Lars, That’s interesting. The code that computes that is simple:
final MemoryUsage usage = mxBean.getNonHeapMemoryUsage(); return Ratio.of(usage.getUsed(), usage.getMax()); So it’s getting a MemoryUsage object from the JVM and returning usage.getUsed() / usage.getMax(). But the documentation for MemoryUsage.getMax() state that if no maximum value has been set, it will return -1. So it looks like it means the non-heap usage is really 2.81816384E8 for you. So 281 MB. And there is no max value set. Thanks -Mark On Aug 4, 2021, at 1:19 PM, Lars Winderling <lars.winderl...@posteo.de<mailto:lars.winderl...@posteo.de>> wrote: Dear community, using the QueryNiFiReportingTask on NiFi:1.13.2 on java:8, debian:10, with G1 enabled as GC, I see something like this: "jvm_heap_used" : 4.26262096E8, "jvm_heap_usage" : 0.2646583418051402, "jvm_non_heap_usage" : -2.81816384E8, The non heap usage is negative by large. What does that mean? I can't seem to find any resources on the web, nor in the sources. Thanks in advance for your support! Best, Lars
