasterizing a lot of text in small fonts because evince
and atril have to do that while pdftops can just pass the fonts through.

pdftoppm and pdftocairo both fail with -jpeg but pdftoppm -png works although
it is slow.

$ time /usr/bin/pdftoppm -png i04d_20140404_1836.pdf  /tmp/x.ps
real    1m30.491s
user    1m30.235s
sys     0m0.202s

Here are the first few lines of a profile of the pdftoppm command above.  I
attached the full profile which I made from a git clone of the poppler from Feb
19, 2014.

  %   cumulative   self              self     total
 time   seconds   seconds    calls   s/call   s/call  name
 62.62     16.99    16.99 749102576     0.00     0.00 
Splash::pipeRunAARGB8(SplashPipe*)
 22.71     23.15     6.16    31880     0.00     0.00 
Splash::fillWithPattern(SplashPath*, bool, SplashPattern*, double)
  2.65     23.87     0.72  1708951     0.00     0.00 
SplashXPathScanner::renderAALine(SplashBitmap*, int*, int*, int, bool)

I suspect that the pattern fill is part of the font rasterization.
Adding "-aaVector no -aa no" reduces the time a little.
$ time /usr/bin/pdftoppm -aaVector no -aa no -png i04d_20140404_1836.pdf 
/tmp/x
real    0m57.463s
user    0m57.164s
sys     0m0.247s

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/poppler-bugs/attachments/20140405/77bef12e/attachment.html>