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Posted to dev@jena.apache.org by "Andy Seaborne (JIRA)" <ji...@apache.org> on 2012/06/14 19:14:42 UTC
[jira] [Commented] (JENA-256) Significant performance regression
(TDB?) on 2.7.1 RC compared to May 15 build
[ https://issues.apache.org/jira/browse/JENA-256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295170#comment-13295170 ]
Andy Seaborne commented on JENA-256:
------------------------------------
Quick questions:
On what system were these executed? Windows vs Linux? JRE? etc etc.
Why does it do "TDBFactory.createDataset(location);" each time? If outside the loop, what happens?
> 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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