Usage: jstat -help|-options
jstat -<option> [-t][-h<lines>] <vmid> [<interval> [<count>]]Definitions:
<option> An option reported by the -options option
<vmid> Virtual Machine Identifier. A vmid takes the following form:
<lvmid>[@<hostname>[:<port>]] Where <lvmid> is the local vm identifier for the target
Java virtual machine, typically a process id; <hostname> is
the name of the host running the target Java virtual machine; and <port> is the port number for the rmiregistry on the
target host. See the jvmstat documentation for a more complete description of the Virtual Machine Identifier.
<lines> Number of samples between header lines.
<interval> Sampling interval. The following forms are allowed:
<n>["ms"|"s"] Where <n> is an integer and the suffix specifies the units as
milliseconds("ms") or seconds("s"). The default units are "ms".
<count> Number of samples to take before terminating.
-J<flag> Pass <flag> directly to the runtime system.
Usage:
jinfo [option] <pid>
(to connect to running process) jinfo [option] <executable <core>
(to connect to a core file) jinfo [option][server_id@]<remote server IP or hostname>
(to connect to remote debug server)where <option> is one of:
-flag <name> to print the value of the named VM flag
-flag [+|-]<name> to enable or disable the named VM flag
-flag <name>=<value> to set the named VM flag to the given value
-flags to print VM flags
-sysprops to print Java system properties
<no option> to print both of the above
-h | -help to print this help message
Usage:
jmap [option] <pid>
(to connect to running process) jmap [option] <executable <core>
(to connect to a core file) jmap [option][server_id@]<remote server IP or hostname>
(to connect to remote debug server)where <option> is one of:
<none> to print same info as Solaris pmap
-heap to print java heap summary
-histo[:live] to print histogram of java object heap;if the "live" suboption is specified, only count live objects
-clstats to print class loader statistics
-finalizerinfo to print information on objects awaiting finalization
-dump:<dump-options> to dump java heap in hprof binary format
dump-options:
live dump only live objects;if not specified,
all objects in the heap are dumped.
format=b binary format
file=<file> dump heap to <file>
Example: jmap -dump:live,format=b,file=heap.bin <pid>
-F force. Use with -dump:<dump-options> <pid> or -histo
to force a heap dump or histogram when <pid> does not
respond. The "live" suboption is not supported
in this mode.
-h | -help to print this help message
-J<flag> to pass <flag> directly to the runtime system
常用命令
jstack
官方手册
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Usage:
jstack [-l] <pid>
(to connect to running process) jstack -F [-m][-l] <pid>
(to connect to a hung process) jstack [-m][-l] <executable> <core>
(to connect to a core file) jstack [-m][-l][server_id@]<remote server IP or hostname>
(to connect to a remote debug server)Options:
-F to force a thread dump. Use when jstack <pid> does not respond (process is hung) -m to print both java and native frames (mixed mode) -l long listing. Prints additional information about locks
-h or -help to print this help message
