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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4363) Add simple benchmark for measuring GROUP BY performance
Date Tue, 08 Sep 2009 23:26:57 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Bryan Pendleton updated DERBY-4363:

    Attachment: bmWithPatch.out

Attached is 'benchmark.sh', which contains the simple script that I ran to
conduct a 15-item benchmark of the GROUP BY statement with and without
the DERBY-3002 patch applied.

Also attached is 'bmTrunk.out' and 'bmWithPatch.out', which are the benchmark
results of the script on a clean trunk build, and on a build with the DERBY-3002 patch.

Unfortunately, the benchmark appears to show substantial performance
problems with the DERBY-3002 patch, so I'll have to look into the results more deeply.

I suspect that this means that the DERBY-3002 patch cannot simply eliminate
the code patch which performs aggregation within the sort observer, because
the performance wins from doing such aggregation are substantial.

> Add simple benchmark for measuring GROUP BY performance
> -------------------------------------------------------
>                 Key: DERBY-4363
>                 URL: https://issues.apache.org/jira/browse/DERBY-4363
>             Project: Derby
>          Issue Type: Sub-task
>          Components: Test, Tools
>            Reporter: Bryan Pendleton
>            Assignee: Bryan Pendleton
>            Priority: Minor
>         Attachments: benchmark.sh, bmTrunk.out, bmWithPatch.out, multiColumnBenchmark.diff,
> As part of ROLLUP implementation (DERBY-3002), it will be helpful to be able to measure
the performance of GROUP BY.
> Using the o.a.dT.perf.clients framework, this sub-task proposes to add a GroupByClient
to the performance runner
> library; the GroupByClient will run GROUP BY statements against the Wisconsin benchmark

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