tldr/pages/common/jmap.md
2016-02-16 12:36:36 -08:00

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# jmap
> Java Memory Map Tool.
- Print shared object mappings for a java process (output like pmap):
`jmap {{java_pid}}`
- Print heap summary information:
`jmap -heap {{filename.jar}} {{java_pid}}`
- Print histogram of heap usage by type:
`jmap -histo {{java_pid}}`
- Dump contents of the heap into a binary file for analysis with jhat:
`jmap -dump:format=b,file={{filename}} {{java_pid}}`