Yes, but the CHMs used in the nodes to hold children don't use the default 16 segments: | | // Less segments to save memory | children = new ConcurrentHashMap<Object, Node<K, V>>(4, .75f, 4); | Ah, but the LockMaps do!! Each LockMap - used to hold information on concurrent readers when using pessimistic locking - uses a ConcurrentHashSet, which is a wrapper around a CHM that implements Set. JBCACHE-1383 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4162486#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...