java - Heap memory vs object memory -

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according paper java memory , characteristics:

"... the memory score partitions 2 types: heap memory, memory consumed application during runtime, , object memory, memory allocated various objects used in program, such integers , strings, etc. ..."

do mean stack memory when object memory, or mean? (confused since, if not wrong, objects allocated in heap in java)

second question, if want measure total size of heap , stack during full program execution, tool should use? have been looking around , tried out built-in java profiler in netbeans 7.3.1 , yourkit 12.0.6, able inspect heap when comes studying "objects" , variables placed on stack, can not find way!

to sum up, how measure paper describing:

  • total heap memory used
  • total object memory used

thanks!

heap memory : storage java objects. when use new keyword create instance of class.

stack memory : used store local variables, method call, etc. jvm can decide , use store objects performance.

to get, total memory used-

usedmemory = runtime.getruntime().totalmemory() - runtime.getruntime().freememory();

you cannot stack memory on runtime can start app predefined stack size depends on platform.

there's non-heap memory think defined object memory used store loaded classes..metadata, etc.

references:

memorymxbean

jconsole


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