JDK14/Java14源码在线阅读

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.TH "JHSDB" "1" "2020" "JDK 14" "JDK Commands"
.hy
.SH NAME
.PP
jhsdb \- attach to a Java process or launch a postmortem debugger to
analyze the content of a core dump from a crashed Java Virtual Machine
(JVM)
.SH SYNOPSIS
.PP
\f[CB]jhsdb\f[R] \f[CB]clhsdb\f[R] [\f[CB]\-\-pid\f[R] \f[I]pid\f[R] |
\f[CB]\-\-exe\f[R] \f[I]executable\f[R] \f[CB]\-\-core\f[R]
\f[I]coredump\f[R]]
.PP
\f[CB]jhsdb\f[R] \f[CB]hsdb\f[R] [\f[CB]\-\-pid\f[R] \f[I]pid\f[R] |
\f[CB]\-\-exe\f[R] \f[I]executable\f[R] \f[CB]\-\-core\f[R]
\f[I]coredump\f[R]]
.PP
\f[CB]jhsdb\f[R] \f[CB]debugd\f[R] (\f[CB]\-\-pid\f[R] \f[I]pid\f[R] |
\f[CB]\-\-exe\f[R] \f[I]executable\f[R] \f[CB]\-\-core\f[R]
\f[I]coredump\f[R]) [\f[I]options\f[R]]
.PP
\f[CB]jhsdb\f[R] \f[CB]jstack\f[R] (\f[CB]\-\-pid\f[R] \f[I]pid\f[R] |
\f[CB]\-\-exe\f[R] \f[I]executable\f[R] \f[CB]\-\-core\f[R] \f[I]coredump\f[R]
| \f[CB]\-\-connect\f[R] \f[I][server\-id\@]debugd\-host\f[R])
[\f[I]options\f[R]]
.PP
\f[CB]jhsdb\f[R] \f[CB]jmap\f[R] (\f[CB]\-\-pid\f[R] \f[I]pid\f[R] |
\f[CB]\-\-exe\f[R] \f[I]executable\f[R] \f[CB]\-\-core\f[R] \f[I]coredump\f[R]
| \f[CB]\-\-connect\f[R] \f[I][server\-id\@]debugd\-host\f[R])
[\f[I]options\f[R]]
.PP
\f[CB]jhsdb\f[R] \f[CB]jinfo\f[R] (\f[CB]\-\-pid\f[R] \f[I]pid\f[R] |
\f[CB]\-\-exe\f[R] \f[I]executable\f[R] \f[CB]\-\-core\f[R] \f[I]coredump\f[R]
| \f[CB]\-\-connect\f[R] \f[I][server\-id\@]debugd\-host\f[R])
[\f[I]options\f[R]]
.PP
\f[CB]jhsdb\f[R] \f[CB]jsnap\f[R] (\f[CB]\-\-pid\f[R] \f[I]pid\f[R] |
\f[CB]\-\-exe\f[R] \f[I]executable\f[R] \f[CB]\-\-core\f[R] \f[I]coredump\f[R]
| \f[CB]\-\-connect\f[R] \f[I][server\-id\@]debugd\-host\f[R])
[\f[I]options\f[R]]
.TP
.B \f[I]pid\f[R]
The process ID to which the \f[CB]jhsdb\f[R] tool should attach.
The process must be a Java process.
To get a list of Java processes running on a machine, use the
\f[CB]ps\f[R] command or, if the JVM processes are not running in a
separate docker instance, the \f[B]jps\f[R] command.
.RS
.PP
\f[B]Note:\f[R] JDK 10 has added support for using the Attach API when
attaching to Java processes running in a separate docker process.
However, the \f[CB]jps\f[R] command will not list the JVM processes that
are running in a separate docker instance.
If you are trying to connect a Linux host with a Virtual Machine that is
in a docker container, you must use tools such as \f[CB]ps\f[R] to look up
the PID of the JVM.
.RE
.TP
.B \f[I]executable\f[R]
The Java executable file from which the core dump was produced.
.RS
.RE
.TP
.B \f[I]coredump\f[R]
The core file to which the \f[CB]jhsdb\f[R] tool should attach.
.RS
.RE
.TP
.B \f[I][server\-id\@]debugd\-host\f[R]
An optional server ID and the address of the remote debug server
(debugd).
.RS
.RE
.TP
.B \f[I]options\f[R]
The command\-line options for a \f[CB]jhsdb\f[R] mode.
See \f[B]Options for the debugd Mode\f[R], \f[B]Options for the jstack
Mode\f[R], \f[B]Options for the jmap Mode\f[R], \f[B]Options for the jinfo
Mode\f[R], and \f[B]Options for the jsnap Mode\f[R].
.RS
.RE
.PP
\f[B]Note:\f[R]
.PP
Either the \f[I]pid\f[R] or the pair of \f[I]executable\f[R] and
\f[I]core\f[R] files or the \f[I][server\-id\@]debugd\-host\f[R] must be
provided for \f[CB]debugd\f[R], \f[CB]jstack\f[R], \f[CB]jmap\f[R],
\f[CB]jinfo\f[R] and \f[CB]jsnap\f[R] modes.
.SH DESCRIPTION
.PP
You can use the \f[CB]jhsdb\f[R] tool to attach to a Java process or to
launch a postmortem debugger to analyze the content of a core\-dump from
a crashed Java Virtual Machine (JVM).
This command is experimental and unsupported.
.PP
\f[B]Note:\f[R]
.PP
Attaching the \f[CB]jhsdb\f[R] tool to a live process will cause the
process to hang and the process will probably crash when the debugger
detaches.
.PP
The \f[CB]jhsdb\f[R] tool can be launched in any one of the following
modes:
.TP
.B \f[CB]jhsdb\ clhsdb\f[R]
Starts the interactive command\-line debugger.
.RS
.RE
.TP
.B \f[CB]jhsdb\ hsdb\f[R]
Starts the interactive GUI debugger.
.RS
.RE
.TP
.B \f[CB]jhsdb\ debugd\f[R]
Starts the remote debug server.
.RS
.RE
.TP
.B \f[CB]jhsdb\ jstack\f[R]
Prints stack and locks information.
.RS
.RE
.TP
.B \f[CB]jhsdb\ jmap\f[R]
Prints heap information.
.RS
.RE
.TP
.B \f[CB]jhsdb\ jinfo\f[R]
Prints basic JVM information.
.RS
.RE
.TP
.B \f[CB]jhsdb\ jsnap\f[R]
Prints performance counter information.
.RS
.RE
.TP
.B \f[CB]jhsdb\f[R] \f[I]command\f[R] \f[CB]\-\-help\f[R]
Displays the options available for the \f[I]command\f[R].
.RS
.RE
.SH OPTIONS FOR THE DEBUGD MODE
.TP
.B \f[CB]\-\-serverid\f[R] \f[I]server\-id\f[R]
An optional unique ID for this debug server.
This is required if multiple debug servers are run on the same machine.
.RS
.RE
.SH OPTIONS FOR THE JINFO MODE
.TP
.B \f[CB]\-\-flags\f[R]
Prints the VM flags.
.RS
.RE
.TP
.B \f[CB]\-\-sysprops\f[R]
Prints the Java system properties.
.RS
.RE
.TP
.B no option
Prints the VM flags and the Java system properties.
.RS
.RE
.SH OPTIONS FOR THE JMAP MODE
.TP
.B no option
Prints the same information as Solaris \f[CB]pmap\f[R].
.RS
.RE
.TP
.B \f[CB]\-\-heap\f[R]
Prints the \f[CB]java\f[R] heap summary.
.RS
.RE
.TP
.B \f[CB]\-\-binaryheap\f[R]
Dumps the \f[CB]java\f[R] heap in \f[CB]hprof\f[R] binary format.
.RS
.RE
.TP

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