Non zero resource cache size slower
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Key: VELOCITY-648
URL: https://issues.apache.org/jira/browse/VELOCITY-648
Project: Velocity
Issue Type: Improvement
Components: Engine
Reporter: Byron Foster
Fix For: 1.7
In performance testing I found that setting the
resource.manager.defaultcache.size property to 0 increases performance by about
30%. The reason for this is that when the cache size is set to 0 Velocity
uses the java.util.concurrent.ConcurrentHashMap container which provides better
thread concurrency. when the cache size is set to a non-zero value Velocity
uses the org.apache.commons.collections.map.LRUMap container, which provides
poor concurrency. The problem is that It's unclear if there is a container
that provides both good concurrency, and has a max size setting.
The default cache size is 89, which uses the slower LRUMap, and the end user is
non the wiser. The best solution would be to find a container that can be used
in both cases that performs as well as the ConcurrentHashMap, otherwise a
discussion in the documentation is probably warranted.
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