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jmap - Unix, Linux Command
NAME
jmap - memory map
SYNOPSIS
jmap [option] pid
jmap [option] executable core
jmap [option] [server-id@]remote-hostname-or-IP DESCRIPTION
jmap prints shared object memory maps or heap memory
details of a given process or core file
or remote debug server.
NOTE - This utility is unsupported and may or may not be
available in future versions of the J2SE SDK.
jmap is not currently available on Windows platforms or
on the Linux Itanium platform.
PARAMETERS
Tag | Description |
option |
Options are mutually exclusive. Option, if
used, shouldfollow immediately after the command name.
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pid |
process id for which the memory map is to be printed.
The process must be a Java process. To get a
list of Java processes
running on a machine, jps may be used.
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executable |
Java executable from which the core dump was produced.
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core |
core file for which the memory map is to be printed.
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remote-hostname-or-IP |
remote debug servers (see jsadebugd) hostname or IP address.
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server-id |
optional unique id, if multiple debug servers are
running on the same remote host.
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OPTIONS
Tag | Description |
<no option> |
When no option is used
jmap prints shared object mappings. For each shared object
loaded in the target VM, start address,
the size of the mapping, and the full path of the
shared object file are printed. This is similar
to the Solaris
pmap utility.
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-heap |
Prints a heap summary. GC algorithm used, heap
configuration and generation wise heap usage are printed.
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-histo |
Prints a histogram of the heap. For each Java class,
number of objects, memory size in bytes, and
fully qualified class names
are printed. VM internal class names are
printed with * prefix.
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-permstat |
Prints class loader wise statistics of permanent
generation of Java heap. For each class loader,
its name, liveness, address,
parent class loader, and the number and size of
classes it has loaded are printed.
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-h |
Prints a help message.
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-help |
Prints a help message.
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SEE ALSO
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