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javajvm-arguments

Difference between -XX:-UseParallelGC and -XX:+UseParallelGC

What is the difference between -XX:+UseParallelGC and -XX:-UseParallelGC? Most links indicate the first, but http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html mentions the second.

Thank you.

Solution

  • From the documentation:

    Boolean options are turned on with -XX:+<option> and turned off with -XX:-<option>

    So it means that -XX:+UseParallelGC will turn on the parallel garbage collection, and -XX:-UseParallelGC will turn it off.