Dear christopher.l.shannon Thanks for your quick reply.
I alocated 3GB memory for ActiveMQ. This is our startup setting for heap allocation. /usr/sbin/java -Xms3G -Xmx3G -XX:PermSize=256M -XX:MaxPermSize=256M And this is the systemUsage setting in activemq.xml <systemUsage> <systemUsage> <memoryUsage> <memoryUsage memoryUsage percentOfJvmHeap="70" /> </memoryUsage> <storeUsage> <storeUsage limit="100 gb" /> </storeUsage> <tempUsage> <tempUsage limit="50 gb" /> </tempUsage> </systemUsage> </systemUsage> Thanks! Hidekazu -- View this message in context: http://activemq.2283324.n4.nabble.com/AcativeMQ-becomes-slow-suddenly-in-60-minutes-after-starting-a-performance-test-tp4728103p4728185.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.