Name
jmap - print details of a specified process
Synopsis
Note: This command is experimental and unsupported.
jmap
[options] pid
- options
-
This represents the
jmap
command-line options. See Options for the jmap Command. - pid
-
The process ID for which the information specified by the
options is to be printed. The process must be a Java process.
To get a list of Java processes running on a machine, use either the
ps
command or, if the JVM processes are not running in a separate docker instance, the jps command.
Description
The jmap
command prints details of a specified running
process.
Note:
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, the 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 core dump file was produced.
Options for the jmap Command
-clstats
pid- Connects to a running process and prints class loader statistics of Java heap.
-finalizerinfo
pid- Connects to a running process and prints information on objects awaiting finalization.
-histo
[:live
] pid-
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 the Java heap. The dump_options include:
live
--- When specified, dumps only the live objects; if not specified, then dumps all objects in the heap.format=b
--- Dumps the Java heap inhprof
binary formatfile=
filename --- Dumps the heap to filename
Example:
jmap -dump:live,format=b,file=heap.bin
pid