jmap:tldr:ef5b3

jmap: Dump contents of the heap into a binary file for analysis with jhat.

jmap

$ jmap -dump:format=b,file=${filename} ${java_pid}

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The command "jmap -dump:format=b,file=${filename} ${java_pid}" is used to generate a memory dump file of a running Java process using the jmap tool.

Here is a breakdown of the command:

"jmap": This is the command-line tool used for generating various memory-related information about running Java processes.
"-dump:format=b,file=${filename}": This is an option passed to jmap to specify the action to be performed and the format of the memory dump file.
- "dump" is the action specifying that a memory dump should be generated.
- "format=b" specifies the format of the generated memory dump file as binary format.
- "file=${filename}" specifies the name and location of the generated memory dump file. You need to replace ${filename} with the actual desired file name and path.
"${java_pid}": This is the Java process ID (PID) of the running Java process for which you want to generate the memory dump. You need to replace ${java_pid} with the actual PID of the Java process you want to target.

In summary, the command is used to generate a binary-format memory dump file for a specific Java process using the jmap tool, which can later be analyzed for troubleshooting memory-related issues or performance optimization.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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