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https://issues.apache.org/jira/browse/OPENEJB-1265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Gumbrecht resolved OPENEJB-1265.
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Resolution: Implemented
Fix Version/s: (trunk/openejb)
Access to the ByteArrayOutputStream is synchronized and can simply be reset.
> TempClassLoader buffer reuse reduces memory requirements
> --------------------------------------------------------
>
> Key: OPENEJB-1265
> URL: https://issues.apache.org/jira/browse/OPENEJB-1265
> Project: OpenEJB
> Issue Type: Improvement
> Components: server
> Affects Versions: 3.1.x
> Environment: All
> Reporter: Andy Gumbrecht
> Priority: Trivial
> Labels: OpenEJB, TempClassLoader
> Fix For: (trunk/openejb)
>
> Attachments: TempClassLoader.patch
>
> Original Estimate: 0h
> Remaining Estimate: 0h
>
> The current TempClassLoader potentially uses a new 8k ByteArrayOutputStream
> per class that it inspects.
> Whilst hunting for a possible ClassLoader issue I found that replacing the
> ByteArrayOutputStream with a reusable one leads to a substantial reduction in
> memory during server start up.
> I am unable to quantify what 'substantial' means in real terms as I have not
> run any real benchmarking, but it is fair to say that I had noticed heap
> sizes growing to over 180m during a server start compared to the 90m that I
> have now. These values would be application specific, but it would be nice to
> see if this is an improvement for others.
> I have also synchronized a few access methods to ensure that resources are
> protected during the inspection process.
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