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I want to use the gc utility to analyse the garbage collection for my Cassandra database. But when I am running jstat command the output comes that bash:jstat: command not found. I searched and found that jstat is located in $JAVA_HOME/bin but I am not able to understand where is $JAVA_HOME/bin. I want to know how to start using jstat?

Kumar Saras
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2 Answers2

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jstat is a tool which is available in jdk (development environment). If your application is using jre then only the tools under jre/bin will be available in your execution environment. Make sure to use jdk as your execution environment to use jstat tool.

Samiron
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Shriram
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  • Also, make sure that the same user is trying to execute it. For example if the tomcat user has ran your java, try running; sudo -H -u tomcat ./jstat -gc – Youness Oct 23 '18 at 00:47
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To see $JAVA_HOME path, you have to run the following command:

echo $JAVA_HOME

It will print java home directory path.

To run jstat, you have to go to $JAVA_HOME/bin path and run the following command:

./jstat -gc 29563

Note: gc is option (there are more options) and 29563 is java process ID. see oracle document for details.

arifng
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