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Snailclimb merged 1 commit into from
Aug 23, 2020
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修改jvmParallel Scavenge垃圾收集器 #904

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10 changes: 10 additions & 0 deletions docs/java/jvm/JVM垃圾回收.md
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Expand Up @@ -392,6 +392,16 @@ Parallel Scavenge 收集器也是使用复制算法的多线程收集器，它
**新生代采用复制算法，老年代采用标记-整理算法。**
![Parallel Scavenge 收集器 ](./pictures/jvm垃圾回收/parllel-scavenge收集器.png)

**是JDK1.8默认收集器**
使用java -XX:+PrintCommandLineFlags -version命令查看

```
-XX:InitialHeapSize=262921408 -XX:MaxHeapSize=4206742528 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseParallelGC
java version "1.8.0_211"
Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)
```
JDK1.8默认使用的是Parallel Scavenge + Parallel Old，如果指定了-XX:+UseParallelGC参数，则默认指定了-XX:+UseParallelOldGC，可以使用-XX:-UseParallelOldGC来禁用该功能

### 4.4.Serial Old 收集器
**Serial 收集器的老年代版本**，它同样是一个单线程收集器。它主要有两大用途：一种用途是在 JDK1.5 以及以前的版本中与 Parallel Scavenge 收集器搭配使用，另一种用途是作为 CMS 收集器的后备方案。
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