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https://issues.apache.org/jira/browse/PDFBOX-2882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14628571#comment-14628571
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John Hewson commented on PDFBOX-2882:
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{quote}
50MB of main-memory
{quote}
That's a tiny amount of memory, so you might be causing the no-scratch-file
implementation to page via virtual memory, which will make it as slow as your
scratch file. Try using much more memory, 256 or 512mb. Also try disabling
virtual memory in your VM to ensure that you're not paging.
> Improve performance when using scratch file
> -------------------------------------------
>
> Key: PDFBOX-2882
> URL: https://issues.apache.org/jira/browse/PDFBOX-2882
> Project: PDFBox
> Issue Type: Improvement
> Components: Parsing
> Affects Versions: 2.0.0
> Reporter: Timo Boehme
> Assignee: Timo Boehme
> Priority: Minor
> Attachments: ScratchFile.java, ScratchFileBuffer.java
>
>
> The current scratch file implementation uses many direct I/O calls which
> slows down parsing compared with in-memory scratch buffer considerably.
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