java - Heap dump's total size more than the used heap/perm gem -

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i'm analyzing memory usage of tool using visualvm + visualgc. noticed wasn't expecting exposes misunderstanding of mine concerning jvm , heap dumps.

to give full context, application profiling lookup of huge blob of serialized printing size of using jamm. after that, app sits there , waits until aborted.

using visualvm, see heap usage growing expected. once operation complete , app sitting there sleeping, trigger gc (or rather, multiple gcs, carried away clicking button) using visualvm.

  • the used heap @ point 1,849,825,472 bytes , permgem used space 25,864,448 bytes.

  • at point, perform heap dump takes while but, when heap dump completes, used heap still 1,944,542,296 bytes permgen same @ 25,892,800 bytes.

  • here's punch: heap dump shows total bytes count of 2,299,816,089.

what explain such discrepancy? repeated experiments few times , i'm getting same results.


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