Difference between PermGen Space and MetaSpace.

Question

Difference between PermGen Space and MetaSpace.

JavaServer Side ProgrammingProgramming

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PermGen is the memory area for storing class data like static variable,byte code and etc. By default 64 Mb is allocated for PermGen. It can be tuned by using -XXMaxPermSize.

In Java 8, PermGen method area replaced with MetaSpace. They have moved permGem to the separate memory in the native OS and that is called MetaSpace. It can by default auto increases its size. In MetaSpace, classes can load and unload during the lifespan of the JVM.

Sr. No.	Key	PermGen	MetaSpace
1	Basic	PermGen is the memory area for storing class data like static variable,byte code and etc	In Java 8, PermGen method area replaced with MetaSpace
2	Default Memory Allocation	By default 64 Mb is allocated for PermGen	It can by default auto increases its size
3	Tuned-up Memory Flag	It can be tuned by using -XXMaxPermSize.	We can restrict upper bound of the memory by -XX:MaxMetaspaceSize
4	Memory Area	It is a special Heap space.	Since Java 8, It is now separate memory area  in the native OS

Himanshu shriv

Published on 09-Sep-2020 14:58:09

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