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https://issues.apache.org/jira/browse/DERBY-5471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13281926#comment-13281926
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Mike Matrigali commented on DERBY-5471:
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the latest results concern me, I did not expect identity column performance to
slow down for trunk as part of my changes - and thought that rick's posted
performance tests verified that. I am going to create a new issue to just
concentrate on identity performance in trunk (and soon to be 10.9). The goal
of the changes were to keep the lazy commit for identity columns but not for
sequences. So expected performance of identity columns to stay the same.
> Stress test for identity columns and sequence seem to be taking longer on
> trunk compared to 10.8.2.2 RC3
> --------------------------------------------------------------------------------------------------------
>
> Key: DERBY-5471
> URL: https://issues.apache.org/jira/browse/DERBY-5471
> Project: Derby
> Issue Type: Task
> Components: Test
> Affects Versions: 10.9.1.0
> Environment: Windows XP version 2.18
> Genuine Intel(R) CPU T2600 dual core @2.16GHz 2.00GB of RAM
> $ java -version
> java version "1.6.0"
> Java(TM) SE Runtime Environment (build pwi3260sr9fp1-20110208_03(SR9 FP1))
> IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 Windows XP x86-32
> jvmwi3260sr9-201102
> 03_74623 (JIT enabled, AOT enabled)
> J9VM - 20110203_074623
> JIT - r9_20101028_17488ifx3
> GC - 20101027_AA)
> JCL - 20110203_01
> Reporter: Mamta A. Satoor
> Attachments: 5471-performance.html
>
>
> I have been trying to run org.apache.derbyTesting.perf.clients.Runner (which
> provides ways to stress test sequence generator and identity columns) on
> trunk and 10.8.2.2 RC3 to compare the performance and I find that it takes
> almost double the time for the tests to finish on trunk. Additionally, the
> identity column test consistently ran into lock timeouts on trunk. I am
> running with insane jars on trunk and 10.8.2.2 RC3. The test in question is
> not in official jars for the release candidate so I manually copied them to
> 10.8.2.2 RC3 environment during my test(basically copied the entire
> org.apache.derbyTesting.perf.clients.Runner directory from trunk to 10.8.2.2
> RC3 environment).
> Command to do sequence stress testing is as follows
> java org.apache.derbyTesting.perf.clients.Runner -driver
> org.apache.derby.jdbc.EmbeddedDriver -init -load seq_gen -load_opts
> debugging=1,numberOfGenerators=5,tablesPerGenerator=10,insertsPerTransaction=100,identityTest=0
> -gen b2b -threads 10
> Command to do identity column stress testing is as follows
> time java org.apache.derbyTesting.perf.clients.Runner -driver
> org.apache.derby.jdbc.EmbeddedDriver -init -load seq_gen -load_opts
> debugging=1,numberOfGenerators=5,tablesPerGenerator=10,insertsPerTransaction=100,identityTest=1
> -gen b2b -threads 10
> An average run on 10.8.2.2 RC3 for sequence stress test is about a minute and
> 46 secs. On trunk, on an average it takes 2 and half minutes
> An average run on 10.8.2.2 RC3 for identity stress test is about a minute and
> 50 secs. On trunk, on an average it takes 3minsutes and 30 secs. Also, on
> trunk, this test runs into lock timeouts.
> I was wondering if this is the right behavior. The performance should be
> better in trunk because of pre-allocation of range for sequences and identity
> columns(which defaults to 20) but unless I have missed something in my tests,
> the results don't show the performance improvement.
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