This article here suggest to use -XX:+UseParNewGC ‘To enable a parallel young generation GC with the concurrent GC’.

http://www.petefreitag.com/articles/gctuning/

http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html

http://www.tikalk.com/java/garbage-collection-serial-vs-parallel-vs-concurrent-mark-sweep

http://stackoverflow.com/questions/198431/how-do-you-compare-two-version-strings-in-java

how to get thread dump from command line
jstack

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