Take a look at the HotSpot VM Options:
-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。)

博客介绍了HotSpot VM的垃圾回收选项,包括-XX:+UseParallelGC用于年轻代并行垃圾回收(1.4.1引入),-XX:+UseParallelOldGC用于全量并行垃圾回收(5.0 update 6引入),启用该选项会自动设置-XX:+UseParallelGC。
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