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https://issues.apache.org/jira/browse/ARTEMIS-5655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gašper Čefarin updated ARTEMIS-5655:
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Description:
JMX attribute AddressMemoryUsagePercentage shows over 100% when the address mem
usage is over JVM's global-max-size.
According to the broker's description of the attribute:
[AddressMemoryUsagePercentage is] Memory used by all the addresses on broker as
a percentage of the 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?
Edit:
There's one more thing.
The
was:
JMX attribute AddressMemoryUsagePercentage shows over 100% when the address mem
usage is over JVM's global-max-size.
According to the broker's description of the attribute:
[AddressMemoryUsagePercentage is] Memory used by all the addresses on broker as
a percentage of the 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?
> 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
> Priority: Minor
> Attachments: usedmem.png
>
>
> JMX attribute AddressMemoryUsagePercentage shows over 100% when the address
> mem usage is over JVM's global-max-size.
> According to the broker's description of the attribute:
> [AddressMemoryUsagePercentage is] Memory used by all the addresses on broker
> as a percentage of the 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?
> Edit:
> There's one more thing.
> The
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