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Information shown by ahat:

• The total bytes retained by heap.
• A list of root objects and their retained sizes for each heap.
• Information about each allocated object:
  • The allocation site (stack trace) of the object (if available).
  • The dominator path from a root to the object.
  • The class, (shallow) size, retained size, and heap of the object.
  • The bitmap image for the object if the object represents a bitmap.
  • The instance fields or array elements of the object.
  • The super class, class loader, and static fields of class objects.
  • Other objects with references to the object.
  • Other objects immediately dominated by the object.
• A list of objects, optionally filtered by class, allocation site, and/or heap.
• Information about each allocation site:
  • The stack trace for the allocation site.
  • The number of bytes allocated at the allocation site.
  • Child sites called from the allocation site.
  • The size and count of objects allocated at the site, organized by heap and object type.