[jira] Commented: (PDFBOX-556) Performance regression from 0.7.3 to 0.8.0

["Andreas Lehmkühler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774831#action_12774831 ] 

Andreas Lehmkühler commented on PDFBOX-556:
-------------------------------------------

Hmm, there are a lot of changes between these version.

Did you compare your 0.8.0 profiling results to the old 0.7.3 version? The invocation of cmpCircularBuffer is probably a good hint but perhaps it was already a bottle neck in the old version .... 
Did you try to disable/minimize the logging? It is often an perfomance issue if there is too much log output.

> Performance regression from 0.7.3 to 0.8.0
> ------------------------------------------
>
>                 Key: PDFBOX-556
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-556
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Parsing
>    Affects Versions: 0.8.0-incubator
>            Reporter: Lars Torunski
>         Attachments: screenshot-1.jpg
>
>
> After upgrading from version 0.7.3 to 0.8.0 our pdf indexing for lucene takes a lot longer than expected.
> E.g. a single pdf needs 1150ms to be indexed compared to 750ms with version 0.7.3 ==>  +50%
> My first thought was that more pdfs are indexed or even indexed correctly with 0.8.0. But that shouldn't be an impact more than 50%.
> Profiling with YourKit shows that a lot of time is spent in the method BaseParser.readUntilEndStream and it's invocation of cmpCircularBuffer. Maybe somebody find out how to improve the performance here.
> The method readUntilEndStream handles endobj tags in the stream also which impacts of course the performance, but this is OK.

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