[Okular-devel] [Bug 269667] Most all pages go all black once enough pdfs are open

benson.bear at gmail.com benson.bear at gmail.com
Wed Mar 30 09:26:15 CEST 2011


https://bugs.kde.org/show_bug.cgi?id=269667





--- Comment #2 from  <benson bear gmail com>  2011-03-30 09:26:11 ---
A few more details: if I start with X at about 50M, 150M virtual, and no
okular, and then open a large pdf file in okular and hit page down while under
normal or aggressive performance settings, X remains at about 50M but its
virtual size rises very quickly to 3G, and this is cached by the OS so cached
memory rises quickly by 3G as well.  This is reasonable behavior of course
since the memory is available to perform the caching.

But around this point, things go black.  In the other threads of discussion,
okular developers have said that separate okular instances have no interaction,
which is not what I believed at first, because if I open another okular
instance at this point, everything is black whereas if I open acroread, things
are renderered normally -- or so I thought.  No, some time later (although not
for a while) acroread has problems as well (not quite the same -- a lot of
white patches).  So I guess this means it is not really an okular bug per se. 

If I now quite the large okular instance, virtual X memory and OS cache sizes
drop back to what they were before (so X has changed its behavior in this
regard apparently).  Acroread works as normal, but the other okular instances
have trouble and go black even though the virtual X size remains very small.  

If I quite all the okulars and start again we appear to be back to the starting
point.

None of this will happen if I use okular in low performance mode.  The
performance is not all that worse (it is worse though) so I guess I will
resolve to keep doing this.  

I guess it is not really an okular bug, but okular pushing the system into a
point where other problems become apparent, and by far most obviously so in
okular itself.   I will try to try this on some other systems to see if it is
repeatable with other video cards or drivers.

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