mirror of https://github.com/CrimsonTome/tldr.git
25 lines
632 B
Markdown
25 lines
632 B
Markdown
# jmap
|
|
|
|
> Java memory map tool.
|
|
> More information: <https://docs.oracle.com/en/java/javase/20/docs/specs/man/jmap.html>.
|
|
|
|
- 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={{path/to/file}} {{java_pid}}`
|
|
|
|
- Dump live objects of the heap into a binary file for analysis with jhat:
|
|
|
|
`jmap -dump:live,format=b,file={{path/to/file}} {{java_pid}}`
|