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I'm investigating big performance problems in my Hibernate + EHCache webapp. What happens is that after several runs of my benchmark scenario, the webapp becomes very slow and the number of requests per second drops dramatically.
When I monitor the application with Yourkit, I see that there is a very high contention in Hibernate ReadWriteCache. In fact, I've got a full dump where all threads are blocked in ReadWriteCache (put, lock or other methods) and the only running thread is in net.sf.ehcache.store.MemoryStore.findEvictionCandidate:
http-127.0.0.1-8080-Processor640 CPU time: 0:06
org.hibernate.cache.ReadWriteCache.afterInsert(Object, Object, Object)
In EHCache source code, I see that there is a special algorithm for cache with more than 100 entries, which is my case (200000 entries, no disk store).
Is it possible that this algorithm is slow in some cases?