Disclaimer before reading this: This is a tuning issue and not a performance problem with ActiveMQ.
Description of the issue: I believe I have a tuning problem with ActiveMQ 6.1.5 on Rocky Linux 9.5 running on a virtual machine with 8 vCPUs and 32GB of RAM. The underlying disk is attached SSD. I am using the ActiveMQ Classic Performance Module: https://activemq.apache.org/components/classic/documentation/activemq-classic-performance-module-users-manual I am running the broker and the producer on separate virtual machine instances. The producer is running on a 12 vCPU host. The broker and producer VM instances are on the same VLAN. 2 scenarios: 1) Running a 5 minute test with 25 producer threads with 1K payloads on a set of 50 queues I observed that I averaged about 1700 transactions/messages per second using the producer provided with the plugin. 2) Running a 5 minute test with 25 producer threads with 1MB payloads on a set of 50 queues I observed that I averaged about 19 transactions/messages per second using the producer provided with the plugin. I really expected the throughput to be a lot more than what I am seeing. The CPU utilization stays around 10-11% and there is plenty of free memory. I did notice the disk saturation can get up to 80-90% during a test with write activity. I am using the out of the box settings for the systemUsage segment in activemq.xml which is 70% of the heap for memoryUsage, 100GB storeUsage, and 50GB of tempUsage. I am going to try the same tests with the following settings: On the broker: Turning off journalDiskSyncStrategy (which I am not a real fan of doing): journalDiskSyncStrategy=”never” On the producer client running the Maven plugin: factory.optimizeAcknowledge=true factory.alwaysSessionAsync=false factory.prefetchPolicy.queuePrefetch=2000 factory.prefetchPolicy.queueBrowserPrefetch=1000 factory.useAsyncSend=true Is there anything I am forgetting to increase throughput? I feel like I am leaving something silly out. Regards, William Crowell This e-mail may contain information that is privileged or confidential. If you are not the intended recipient, please delete the e-mail and any attachments and notify us immediately.
