Java two memory Parameter options

Xmx is a Java option that is used to set the maximum memory size that your application can use (optimistic, so that your application is not the entire JVM ), if your program requires a large amount of memory, you need to modify the default settings. For example, when configuring tomcat, if the traffic is too large, you need to increase the value, but remember, do not exceed the memory size of your machine, so that your machine will not be able to stand it, and then it will die.
XMS is another parameter for setting memory. It is used to set the size of the memory stack during program initialization. If this value is increased, the Startup Performance of your program will be improved. However, there are also restrictions and xmx restrictions.