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I'm trying to use the jmap command on my CentOS server but it keeps telling me that the command was not found even though I have the JDK installed.
Here is the output of command java -version:
java version "1.7.0_25" OpenJDK Runtime Environment (rhel-2.3.10.4.el6_4-x86_64) OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode) How can I fix this issue?
809
jmap. jmap prints heap dumps into a specified file location. This tool is packaged within JDK. It can be found in \bin folder.
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.
jmap tool is shipped with JDK. Here is how you should invoke it: jmap -dump:live,file=<file-path> <pid> where pid: is the Java Process Id, whose heap dump should be captured file-path: is the file path where heap dump will be written in to. Note: It's quite important that you pass the “live” option in the command line.
jmap is a tool to print statistics about memory in a running JVM. We can use it for local or remote processes. Along with that option, we should specify several parameters: live: if set, it only prints objects which have active references and discards the ones that are ready to be garbage collected.
You should be able to find jmap in the java-1.8.0-openjdk-devel-debug, or java-1.7.0-openjdk-devel-debug, or java-1.6.0-openjdk-devel-debug packages on Redhat/Centos. To install it, run the following as root:
yum install java-1.8.0-openjdk-devel-debug For completeness, here's the command to check which packages include jmap:
yum whatprovides '*/jmap' Here's a sample output:
1:java-1.6.0-openjdk-devel-1.6.0.37-1.13.9.4.el7_1.x86_64 : OpenJDK Development Environment Repo : updates Matched from: Filename : /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.37.x86_64/bin/jmap 1:java-1.7.0-openjdk-devel-1.7.0.91-2.6.2.3.el7.x86_64 : OpenJDK Development Environment Repo : base Matched from: Filename : /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64/bin/jmap 1:java-1.8.0-openjdk-devel-1.8.0.65-3.b17.el7.x86_64 : OpenJDK Development Environment Repo : base Matched from: Filename : /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64/bin/jmap 1:java-1.8.0-openjdk-devel-debug-1.8.0.65-3.b17.el7.x86_64 : OpenJDK Development Environment with full debug on Repo : base Matched from: Filename : /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64-debug/bin/jmap 1:java-1.8.0-openjdk-devel-debug-1.8.0.65-3.b17.el7.x86_64 : OpenJDK Development Environment with full debug on Repo : @base Matched from: Filename : /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64-debug/bin/jmap If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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