https://jira.opendaylight.org This file is an XML representation of an issue en-us 8.20.10 820010 22-06-2022 https://jira.opendaylight.org/browse/INFRAUTILS-20 infrautils <p>while researching around <a href="https://jira.opendaylight.org/browse/NETVIRT-974" title="karaf process killed by OS due to OOM condition" class="issue-link" data-issue-key="NETVIRT-974">NETVIRT-974</a>, I stumbled upon some blog posts mentioning how a JVM's native memory usage can be monitored. I believe it would be useful to have a small utility (in infrautils) which uses the respective Java API, and exposes this e.g. by JMX and CLI, incl. with regular dumping.</p> <p>I'll use <a href="https://jira.opendaylight.org/browse/INFRAUTILS-19" title="Coda Hale Dropwizard Metrics integration" class="issue-link" data-issue-key="INFRAUTILS-19"><del>INFRAUTILS-19</del></a> Metrics for this.</p> INFRAUTILS-20

Monitorability of JVM's native memory usage

New Feature Medium Resolved Won't Do Unassigned Michael Vorburger Fri, 3 Nov 2017 15:37:59 +0000 Fri, 24 Sep 2021 18:50:55 +0000 Fri, 24 Sep 2021 18:50:55 +0000 0 0 <p><a href="https://git.opendaylight.org/gerrit/#/c/66689/" class="external-link" target="_blank" rel="nofollow noopener">I'm currently adding BufferPoolMetricSet and MemoryUsageGaugeSet to infrautils.metrics</a> and it seems this will gives us something related to this, but we would need the options below enabled on start-up, which is probably a bad idea to enable by default because <em>"note that enabling this will cause 5-10% performance overhead"</em> ...</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java">-XX:NativeMemoryTracking=[off | summary | detail] -XX:+UnlockDiagnosticVMOptions -XX:+PrintNMTStatistics</pre> </div></div> <p>so I'm un-assigning myself from this issue as I don't plan to go beyond what I'm doing today in infrautils.metrics; if we suspect native memory problems in the future based on what we'll find in metrics, then we can add the JVM startup options above during lab testing to find out more.</p> <p>The JVM already provides a ton of metrics via JMX without the need for any code on our part. Even more JVM-related things are available through Java Flight Recorder, so this really is about knowing how to deploy Java applications.</p> Blocks NETVIRT-977 INFRAUTILS-19 Development Rank 0|i0377r: