G1 GC：什么是 SATB 缓冲区？

Question

在Java8G1 GC中，什么是SATB缓冲区？

我在以下位置看到了这个词：http://www.oracle.com/technetwork/articles/java/g1gc-1984535.html

通过Google搜索后，没有找到它的定义。

有什么帮助吗？谢谢

Answer 1

我假设它是

的缓冲区

G1 GC uses the Snapshot-At-The-Beginning (SATB) algorithm, which takes a snapshot of the set of live objects in the heap at the start of a marking cycle.

http://xiao-feng.blogspot.co.uk/2007/04/incremental-update-tracing-vs-snapshot.html

https://rkennke.wordpress.com/2013/06/19/shenandoah-gc-concurrent-parallel-marking/

Answer 2

您所指的文件说：

G1 GC uses the Snapshot-At-The-Beginning (SATB) algorithm, which takes a snapshot of the set of live objects in the heap at the start of a marking cycle.

因此合乎逻辑的结论是：该算法使用这些缓冲区来存储该快照。