Hi, I'm currently fighting a bit with having 5000+ topics and persistence enabled for an ActiveMQ 5.3 Broker. In fact, in this scenario is not a problem with persistence is switched off. The broker has no problems (well if you give him enough memory, say >1Gb) to handle all the topics even when advisory topics are switched on.
Now, my first question: If I just create an amqPersistenceAdapter adapter which is referenced by the broker but don't enable persistence (persistence="false"), already files are created in the data directory. What exactly is stored here? Secondly, if I finally do enable persistence the number of threads equals more or less the number of topics I created (2000Topics -> 2086 threads). I imagine that for each Thread a "persistence thread" is created. Is this correct ? If so, how can I disable this behavior (e.g. like the -Dorg.apache.activemq.UseDedicatedTaskRunner=false). As soon as I try to create >3000 topics, the broker throws OOME when creating a new thread and even dies rapidly after a while. However, the heap memory usage does not exceed the Xmx limit (1400GB) but stays calm at 300M The Test Scenario: 40 Connections to Broker, sharing 20.000 Subscriptions on 5000 Topics ( each topic is subscribed 4 times, each connection keeps 500 MessageListeners. Sessions are created with DUPS_OK and messages are send in NON_PERSISTENCE mode. This is the connection parameters for the clients: jms.copyMessageOnSend=false&jms.dispatchAsync=false&wireformat.tcpNoDelayEnabled=true&wireFormat.maxInactivityDuration=10000&wireFormat.tightEncodingEnabled=false&jms.optimizedDispatch=true I've also attached the Broker configuration. Maybe I understood this wrong, but if I want the Broker to swap messages to disk whenever memory becomes full I have to enable persistence on the broker side. This is independent from the message, isn't it ? I'd be very glad, if someone can help me here to understand and solve this problem. Thanks a lot, Felix p.s. In general I found this documentation quite useful : http://fusesource.com/wiki/display/ProdInfo/Understanding+the+Threads+Allocated+in+ActiveMQ. http://www.nabble.com/file/p24181021/activemq.xml activemq.xml -- View this message in context: http://www.nabble.com/ActiveMQ-Thread-Management-tp24181021p24181021.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.
