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May 19, 2020 ·3 Using -XX:+UseParNewGC along with -XX:+UseConcMarkSweepGC, will cause higher pause time for Minor GCs, when compared to -XX:+UseParallelGC. This is because, promotion of objects from Young to Old Generation will require running a Best-Fit algorithm (due to old generation fragmentation) to find an address for this object. According to this blog entry: Note that with recent JVM versions -XX:+UseParNewGC is enabled automatically when -XX:+UseConcMarkSweepGC is set. As a consequence, if parallel young generation GC is not desired, it needs to be disabled by setting -XX:-UseParNewGC. For a concise summary of command line combinations, you might also be interested in this overview. Possible Duplicates: ".h or ".hpp for your class definitions What is the difference between .cc and .cpp file suffix? I used to think that it used to be that: .h files are header files for C and C... Feb 7, 2025 ·Error java.lang.StackOverflowError occur if I don't explicitly set -XX:ThreadStackSize. As I do some research, the default value of ThreadStackSize is 1024K without explicitly set it.