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09_memory_footprint_boxed_vs_primitive.adoc

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Memory Footprint - Boxed vs. Primitive

Printing Memory Footprint using GraphLayout in JOL

 
System.out.println(GraphLayout.parseInstance(new MinMaxPrimitivesBoxed()).toFootprint());
System.out.println(GraphLayout.parseInstance(new MinMaxPrimitivesPlain()).toFootprint());

Output:

 
example.memory.boxing.MinMaxPrimitivesBoxed@5ea434c8d footprint:
     COUNT       AVG       SUM   DESCRIPTION
         1        80        80   example.memory.boxing.MinMaxPrimitivesBoxed
         2        16        32   java.lang.Boolean
         2        16        32   java.lang.Byte
         2        16        32   java.lang.Character
         2        24        48   java.lang.Double
         2        16        32   java.lang.Float
         2        16        32   java.lang.Integer
         2        24        48   java.lang.Long
         2        16        32   java.lang.Short
        17                 368   (total)

example.memory.boxing.MinMaxPrimitivesPlain@3514a4c0d footprint:
     COUNT       AVG       SUM   DESCRIPTION
         1        72        72   example.memory.boxing.MinMaxPrimitivesPlain
         1                  72   (total)

  • Recommendation: Don’t box primitive values! Autoboxing is evil and hides memory bloat!