jmap [ options ] pid // local process jmap [ options ] executable core // core file jmap [ options ] [process-name@]hostname // remote process
jmap prints memory usage information for a local or remote Java process or a Java core file. Depending on the option it is invoked with, jmap displays one of four memory usage reports. See the Options section for details. jmap can be started in three ways:
In Java 5.0, jmap is experimental, unsupported, and not available on all platforms.
When invoked with no options, jmap prints a memory map of the shared objects or libraries loaded by the VM. Other reports can be produced by using the options below. These options are mutually exclusive; only one may be specified.