Example
Most JVMs have an option to set the maximum heap size e.g.
-Xmx64m
-Xmx8g
In Java 1.0 to 1.2 you could use
-mx64m
and this is still available on some JVMs for backward compatibility (E.g. Oracle JVM).
There are a few common misconceptions about this setting.
- It doesn't set the heap size, only the maximum.
-Xmssets the initial heap size. - It doesn't set the amount of memory the JVM will use. While the heap is an important area of memory, there are many other regions for code Perm Gen/Metaspace, thread stacks, GUI components, direct memory etc.
The amount of memory used at run time can change dynamically.
