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jmap:tldr:ef5b3
The command "jmap -dump:format=b,file=${filename} ${java_pid}" is used to generate a memory dump file of a running Java process using the jmap tool.
Here is a breakdown of the command:
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"jmap": This is the command-line tool used for generating various memory-related information about running Java processes.
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"-dump:format=b,file=${filename}": This is an option passed to jmap to specify the action to be performed and the format of the memory dump file.
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"dump" is the action specifying that a memory dump should be generated.
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"format=b" specifies the format of the generated memory dump file as binary format.
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"file=${filename}" specifies the name and location of the generated memory dump file. You need to replace ${filename} with the actual desired file name and path.
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"${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.