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}}