[
https://issues.apache.org/jira/browse/COMPRESS-381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Stefan Bodewig resolved COMPRESS-381.
-------------------------------------
Resolution: Fixed
> performance issue when using default Wiki/docs bzip2 compression Factory
> methods
> --------------------------------------------------------------------------------
>
> Key: COMPRESS-381
> URL: https://issues.apache.org/jira/browse/COMPRESS-381
> Project: Commons Compress
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 1.13
> Environment: Windows/All
> Reporter: Dominique De Munck
> Priority: Minor
> Labels: documentation, easyfix, performance
>
> Hello
> We are going to use this project's bzip2 implementation as it performed best
> for our use case (tested using
> https://github.com/ning/jvm-compressor-benchmark).
> However, when following the default examples using the wiki/example/javadoc
> pages (*), we were hitting a serious performance bottleneck.
> The reason: the default "compress" operation on a file which is suggested, is
> very slow, maybe because of disk I/O and lack of caching.
> For a 2 MB tiff file, bzip2 compression takes about 3 seconds with code (A),
> whereas code (B) takes only about 0.5 seconds!
> So it would be good to adapt documentation or take a look at bottle neck.
> Kind regards
> Dominique
> >>>
> FileInputStream fin = new FileInputStream(infile);
> BufferedInputStream bufferin = new BufferedInputStream(fin);
> final FileOutputStream outStream = new FileOutputStream(outfile);
> CompressorOutputStream cos = new CompressorStreamFactory()
> .createCompressorOutputStream(CompressorStreamFactory.BZIP2, outStream);
> IOUtils.copy(fin, cos);
> cos.close();
> >>>
> B:
> <<<<<
> final byte[] uncompressed = Files.readAllBytes(infile.toPath());
> ByteArrayOutputStream rawOut = new ByteArrayOutputStream(uncompressed.length);
>
> BZip2CompressorOutputStream out = new BZip2CompressorOutputStream(rawOut,
> COMPRESSION_LEVEL);
> out.write(uncompressed);
> out.close();
> FileOutputStream fos = new FileOutputStream(outfile);
> rawOut.writeTo(fos);
> fos.close();
> >>>>
> (*)
> Pages with documentation:
> https://wiki.apache.org/commons/Compress
> https://commons.apache.org/proper/commons-compress/examples.html
> https://commons.apache.org/proper/commons-compress/javadocs/api-release/index.html
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
