tldr/pages/common/jmap.md

# 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}}`
Java debug tools. Jstack, jmap and jhat. 2016-02-16 11:27:52 -08:00			`# jmap`

			`> Java Memory Map Tool.`

			`- Print shared object mappings for a java process (output like pmap):`

			`jmap {{java_pid}}`

			`- Print heap summary information:`

Copy pasta oopsies. 2016-02-16 12:36:36 -08:00			`jmap -heap {{filename.jar}} {{java_pid}}`
Java debug tools. Jstack, jmap and jhat. 2016-02-16 11:27:52 -08:00
			`- 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}}`