If "Calculate retained sizes" has not been enabled for the heap dump, the biggest objects view will not be available. For the "Calculate retained sizes" option to be effective, the "Perform full GC in heap dump" option has to be enabled for the heap dump as well.

Deselecting both these options speeds up the heap dump and uses less memory. The cost of this lower overhead includes the loss of the biggest objects view. By default, both options are are enabled.

The "Calculate retained sizes" option can be enabled in the

• heap walker options dialog, if the heap dump is taken manually.
• the configuration of the "Trigger heap dump" action, if the heap dump is taken by a trigger.
• the parameters passed to the triggerHeapDump method of the Controller class in the profiling API, if the heap dump is taken programatically.