ncasaux created AMQ-9390:
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Summary: Incorrect memory percent usage ?
Key: AMQ-9390
URL: https://issues.apache.org/jira/browse/AMQ-9390
Project: ActiveMQ
Issue Type: Bug
Affects Versions: 5.17.6
Environment: Windows
Reporter: ncasaux
Attachments: image-2023-11-14-16-51-25-459.png,
image-2023-11-14-16-52-08-885.png
Hello,
I'm facing some memory problems with ActiveMQ with VirtualTopics and associated
queues.
My scenario is this:
* I'm using ActiveMQ 5.17.6 on windows
* I'm using vanilla config (so -Xms1G -Xmx1G)
* I have one virtual topic {{VirtualTopic.test}}
* I have 3 queues associated to it:
** {{Consumer.a.VirtualTopic.test}}
** {{Consumer.b.VirtualTopic.test}}
** {{Consumer.c.VirtualTopic.test}}
* I publish with JMeter 2000 messages without persistence with a 25 Ko payload
(which represent 25 Ko * 2000 = 50 Mo of data to store in the broker)
Expected results:
* The 3 queues are filled with 4000 messages each.
* The heap used on visualVM is roughly 80Mo after GC (I assume 50 Mo of
message + heap required by the broker)
* No store or temp is used.
* Memory limit in the broker shows 751619277 bytes (70% of 1Go)
Unexpected results:
* The MemoryPercentUsage shows 20% (which represents about 150 Mo)
I guess that this 150 Mo is the total (3 * 50 Mo) of the memory used by the 3
queues, but they actually store 3 times the same messages. And the Heap usage
(80 Mo) kind of proves it.
The real issue is that when I publish some more messages, the broker considers
very quickly that the memory used is falsely high, and then it starts some
persistence mechanism. And this problem obviously gets worst as I add more
queues to the virtual topic.
I hope it's clear enough ! I added some screenshots if it can help :)
Thanks in advance !
!image-2023-11-14-16-51-25-459.png|width=945,height=355!
!image-2023-11-14-16-52-08-885.png!
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