java - G1 垃圾收集器是否对每个区域使用相同的区域大小？

Question

甲骨文的Getting Started with the G1 Garbage Collector教程介绍了以下有关 G1 垃圾收集器的区域大小的信息:

The heap is one memory area split into many fixed sized regions.

[...]

Region size is chosen by the JVM at startup. The JVM generally targets around 2000 regions varying in size from 1 to 32Mb.

尚不清楚 JVM 中是否所有区域都具有相同的大小，或者可能存在不同大小的区域(例如，1500 个大小为 1MB 的区域和 500 个大小为 2MB 的区域)。

Answer 1

是的，这些区域大小相等。文章Garbage First Garbage Collector Tuning说:

The G1 GC is a regionalized and generational garbage collector, which means that the Java object heap (heap) is divided into a number of equally sized regions.

JVM 的目标是创建大约 2000 个区域。它们的实际大小取决于您的最小堆大小。