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https://issues.apache.org/jira/browse/VELOCITY-606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615632#action_12615632
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Will Glass-Husain commented on VELOCITY-606:
--------------------------------------------
That's really interesting.
Did your templates include macros or includes? There's been significant
performance improvements with macros and includes in the (unreleased) Velocity
1.6 code base.
> Velocity 1.5 performance bottlenecks
> ------------------------------------
>
> Key: VELOCITY-606
> URL: https://issues.apache.org/jira/browse/VELOCITY-606
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.5
> Environment: Win XP, 1 Gb, single core, Maven 2, JUnitPerf, JRat,
> cached Velocity templates with a ClassLoader
> Reporter: Jarkko Viinamäki
> Attachments: velocity-1.5-250-threads-loadtest.PNG,
> velocity-1.5-50-threads-loadtest.PNG
>
>
> I did some quite extensive profiling to identify performance bottlenecks in
> Velocity 1.5.
> Using Maven 2, JUnitPerf and JRat I was able to identify these methods as top
> bottlenecks:
> org.apache.velocity.util.introspection ClassMap -
> findMethod(String,Object[])
> org.apache.velocity.util.introspection IntrospectorBase -
> getMethod(Class,String,Object[])
> org.apache.velocity.runtime.parser.node SimpleNode - literal()
> org.apache.velocity.runtime.parser.node SimpleNode -
> render(InternalContextAdapter,Writer)
> org.apache.commons.collections ExtendedProperties -
> getBoolean(String,boolean)
> org.apache.velocity.runtime.parser.node ASTReference -
> render(InternalContextAdapter,Writer)
> The first two eat over 50% of the CPU with many threads. See attached
> screenshots.
> Interestingly enough the synchronized
> org.apache.velocity.runtime RuntimeInstance getTemplate(String,String)
> isn't a big problem when templates are cached. However, if all resources are
> not cached it becomes a serious performance bottleneck. ResourceCacheImpl
> also uses a synchronized map which slows things down.
> I think these bottlenecks could be at least made less worse by reducing
> synchronization by using ConcurrentHashMap and StringBuilder that ship with
> JDK 1.5. I'm investigating what kind of benefits could be achieved with those.
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