"keep only a few private fields, 2 ints + 2 longs + 2 object references (Unsafe and a hash function), for the duration of the instance. The rest are short lived or managed off-heap. / BOHMap must do more work than the standard HashMap, since it needs to copy data between on-heap and off-heap memory"
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Only the Good Die Young (or Move Off-heap?) | Blog of Christian Felde
OpenJDK and HashMap …. Safely Teaching an Old Dog New (Off-Heap!) Tricks
