2016-02-16 19:27:52 +00:00
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# jmap
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2022-10-11 03:59:50 +01:00
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> Java memory map tool.
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2023-06-04 02:48:54 +01:00
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> More information: <https://docs.oracle.com/en/java/javase/20/docs/specs/man/jmap.html>.
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2016-02-16 19:27:52 +00:00
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2021-07-13 09:59:48 +01:00
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- Print shared object mappings for a Java process (output like pmap):
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2016-02-16 19:27:52 +00:00
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`jmap {{java_pid}}`
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- Print heap summary information:
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2016-02-16 20:36:36 +00:00
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`jmap -heap {{filename.jar}} {{java_pid}}`
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2016-02-16 19:27:52 +00:00
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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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2022-12-06 06:47:56 +00:00
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`jmap -dump:format=b,file={{path/to/file}} {{java_pid}}`
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2023-02-19 13:30:53 +00:00
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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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