Gašper Čefarin created ARTEMIS-5655:
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Summary: Reported AddressMemoryUsagePercentage values are over 100%
Key: ARTEMIS-5655
URL: https://issues.apache.org/jira/browse/ARTEMIS-5655
Project: ActiveMQ Artemis
Issue Type: Bug
Components: Broker, JMX
Affects Versions: 2.41.0
Reporter: Gašper Čefarin
JMX attribute AddressMemoryUsagePercentage shows over 100% when the address mem
usage is over JVM's global-max-size.
global-max-size is, by default, 1/2 of max JVM heap memory. It seems that
address mem usage can go beyond that.
I didn't 100% confirm this theory but it seems to be correct in my case.
Xmx is 1500MiB in my case, so global-max-size should be at 750MiB.
My address memory usage is at 1055.96 MiB, and AddressMemoryUsagePercentage is
at 140.80%.
Let's do some math ...
750MiB / 100 * 140.80 = 1056MiB
This is not a problem on console side, but on JMX side. This zabbix item,
{code:java}
jmx["org.apache.activemq.artemis:broker=\"{#JMXOBJ}\"",AddressMemoryUsagePercentage]{code}
which is monitoring the AddressMemoryUsagePercentage attribute, shows the same
values.
Since math is OK, I think the questions we should ask are:
Is global-max-size is OK for this purpose?
If not, what should the AddressMemoryUsagePercentage be calculated with?
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