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G1 GC：什么是SATB缓冲区？

[英]G1 GC: What is SATB buffer?

原文 2017-02-13 10:12:03 8 2 java/ jvm/ g1gc

In Java 8 G1 GC , what is SATB buffer? 在Java 8 G1 GC ，什么是SATB缓冲区？

I saw this term in: http://www.oracle.com/technetwork/articles/java/g1gc-1984535.html 我在http://www.oracle.com/technetwork/articles/java/g1gc-1984535.html中看到了这个术语

After searching via Google, didn't found it's definition. 通过谷歌搜索后，没有找到它的定义。

Any help? 有帮助吗？ Thanks. 谢谢。

2 个解决方案

I assume it's a buffer for the 我认为这是一个缓冲区

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. G1 GC使用Snapshot-At-Beginning（SATB）算法，该算法在标记周期开始时获取堆中活动对象集的快照。

http://xiao-feng.blogspot.co.uk/2007/04/incremental-update-tracing-vs-snapshot.html 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/ https://rkennke.wordpress.com/2013/06/19/shenandoah-gc-concurrent-parallel-marking/

The document you are referring to says: 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. G1 GC使用Snapshot-At-Beginning（SATB）算法，该算法在标记周期开始时获取堆中活动对象集的快照。

So the logical conclusion would be: these buffers are used by that algorithm in order to store that snapshot. 因此，逻辑结论是：该算法使用这些缓冲区来存储该快照。