Java -XX:+UseConcMarkSweepGC（默认年轻代收集器是什么？）
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-XX:+UseConcMarkSweepGC (what is default young generation collector?)
提问by Anton Kasianchuk
As far as I know we can run JVM with the next options:
据我所知，我们可以使用以下选项运行 JVM：
-XX:+UseConcMarkSweepGC
-XX:-UseParNewGC
in this case we will have the Serial (DefNew)garbage collector for the young generation and the Concurrent Mark Sweepgarbage collector for the old generation.
在这种情况下，我们将为年轻代使用串行（DefNew）垃圾收集器，为年老代使用并发标记扫描垃圾收集器。
Well, can we run JVM with -XX:+UseConcMarkSweepGCoption only? I mean without any options that describes a garbage collector for the young generation. If we can do that, which garbage collector will be used for the old generation?
那么，我们-XX:+UseConcMarkSweepGC可以只用选项运行 JVM吗？我的意思是没有任何描述年轻代垃圾收集器的选项。如果可以的话，老年代会使用哪个垃圾回收器？
采纳答案by Rafael Winterhalter
According to this blog entry:
根据此博客条目：
Note that with recent JVM versions
-XX:+UseParNewGCis enabled automatically when-XX:+UseConcMarkSweepGCis set. As a consequence, if parallel young generation GC is not desired, it needs to be disabled by setting-XX:-UseParNewGC.
请注意，使用最新的 JVM 版本
-XX:+UseParNewGC会在-XX:+UseConcMarkSweepGC设置时自动启用。因此，如果不需要并行年轻代 GC，则需要通过设置禁用它-XX:-UseParNewGC。
For a concise summary of command line combinations, you might also be interested in this overview.
有关命令行组合的简明摘要，您可能还对本概述感兴趣。
