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G1 being available is not the same as it being used automatically. Being available or enabled means that the -XX:+UseG1GC option is available for you if you choose to use it. To see your default java options, run "java -XX:+PrintCommandLineFlags -version" - the output can vary, e.g. a multicore server will have different values than a personal computer.1 person found this helpful
Thank you, sja.
I check my Server's default java options.
My server is Ubuntu 10.04 LTS 64bit and multicore CPU, but G1GC is not available at default.