JVM的SurvivorRatio标志不起作用？

Question

The document from Oracle writes "The SurvivorRatio parameter controls the size of the two survivor spaces. For example, -XX:SurvivorRatio=6 sets the ratio between each survivor space and eden to be 1:6, each survivor space will be one eighth of the young generation", but it does not work in my case below.

The JVM Flags I set:

The JVM heap infomation:

The gcutil output every 1 second:

Here are the questions:

1. From Space capacity : Eden Space capacity = 4.5 : 824.5 which is not 1:6, so where is wrong?
2. Why the switch between S0U and S1U changes (Minor GC) so frequently which causes high cpu load.

Answer 1

I solved it!

-XX:+UseAdaptiveSizePolicy is enabled by default, and is incompatible with -XX:SurvivorRatio=n . After when I used -XX:-UseAdaptiveSizePolicy to disable adaptive size policy, it works now.