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https://issues.apache.org/jira/browse/JENA-256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295174#comment-13295174
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Simon Helsen commented on JENA-256:
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so I tested it with Sun's JRE and the effect is more or less the same. It is
slighly less outspoken, but still clearly slower. One thing to note that is the
first test run with RC is not as slow as subsequent ones, which seems different
with the May 15 build. However, even the first run with the RC candidate is
always slower than the first run with the May 15 build, whether it runs on
IBM's or Oracle's JRE
> Significant performance regression (TDB?) on 2.7.1 RC compared to May 15 build
> ------------------------------------------------------------------------------
>
> Key: JENA-256
> URL: https://issues.apache.org/jira/browse/JENA-256
> Project: Apache Jena
> Issue Type: Bug
> Components: TDB
> Affects Versions: Jena 2.7.1
> Environment: Windows 7, 64 bit, tested against 2.7.1 RC from June 9
> versus a build from May 15
> Reporter: Simon Helsen
> Priority: Critical
> Attachments: 271May15Output1.txt, 271May15Output2.txt,
> 271May15Output3.txt, 271May15Output4.txt, 271RCOutput1.txt, 271RCOutput2.txt,
> 271RCOutput3.txt, 271RCOutput4.txt, PerformanceRegressionTest.java
>
>
> See also
> http://mail-archives.apache.org/mod_mbox/jena-dev/201206.mbox/%3C4FD9F19E.3080904%40bristol.ac.uk%3E
> I was able to reproduce the performance regression with an isolated test
> scenario. So I recreated the components ARQ, CORE, IRI, and TDB with the SVN
> state of May 15 9 (so svn update -r {2012-05-15} and then svn clean install)
> I then created a simple test program (attached as
> PerformanceRegressionTest.java) which I ran 4 times in a row for each version
> of Jena. Note that I deleted the TDB directory after the first 4 runs before
> using the other Jena version. Attached are the files with the output. The
> regression is obvious
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