Sebastian T created ARTEMIS-3117:
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Summary: Performance degradation when switching from JDK8 to 11
Key: ARTEMIS-3117
URL: https://issues.apache.org/jira/browse/ARTEMIS-3117
Project: ActiveMQ Artemis
Issue Type: Improvement
Components: Broker
Affects Versions: 2.16.0
Environment: Amazon Linux 2, Amazon Corretto (OpenJDK 11)
Reporter: Sebastian T
Attachments: image-2021-02-12-21-39-32-185.png,
image-2021-02-12-21-40-21-125.png, image-2021-02-12-21-44-26-271.png,
image-2021-02-12-21-46-52-006.png, image-2021-02-12-21-47-02-387.png,
image-2021-02-12-21-47-57-301.png
Since it was announced that probably Artemis 2.18.0 will require Java 11 we
upgraded the JVM of one of our broker clusters from OpenJDK 8 to OpenJDK 11 and
are seeing a noticable performance degradation which results in higher CPU
usage and higher latency.
We are monitoring request/reply round trip duration with a custom distributed
qpid-jms based healthcheck applications. Here is a graphic that shows the
effect when we switched the JDK:
!image-2021-02-12-21-39-32-185.png!
The broker itself is also monitored via Dynatrace, there I can see that after
upgrading to JDK 11 the broker process spend 22% of CPU time locking while in
JDK it only spent 3.5%.
*JDK 8:*
!image-2021-02-12-21-40-21-125.png!
*JDK 11:*
*!image-2021-02-12-21-44-26-271.png!*
*A method hotspot breakdown reveals this:*
!image-2021-02-12-21-47-02-387.png!
!image-2021-02-12-21-47-57-301.png!
Maybe I am misinterpreting the charts but the root cause seems to be somewhere
in {{org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1}}. I currently
cannot pinpoint the exact line number.
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