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With the default configuration, ActiveMQ is configured to use a dispatch thread per Queue - you can use set the optimizeDispatch optimizedDispatch property on the destination policy entry - see configuring Queues.
ActiveMQ can optionally use internally a thread pool to control dispatching of messages - but as a lot of deployment operating systems are good at handling a large number of threads, this is off by default. To enable this option, either set the ACTIVEMQ_OPTS to disable dedicated task runners in the start up script, INSTALL_DIR/bin/activemq -e.g.
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ACTIVEMQ_OPTS="-Xmx512M -Dorg.apache.activemq.UseDedicatedTaskRunner=false"
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