Heap settings

My servers have 188GB RAM. I initially set heap to 16GB

-Xms16g
-Xmx16g

Logs is showing:
[host04] heap size [15.8gb], compressed ordinary object pointers [true]

and

Heap address: 0x0000000400000000, size: 16384 MB, Compressed Oops mode: Zero based, Oop shift amount: 3

Do i need to adjust heap to 30G?

Here are the instruction for heap settings.

You most likely can increase your heap somewhere near 30GB for the exact value follow the instructions in the doc referenced above.