[jira] [Commented] (PDFBOX-5286) Runtime degredation in RC1 and alpha2

["Tilman Hausherr (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-5286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17501346#comment-17501346 ] 

Tilman Hausherr commented on PDFBOX-5286:
-----------------------------------------

The last commit breaks the TestFax_56972.pdf test case in PDAcroFormFlattenTest. (enable this test case first, and then look at the differences). The result files are in pdfbox/target/test-output/flatten/out .

> Runtime degredation in RC1 and alpha2
> -------------------------------------
>
>                 Key: PDFBOX-5286
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5286
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Parsing
>    Affects Versions: 3.0.0 PDFBox
>            Reporter: Maruan Sahyoun
>            Priority: Critical
>         Attachments: flame-cpu-forward.html, flame-cpu-reverse.html, profiling.png
>
>
> working/reviewing PDFBOX-5068 and PDFBOX-5263 I've experiencing runtime issues for both 3.0.0-RC1 and 3.0.0-alpha2 when loading and saving a large PDF
> https://crossasia-books.ub.uni-heidelberg.de/xasia/reader/download/506/506-42-86246-2-10-20190822.pdf 
> ||version||runtime in millis||
> |2.0.24 |2076|
> |3.0.0-RC1 |219472|
> |3.0.0-alpha2 |282284|
> Basic test:
> {code:java}
> long start = System.currentTimeMillis();
> PDDocument pdf = Loader.loadPDF(new File("506-42-86246-2-10-20190822.pdf"));
> pdf.save(new NullOutputStream());
> pdf.close();        
> long end = System.currentTimeMillis();      
> System.out.println("Elapsed Time in milliseconds: "+ (end-start));     
> {code}
> with NullOuputStream
> {code:java}
> package org.apache.pdfbox;
> import java.io.IOException;
> import java.io.OutputStream;
> public class NullOutputStream extends OutputStream {
>     @Override
>     public void write(byte[] b) throws IOException {
>         // don't write anything
>     }
>     @Override
>     public void write(byte[] b, int off, int len) throws IOException {
>         // don't write anything
>     }
>     @Override
>     public void write(int b) throws IOException {
>         // don't write anything
>     }
> }
> {code}
> I've also running tests using JMH - they support these numbers. The difference in numbers for RC1/alpha2 are within a regular variation. 



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