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Java VM and especially GC tuning, like Oracle DBA tuning, seems to be a black magic art few learn. I disliked XML configuration immensely, and have had some instances where (earlier, pre jdk11) JVM did not understand they had to introspect to be told how much memory they had (arguably the fault of the container/virtualisation they in turn sat inside)

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I still run all my PROD JVM applications with `-Xms=a -Xmx=a` to just remove all questions about heap memory. I already allocated that slice of the machine's memory for the application; I don't need the JVM trying to handle shrinking and growing it. This also removes pressure from the GC if the amount allocated is some multiple of typical operations. A lot more operations complete without ever leaving generation 0.

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