Hello,
I'm facing some memory problems with ActiveMQ "Classic" 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 the topic:
* 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 ! [cid:image001.png@01DA172A.B30119B0]
Thanks in advance !
Nicolas Casaux
C2 - Usage restreint
