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https://issues.apache.org/jira/browse/PDFBOX-5286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17424084#comment-17424084
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Maruan Sahyoun edited comment on PDFBOX-5286 at 10/4/21, 6:13 PM:
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Some quick number
{noformat}
2.0.24
saveMediumFile 1492,319 ± 144,831 ms/op
3.0.0-alpha2
saveMediumFile 5760,922 ± 661,071 ms/op
saveNoCompressionMediumFile 3647,965 ± 203,258 ms/op
2.0.24
saveLargeFile 2636,223 ± 345,987 ms/op
3.0.0-alpha2
saveLargeFile 247090,290 ± 194051,696 ms/op
saveNoCompressionLargeFile 67161,364 ± 19638,638 ms/op
{noformat}
So looks like for small to medium files the impact is modest for both
compressed and uncompressed saving but for large ones the numbers are
considerably larger even when saving uncompressed.
was (Author: msahyoun):
Some quick number
{noformat}
2.0.24
saveMediumFile 1492,319 ± 144,831 ms/op
3.0.0-alpha2
saveMediumFile 5760,922 ± 661,071 ms/op
saveNoCompressionMediumFile 3647,965 ± 203,258 ms/op
2.0.24
saveLargeFile 2636,223 ± 345,987 ms/op
3.0.0-alpha2
saveLargeFile 247090,290 ± 194051,696 ms/op
saveNoCompressionLargeFile 67161,364 ± 19638,638 ms/op
{noformat}
> 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
>
> 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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