Demystifying JVM Memory Management

Last updated Feb 2, 2023

• Jvm

Source: https://foojay.io/today/demystifying-jvm-memory-management/

• This is where JVM store dynamic data.
• Biggest block of memory area and this is where GC takes place.
• The size of heap memory can be controlled in Xms (Initial) and Xmx (max) flags.
• The entire heap memory is not committed to the Virtual Machine (VM) as some of it is reserved as virtual space and the heap can grow to use this.
• Divided into “Young” and “Old” generation.

• Also called “New Space”, this is where new objects live and further divided into “Eden Place” and “Survivor Space”.
• Managed by “Minor GC” or “Young GC”.
  • “Eden Space”: this is where new objects created. When we can create a new object, memory is allocated here.
  • “Survivor Space”: This is where objects that survived the minor GC are stored, divided in two halves, S0 and S1.