java - Jmap does not report full memory usage of the JVM -

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i trying diagnose oom exception in process. using jmap , find not report full memory usage of jvm.

this output of jmap -histo:live (truncated):

num     #instances         #bytes  class name ----------------------------------------------    1:      36143828     1156602496  java.util.concurrent.concurrenthashmap$node    2:      36122540     1155921280  java.util.uuid    3:           195      268602800  [ljava.util.concurrent.concurrenthashmap$node;    4:          4207       11351968  [b    5:         38497        3231200  [c    6:         37708         904992  java.lang.string

adding above numbers memory usage in low 2gb's grafana dashboard showing memory usage of 16gb!

enter image description here

where missing memory (almost 12gb) going? how can details?


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