John Fingerhut <[email protected]> writes:
> Does anyone know a way from within a Java/Clojure program to determine
> which GC algorithm is currently in use? I'm curious what the default
> is when one is not specified on the command line, and accessing the
> one being used from inside of a program would be one good way to find
> out for sure. There doesn't seem to be anything returned by
> Runtime.getRuntime().getProperties() to indicate that.
You can get at least something via JMX:
(require '[clojure.contrib.jmx :as jmx])
(map #(subs (str %) 37)
(jmx/mbean-names "java.lang:type=GarbageCollector,*"))
Default on my PC: ("PS MarkSweep" "PS Scavenge")
With -XX:-UseParallelGC: ("Copy" "MarkSweepCompact")
With -XX:+UseG1GC: ("G1 Old Generation" "G1 Young Generation")
You can also see this same data by running JConsole (shipped in the
JDK's bin directory) and attaching to a running Java process.
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