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Simon Helsen commented on JENA-256: ----------------------------------- ok, so I also ran the tests with the createDataset outside the loop. The effect is identical. Although this situation increases the overall speed slightly (in both builds), it hardly makes a difference. This doesn't surprise me because in my first version of the test, I had recorded the time of the dataset creation and (as hoped) it was very small, almost negligible. Another reason I didn't think this would matter was that my previous internal tests showed that non-transactional code was still fast and I need to create a dataset in the non-transactional case as well. In other words, the createDataset is not part of the problem. The regression sits direct in the transaction > 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 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira