Dear James, Dear others,
I just get notice of this long thread. Sorry, if already give this suggestion.
But James: If it's possible, you may use (J)VisualVM with the "VisualGC" Plugin
to get some live impressions of "what's going on" with the heaps. To my
experience this visual perceptions is much easy to comprehend as a long list of
numbers.
If JMX is enabled to use remotely, you may even run the VisualVM-Tool on a
different machine.
Maybe some JVM-Options like
-XX:+PrintGCDetails
-XX:+PrintGCApplicationStoppedTime
-XX:+PrintAdaptiveSizePolicy
-XX:+PrintTenuringDistribution
-XX:+PrintStringDeduplicationStatistics
may help you to let write down a log of GC activities.
with greetings
Guido
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