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Understanding Survival Generation

The Netbeans memory monitoring tool (which is actually the built-in VisualVm tool that VisualVm does) has an interesting metric for tracking memory leaks: a label for surviving generations.

A definition of this indicator can be found at oracle.com:

  • Generation is a collection of instances created within the same GC interval (between two garbage collections)
  • A surviving generation is a generation that survives in at least one garbage collection. The number of surviving garbage collectors - the age of generations - is its unique identifier.
  • The value of surviving generations (metrics) is the number of different surviving generations that are currently alive on the heap (number of generations with different generations)

I have a question about the second definition. I know what this means for an instance to survive in the garbage collection. But I'm not sure what it means for a generation to survive in a garbage collection. Does this mean that at least one generation instance survives in garbage collection?

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Yes. This basically means that among the instances that were created between garbage collectors X and X + 1, there are some that are now alive when more garbage collects occur.

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