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https://issues.apache.org/jira/browse/DERBY-2988?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John H. Embretsen closed DERBY-2988.
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Thank you for committing, Bryan! The fix is in the trunk, so I'm closing the
issue.
> Add max heap memory setting for JVMs spawned when running ant junitreport
> -------------------------------------------------------------------------
>
> Key: DERBY-2988
> URL: https://issues.apache.org/jira/browse/DERBY-2988
> Project: Derby
> Issue Type: Test
> Components: Build tools, Test
> Affects Versions: 10.4.0.0
> Reporter: John H. Embretsen
> Assignee: John H. Embretsen
> Fix For: 10.4.0.0
>
> Attachments: d2988_v1.diff, d2988_v1.stat
>
>
> Rationale for adding an explicit max heap size setting for JVMs spawned by
> ant when running 'ant junitreport':
> 1) To avoid running out of memory during runs of 'ant junitreport' on systems
> where the default max heap size is too small for one or more test suites
> executed by the junitreport target. For example, on client-class machines
> using Sun's JVM (version 1.6 or older) the default max heap size is usually
> 64 MB. The lang._Suite junit test suite currently requires roughly 170 MB.
> This will reduce some unnecessary noise in the developers' regression test
> results.
> 2) To have the test suites run with consistent max heap size settings
> regardless of machine class. By using default values, some machines/JVMs run
> with 64 MB max heap while others run with 512 MB or more, resulting in
> memory-related test failures only in some environments. This might complicate
> debugging.
> 3) Developers will have a better picture of the memory requirements of a test
> suite if it should fail with OutOfMemoryError via 'ant junitreport'. Without
> this change, extra effort (e.g. JVM monitoring) is required to know the exact
> value of the heap size limit that was exceeded.
> A discussion on the derby-dev mailing list provides some more details:
> http://www.nabble.com/Do-I-need-to-provide-extra-memory-flags-when-using-%22ant-junitreport%22--t4139842.html
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