You use the
jmap command to print shared object memory maps or heap memory details of a specified process or a remote debug server. This command is experimental and unsupported.
jmap [options] pid
jmap command prints shared object memory maps or heap memory details of a specified process or remote debug server.
This command is unsupported and might not be available in future releases of the JDK. On Windows Systems where the
dbgeng.dll file isn’t present, Debugging Tools for Windows must be installed to make these tools work. The
PATH environment variable should contain the location of the
jvm.dll file that’s used by the target process or the location from which the coredump file was produced.
Options for the jmap Command
Connects to a running process and prints class loader statistics of Java heap.
Connects to a running process and prints information on objects awaiting finalization.
Connects to a running process and prints a histogram of the Java object heap. If the
live suboption is specified, it then counts only live objects.
-dump:dump options pid
Connects to a running process and dumps Java heap. The
dump options include:
live — When specified, dump only the live objects; if not specified, then dump all objects in the heap.
format=b — Dumps the Java heap,. in
hprof binary format
file=filename — Dumps the heap to filename
jmap -dump:live,format=b,file=heap.bin pid