1 '\" t 2 .\" Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved. 3 .\" DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 .\" 5 .\" This code is free software; you can redistribute it and/or modify it 6 .\" under the terms of the GNU General Public License version 2 only, as 7 .\" published by the Free Software Foundation. 8 .\" 9 .\" This code is distributed in the hope that it will be useful, but WITHOUT 10 .\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 .\" FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 .\" version 2 for more details (a copy is included in the LICENSE file that 13 .\" accompanied this code). 14 .\" 15 .\" You should have received a copy of the GNU General Public License version 16 .\" 2 along with this work; if not, write to the Free Software Foundation, 17 .\" Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 .\" 19 .\" Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 .\" or visit www.oracle.com if you need additional information or have any 21 .\" questions. 22 .\" 23 .\" Arch: generic 24 .\" Software: JDK 8 25 .\" Date: 21 November 2013 26 .\" SectDesc: Troubleshooting Tools 27 .\" Title: jmap.1 28 .\" 29 .if n .pl 99999 30 .TH jmap 1 "21 November 2013" "JDK 8" "Troubleshooting Tools" 31 .\" ----------------------------------------------------------------- 32 .\" * Define some portability stuff 33 .\" ----------------------------------------------------------------- 34 .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 35 .\" http://bugs.debian.org/507673 36 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html 37 .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 38 .ie \n(.g .ds Aq \(aq 39 .el .ds Aq ' 40 .\" ----------------------------------------------------------------- 41 .\" * set default formatting 42 .\" ----------------------------------------------------------------- 43 .\" disable hyphenation 44 .nh 45 .\" disable justification (adjust text to left margin only) 46 .ad l 47 .\" ----------------------------------------------------------------- 48 .\" * MAIN CONTENT STARTS HERE * 49 .\" ----------------------------------------------------------------- 50 51 .SH NAME 52 jmap \- Prints shared object memory maps or heap memory details for a process, core file, or remote debug server\&. This command is experimental and unsupported\&. 53 .SH SYNOPSIS 54 .sp 55 .nf 56 57 \fBjmap\fR [ \fIoptions\fR ] \fIpid\fR 58 .fi 59 .nf 60 61 \fBjmap\fR [ \fIoptions\fR ] \fIexecutable\fR \fIcore\fR 62 .fi 63 .nf 64 65 \fBjmap\fR [ \fIoptions\fR ] [ \fIpid\fR ] \fIserver\-id\fR@ ] \fIremote\-hostname\-or\-IP\fR 66 .fi 67 .sp 68 .TP 69 \fIoptions\fR 70 The command-line options\&. See Options\&. 71 .TP 72 \fIpid\fR 73 The 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, use the jps(1) command\&. 74 .TP 75 \fIexecutable\fR 76 The Java executable from which the core dump was produced\&. 77 .TP 78 \fIcore\fR 79 The core file for which the memory map is to be printed\&. 80 .TP 81 \fIremote-hostname-or-IP\fR 82 The remote debug server \f3hostname\fR or \f3IP\fR address\&. See jsadebugd(1)\&. 83 .TP 84 \fIserver-id\fR 85 An optional unique ID to use when multiple debug servers are running on the same remote host\&. 86 .SH DESCRIPTION 87 The \f3jmap\fR command prints shared object memory maps or heap memory details of a specified process, core file, or remote debug server\&. If the specified process is running on a 64-bit Java Virtual Machine (JVM), then you might need to specify the \f3-J-d64\fR option, for example: \f3jmap\fR\f3-J-d64 -heap pid\fR\&. 88 .PP 89 \fINote:\fR This utility is unsupported and might not be available in future releases of the JDK\&. On Windows Systems where the \f3dbgeng\&.dll\fR file is not present, Debugging Tools For Windows must be installed to make these tools work\&. The \f3PATH\fR environment variable should contain the location of the \f3jvm\&.dll\fR file that is used by the target process or the location from which the crash dump file was produced, for example: \f3set PATH=%JDK_HOME%\ejre\ebin\eclient;%PATH%\fR\&. 90 .SH OPTIONS 91 .TP 92 <no option> 93 When no option is used, the \f3jmap\fR command prints shared object mappings\&. For each shared object loaded in the target JVM, the start address, size of the mapping, and the full path of the shared object file are printed\&. This behavior is similar to the Oracle Solaris \f3pmap\fR utility\&. 94 .TP 95 -dump:[live,] format=b, file=\fIfilename\fR 96 .br 97 Dumps the Java heap in \f3hprof\fR binary format to \f3filename\fR\&. The \f3live\fR suboption is optional, but when specified, only the active objects in the heap are dumped\&. To browse the heap dump, you can use the jhat(1) command to read the generated file\&. 98 .TP 99 -finalizerinfo 100 .br 101 Prints information about objects that are awaiting finalization\&. 102 .TP 103 -heap 104 .br 105 Prints a heap summary of the garbage collection used, the head configuration, and generation-wise heap usage\&. In addition, the number and size of interned Strings are printed\&. 106 .TP 107 -histo[:live] 108 .br 109 Prints a histogram of the heap\&. For each Java class, the number of objects, memory size in bytes, and the fully qualified class names are printed\&. The JVM internal class names are printed with an asterisk (*) prefix\&. If the \f3live\fR suboption is specified, then only active objects are counted\&. 110 .TP 111 -clstats 112 .br 113 Prints class loader wise statistics of Java heap\&. For each class loader, its name, how active it is, address, parent class loader, and the number and size of classes it has loaded are printed\&. 114 .TP 115 -F 116 .br 117 Force\&. Use this option with the \f3jmap -dump\fR or \f3jmap -histo\fR option when the pid does not respond\&. The \f3live\fR suboption is not supported in this mode\&. 118 .TP 119 -h 120 .br 121 Prints a help message\&. 122 .TP 123 -help 124 .br 125 Prints a help message\&. 126 .TP 127 -J\fIflag\fR 128 .br 129 Passes \f3flag\fR to the Java Virtual Machine where the \f3jmap\fR command is running\&. 130 .SH SEE\ ALSO 131 .TP 0.2i 132 \(bu 133 jhat(1) 134 .TP 0.2i 135 \(bu 136 jps(1) 137 .TP 0.2i 138 \(bu 139 jsadebugd(1) 140 .RE 141 .br 142 'pl 8.5i 143 'bp