The difference between -XX: -UseParallelGC and -XX: + UseParallelGC

Question

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

Thank.

+5

xpapad Jun 18 '12 at 16:14

2 answers

Line:

-XX:+UseParallelGC

Includes ParallelGC . Pay attention to the sign.+

Line:

-XX:-UseParallelGC

Disables it. Pay attention to the sign -.

+3

Maurício Linhares Jun 18 '12 at 16:16

Makoto · Accepted Answer · 2012-06-18T16:16:21+0000

From the documentation:

Logical options are enabled with -XX:+<option>and disabled with-XX:-<option>

So, this means that it -XX:+UseParallelGCwill enable parallel garbage collection, and -XX:-UseParallelGCdisable it.