怎么看堆的存活对象占比超过百分之50，才能启用G1

Question

怎么看堆的存活对象占比超过百分之50，才能启用G1

Answer 1

若鱼1919 2019-11-05 13:00:28

Applications running today with either the CMS or the with parallel compaction would benefit from switching to G1 if the application has one or more of the following traits.

More than 50% of the Java heap is occupied with live data.

The rate of object allocation rate or promotion varies significantly.

The application is experiencing undesired long garbage collection or compaction pauses (longer than 0.5 to 1 second).

没有说只有超过50%才可以启用