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From: "Stahle, Patrick" <patrick.stahle@te.com>
To: "users@pdfbox.apache.org" <users@pdfbox.apache.org>
Subject: Strange performance problem with certain PDF files
Thread-Topic: Strange performance problem with certain PDF files
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Date: Fri, 18 Mar 2016 19:01:56 +0000
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Hi all,

I am running into a lot of strange performance issues with certain PDF file=
s.

Background info:
The strange thing I can't reproduce this consistently. When I get a pdf bei=
ng generated on a particular environment it seems consistent. I do most of =
my development inside VirtualBox virtual machine running fedora. These pdf =
files I am having problems with never have performance issues when run on m=
y virtual machine local drive, but if I use a Virtual Box Shared drive as t=
he source / destination for the PDF, I see the problem. Another co-worker w=
orking from pure windows environment experience the performance problem. We=
 are also seeing the same issue on our dev solaris servers. The performance=
 range can be quite drastic on one of our 3DPDF's (12meg) running on my loc=
al environment it can be opened, stamped with some text, encrypted, and sav=
ed in around 8 sec. Doing the same job pointing to a virtual box share driv=
e or on our solaris server that same work will take minutes. On my coworker=
s windows environment it takes around 30 seconds. We really only reproduced=
 this consistently on the 12m 3D  PDF. I have a much smaller pdf (non 3d / =
convert from msoffice) that does show similar performance issue but the tim=
es range from 200ms local to 8 sec.

The one thing I see in common between the 2 files is I see a lot of the fol=
lowing messages to the console:
Using output from the 12m 3DPDF file:
:
:
1787 [main] DEBUG org.apache.pdfbox.pdfparser.PDFObjectStreamParser  - pars=
ed=3DCOSObject{13166, 0}

These messages seem to happen on the PDDocument.open and from what I can te=
ll, I get 13,166 of these messages in this example PDF.
The slowness does not happen until the following line:
document.save(outputPDFStream);

Other PDF's including some quite large I do not see this performance issue =
nor those log messages.

I know this is not much to go on, I am working on seeing if I can isolate t=
his down to something more concrete / reproducible point. But I thought I w=
ould send this out to see if anyone has any ideas or have seen issues simil=
ar to this? Suggestions?

Thanks,
Patrick


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