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jmap:tldr:8f459
The command "jmap -heap ${filename-jar} ${java_pid}" is used to get the heap memory usage statistics of a Java process.
Here's an explanation of the components in the command:
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"jmap" is a Java Memory Map tool that is bundled with the Java Development Kit (JDK). It is used to generate memory-related information about Java processes, including heap memory usage statistics.
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"-heap" is an option provided by the "jmap" tool that specifies the type of memory information to retrieve. In this case, it retrieves the heap memory usage.
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"${filename-jar}" is a placeholder for the filename or path of the Java JAR file. JAR (Java ARchive) is a package file format used to distribute Java applications.
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"${java_pid}" is a placeholder for the process ID (PID) of the Java process for which you want to get the heap memory usage statistics. The PID uniquely identifies a running process on the operating system.
By running this command with the appropriate values for "${filename-jar}" and "${java_pid}", you can obtain the heap memory usage statistics for the specified Java process.