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Asked: 2026-05-27T21:46:11+00:00

I’ve done some search out there but couldn’t find too much really helpful info

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I’ve done some search out there but couldn’t find too much really helpful info on it, but could someone try to explain the basic of Java memory maps? Like where/how to use it, it’s purpose, and maybe some syntax examples (inputs/outputs types)? I’m taking a Java test soon and this could be one of the topics, but through all of my tutorials Jmap has not come up. Thanks in advance

Edit: I’m referring to the tool: jmap

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  1. Editorial Team

    I would read the man page you have referenced.

    jmap prints shared object memory maps or heap memory details of a given process or core file or a remote debug server.

    NOTE: This utility is unsupported and may or may not be available in future versions of the JDK. In Windows Systems where dbgeng.dll is not present, ‘Debugging Tools For Windows’ needs to be installed to have these tools working. Also, PATH environment variable should contain the location of jvm.dll used by the target process or the location from which the Crash Dump file was produced.

    http://docs.oracle.com/javase/7/docs/technotes/tools/share/jmap.html

    Its not a tool to be played with lightly. You need a good profiler which can read it output as jhat is only useful for trivial programs. (YourKit works just fine for 1+ GB heaps)

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