Am 23.11.2012 06:39, schrieb Adam Reichold:
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Hello,
Not sure if this question is intended for everybody on the list or
only the developers, but I'll just assume it's for everyone:
Looking at the feature list and reading the bug tracker, I'd say that
thread-safety needs to be rethought. Maybe one could make this a
priority for the next release cycle, trying to implement the long-term
solution of removing PDFDoc::getXRef and better distributing the
workload, maybe under Thomas' and/or Albert's supervision. (I would be
happy to help as much as I can, but I am not very knowledgeable about
Poppler's internals yet.)
I had yesterday a long, long day working on getting annotations thread
safe, and I recognized several things:
1. We can't remove PDFDoc::getXRef completely: we have the Gfx:getXRef
only during rendering, but there are several different tasks done with
poppler, i.e. getting information, manipulation annotations, rewrite
PDF, etc. etc. This all must be done over PDFDoc:getXRef
2. I tried to copy the annotations for every thread, but after
succeeding rendering became MUCH too slow.
3. Therefore I shared annotations over the threads (via the catalog),
this was a also bigger task but at least successfully.
Atfer completing that I made several tests:
1. Rendering with and without the patch takes the same time
2. Rendering with the patch but only one thread is nearly as fast as
without the patch (It always took the same number of seconds for multi
page PDF)
3. Rendering with more than one thread decrease the time for rendering,
the more the complex the PDF is.
So the latest patch on
https://bugs.freedesktop.org/show_bug.cgi?id=50992 does what is should
do (I missed the notification e-mail for my latest comments, so I'm nor
sure if everbody else got them), so if Albert is able to test it before
beta 3 it would be nice to have it. Otherwise with my changes of
yesterday the patch again became quite huge, so I would understand if
Albert want to suspend it 'til next year.
Cheers,
Thomas
Still, I would argue for a third beta since the RTL stuff seems almost
like a bug and less like a missing feature and probably affects a lot
of people. (I would also include #2981 here, which depends on #55977.)
Best regards, Adam.
Am 23.11.2012 00:51, schrieb Albert Astals Cid:
Hi guys, if you look at
http://freedesktop.org/wiki/Software/poppler you'll see that there
are 5 features listed for 0.22 and that I just released 0.21.2 that
was supposed to be the last release with new features.
I don't think we'll be getting all 5 in, but if we create a new
Beta 3 with let's say 1 week more of time maybe we can get 1 or 2
more in.
What do you think?
Cheers, Albert _______________________________________________
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