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Keith Wall commented on QPID-7963: ---------------------------------- The heap becomes dominated by DirectByteBuffers and their QpidByteBuffers holders during the sending of the message to the client.The problem is the recursion in {{org.apache.qpid.server.protocol.v1_0.Session_1_0#sendTransfer}}. Each recursive call duplicates the every QBB in the payload, even those that have been already 'handled', so the number of QBBs/DBBs squares. We need to complete the TODO :). > [AMQP1.0] Sending a large message uses excessive heap memory > ------------------------------------------------------------ > > Key: QPID-7963 > URL: https://issues.apache.org/jira/browse/QPID-7963 > Project: Qpid > Issue Type: Bug > Components: Java Broker > Affects Versions: qpid-java-broker-7.0.0 > Reporter: Keith Wall > Attachments: AMQP1.0transientmessagestraverseheap.png > > > Examine heap usage whilst running a large transient message test, I see that > large AMQP 1.0 messages manifest fully on the heap whilst they traverse the > Broker. Neither AMQP 0-9 not AMQP 0-10 do this. > See attached jvisualvm screenshot. The spike at 3.17PM is a 300MB message > being produced/consumed. Later in the same test (same graph) a 750MB > message went over AMQP 0-9 and 0-10 messages with no discernible heap impact. > Command line was: > {{(export MAVEN_OPTS='-Xmx3g'; mvn package exec:java -f pom.xml > -Dstresstest=qpid-jms-client -Dexec.args='messagecount=1 size=300000000 > random=false jndiProperties=stress-test-client-qpid-jms-client.properties')}} > Java Broker running with out of the box memory settings with > {{-Dqpid.max_message_size=2000000000 -Dqpid.port.max_message_size=2000000000}} -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@qpid.apache.org For additional commands, e-mail: dev-h...@qpid.apache.org