1 Reply Latest reply on Oct 10, 2003 5:16 AM by Adrian Brock

    CurrentMemoryUsage attribute of MessageCache MBean increases

    Nigel Birch Newbie

      Hi,

      Using JBossMQ in JBoss3.0.8 on Linux.

      I have a system that uses a variety of Queues and Topics, with durable and non-durable subscriptions. The heap usage of JBoss as a whole increases over time, and I'm wondering if it may be occuring in JBossMQ....

      I'm observing the CurrentMemoryUsage attribute of the MessageCache MBean using the JMX-Console.
      The value of this attribute will oscillate following a sawtooth pattern. It starts at ~20 and increases to ~50 over a 30 second period, and drops down to ~20 again. I presume this is normal behavior. After 9 days of moderate JMS bus usage the value of CurrentMemoryUsage cycles from ~90 to ~120.

      Other MessageCache MBean attribute values (after 9 days runtime):
      TotalCacheSize = 0
      SoftRefCacheSize = 0
      SoftenedSize = 1
      HardRefCacheSize = 0
      CacheHits = 213979
      CacheMisses = 0

      Does the increase in CurrentMemoryUsage point to messages being retained? The durable subscriptions are not persisting any messages in the persistent store (file based).

      Any suggestions would be greatly appreciated.

      Thanks
      NBirch