For consistency with the pre-existing IGVPrintLevel compile command (and its associated PrintIdealGraphLevel flag), the PhasePrintLevel compile command should be active (i.e. produce output for the matched methods) when the flag PrintPhaseLevel gets its default value (0). However, running e.g.:

$ java -Xbatch -XX:CompileCommand=PhasePrintLevel,*::*,3

Does not produce any output, and it requires to be accompanied by -XX:PrintPhaseLevel=N where N > 0 to work.