jmap Java Memory Map Tool. 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={{filename}} {{java_pid}}