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https://issues.apache.org/jira/browse/AMQ-9390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17786002#comment-17786002
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ncasaux commented on AMQ-9390:
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Hello [~jbertram] ,
I guess you're right, I wanted to be sure to have a proper layout to introduce
the issue.
I'll send a message to the user list.
> 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
> Priority: Major
> 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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