디폴트 Xmx Xms 확인

You can use the following command to find out the defaults on the system where your applications runs.

java -XX:+PrintFlagsFinal -version

Look for the options MaxHeapSize (for -Xmx) and InitialHeapSize for -Xms.

On a Unix/Linux system, you can do

java -XX:+PrintFlagsFinal -version | grep HeapSize