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Take a look at the :

-XX:+UseParallelGC = Use parallel garbage collection for scavenges. (Introduced in 1.4.1).

-XX:+UseParallelOldGC = Use parallel garbage collection for the full collections. Enabling this option automatically sets -XX:+UseParallelGC. (Introduced in 5.0 update 6.)

where Scavenges = Young generation GC.（其中 Scavenges = 年轻代 GC。）

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