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A java app runs with the following flag: -XX:+PrintSafepointStatistics, and then
produces the following line on the standard output console:
2 VM operations coalesced during safepoint
Anyone cares to explain what this mean ?
More generally – is there a Java reference manual somewhere detailling all JVM flags, their use and, most importantly, the expected output, with relevant explanations ?
Here is a list of the possible VM operations.
This counter is incremented for each subsequent vm operation dealt with while the VM is at a safepoint, i.e. if 1 vm op is processed than it is not incremented, if 2 vm ops are processed it is incremented once, if 3 vm ops are processed it is incremented twice (etc etc).