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30 lines
725 B
Plaintext
30 lines
725 B
Plaintext
---
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syntax: markdown
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tags: [tldr, common]
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source: https://github.com/tldr-pages/tldr.git
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---
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# jmap
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> Java memory map tool.
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> More information: <https://docs.oracle.com/en/java/javase/25/docs/specs/man/jmap.html>.
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- Print shared object mappings for a Java process (output like pmap):
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`jmap {{java_pid}}`
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- Print heap summary information:
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`jmap -heap {{filename.jar}} {{java_pid}}`
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- Print histogram of heap usage by type:
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`jmap -histo {{java_pid}}`
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- Dump contents of the heap into a binary file for analysis with jhat:
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`jmap -dump:format=b,file={{path/to/file}} {{java_pid}}`
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- Dump live objects of the heap into a binary file for analysis with jhat:
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`jmap -dump:live,format=b,file={{path/to/file}} {{java_pid}}`
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