1 .\" Copyright (c) 1994, 2019, Oracle and/or its affiliates. All rights reserved. 2 .\" DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 .\" 4 .\" This code is free software; you can redistribute it and/or modify it 5 .\" under the terms of the GNU General Public License version 2 only, as 6 .\" published by the Free Software Foundation. 7 .\" 8 .\" This code is distributed in the hope that it will be useful, but WITHOUT 9 .\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 .\" FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 .\" version 2 for more details (a copy is included in the LICENSE file that 12 .\" accompanied this code). 13 .\" 14 .\" You should have received a copy of the GNU General Public License version 15 .\" 2 along with this work; if not, write to the Free Software Foundation, 16 .\" Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 .\" 18 .\" Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 .\" or visit www.oracle.com if you need additional information or have any 20 .\" questions. 21 .\" 22 .\" Automatically generated by Pandoc 2.3.1 23 .\" 24 .TH "JMAP" "1" "2020" "JDK 14" "JDK Commands" 25 .hy 26 .SH NAME 27 .PP 28 jmap \- print details of a specified process 29 .SH SYNOPSIS 30 .PP 31 \f[B]Note:\f[R] This command is experimental and unsupported. 32 .PP 33 \f[CB]jmap\f[R] [\f[I]options\f[R]] \f[I]pid\f[R] 34 .TP 35 .B \f[I]options\f[R] 36 This represents the \f[CB]jmap\f[R] command\-line options. 37 See \f[B]Options for the jmap Command\f[R]. 38 .RS 39 .RE 40 .TP 41 .B \f[I]pid\f[R] 42 The process ID for which the information specified by the 43 \f[I]options\f[R] is to be printed. 44 The process must be a Java process. 45 To get a list of Java processes running on a machine, use either the 46 \f[CB]ps\f[R] command or, if the JVM processes are not running in a 47 separate docker instance, the \f[B]jps\f[R] command. 48 .RS 49 .PP 50 \f[B]Note:\f[R] JDK 10 has added support for using the Attach API when 51 attaching to Java processes running in a separate docker process. 52 However, the \f[CB]jps\f[R] command will not list the JVM processes that 53 are running in a separate docker instance. 54 If you are trying to connect a Linux host with a Virtual Machine that is 55 in a docker container, you must use tools such as \f[CB]ps\f[R] to look up 56 the PID of the JVM. 57 .RE 58 .SH DESCRIPTION 59 .PP 60 The \f[CB]jmap\f[R] command prints details of a specified running process. 61 .PP 62 \f[B]Note:\f[R] 63 .PP 64 This command is unsupported and might not be available in future 65 releases of the JDK. 66 On Windows Systems where the \f[CB]dbgeng.dll\f[R] file isn\[aq]t present, 67 the Debugging Tools for Windows must be installed to make these tools 68 work. 69 The \f[CB]PATH\f[R] environment variable should contain the location of 70 the \f[CB]jvm.dll\f[R] file that\[aq]s used by the target process or the 71 location from which the core dump file was produced. 72 .SH OPTIONS FOR THE JMAP COMMAND 73 .TP 74 .B \f[CB]\-clstats\f[R] \f[I]pid\f[R] 75 Connects to a running process and prints class loader statistics of Java 76 heap. 77 .RS 78 .RE 79 .TP 80 .B \f[CB]\-finalizerinfo\f[R] \f[I]pid\f[R] 81 Connects to a running process and prints information on objects awaiting 82 finalization. 83 .RS 84 .RE 85 .TP 86 .B \f[CB]\-histo\f[R][\f[CB]:live\f[R]] \f[I]pid\f[R] 87 Connects to a running process and prints a histogram of the Java object 88 heap. 89 If the \f[CB]live\f[R] suboption is specified, it then counts only live 90 objects. 91 .RS 92 .RE 93 .TP 94 .B \f[CB]\-dump:\f[R]\f[I]dump_options\f[R] \f[I]pid\f[R] 95 Connects to a running process and dumps the Java heap. 96 The \f[I]dump_options\f[R] include: 97 .RS 98 .IP \[bu] 2 99 \f[CB]live\f[R] \-\-\- When specified, dumps only the live objects; if not 100 specified, then dumps all objects in the heap. 101 .IP \[bu] 2 102 \f[CB]format=b\f[R] \-\-\- Dumps the Java heap in \f[CB]hprof\f[R] binary 103 format 104 .IP \[bu] 2 105 \f[CB]file=\f[R]\f[I]filename\f[R] \-\-\- Dumps the heap to 106 \f[I]filename\f[R] 107 .PP 108 Example: \f[CB]jmap\ \-dump:live,format=b,file=heap.bin\f[R] \f[I]pid\f[R] 109 .RE