Problem with -XX:+UseG1GC

[Developer X]

 Hi.

If I use JDK 8 u45 with :

-Xms128m
-Xmx3g
-Xmn1g
-server
-XX:SurvivorRatio=1

then my Eden, Old, Survivor spases have a normal and true size.

If I add  -XX:+UseG1GC then all spase size changed. Why?
If it is associated with GC orgnomics then  -XX:±UseAdaptiveSizePolicy parameter not help Me.

Can I kill this problem?

Thanks.
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