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https://issues.apache.org/jira/browse/PDFBOX-5169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17337140#comment-17337140
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Jakov Vežić commented on PDFBOX-5169:
-------------------------------------
With the latest snapshot, using a CPU optimized droplet on Digital Ocean (Xeon
E5-2650) with 8 threads and 16 GB RAM, it takes about 5 minutes to merge. The
merging takes up about 2 GB of RAM and uses mostly a single thread for nearly
the whole duration of the merge (2.0.23, for example, uses all threads).
Running it on Java 11.
This is the file I get: [https://www.dropbox.com/s/b5w3w95iprr1j7n/out.pdf?dl=1]
When I open it in Acrobat Reader (latest) it opens but hangs almost immediately
with Acrobat Reader not responding. This behavior happens on 5 different PCs -
and the result is the same when I run the merge on Windows as well.
> PDFMerger produces overly large output PDF
> ------------------------------------------
>
> Key: PDFBOX-5169
> URL: https://issues.apache.org/jira/browse/PDFBOX-5169
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.22, 2.0.23
> Environment: Debian 10
> Reporter: Jakov Vežić
> Priority: Minor
>
> Using PDFMerger to combine
> [https://www.dropbox.com/s/kprk7aeggni420c/1.pdf?dl=1]
> with
> [https://www.dropbox.com/s/0h8bced4tm3gppz/2.pdf?dl=1]
> results in an overly large file. The two input files are 1,25 MB and 16,3 MB
> large, while the output file is just over 400 MB large. The action also
> consumes about 1 GB of memory. No errors are produced during the merge that I
> can tell.
> The command is:
> {code:java}
> java -Xmx2500M -jar pdfbox-app-2.0.23.jar PDFMerger 1.pdf 2.pdf output.pdf
> {code}
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