How much space does an object takes from the memory heap? How can this be done?
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How much space does an object takes from the memory heap? How can this be done?
This is far more complex than just using free memory computations (which don’t take into consideration garbage collections and new allocations by other threads). Take a look at:
http://www.javaspecialists.eu/archive/Issue142.html
This is advanced stuff, however.
–EDIT–
The solution above finds the deep size of an object (using a stack to traverse the reference network, a collection of visited references, and of course instrumentation).
However, getting the shallow size of an object is simpler, and can be achieved by java 1.5 instrumentation without extra work (see Instrumentation.getObjectSize()).