How Do I Determine the Default Java Heap Size on My System?

Determining Default Java Heap Size Parameters

The Java Virtual Machine (JVM) assigns a default maximum heap size when the -Xmx option is not specified in the command line. According to Java documentation, this value is determined dynamically based on the system configuration.

How to Find System Configuration Settings Affecting Default Heap Size

Windows:

To determine the default heap size settings on Windows systems, execute the following command:

java -XX:+PrintFlagsFinal -version | findstr HeapSize

Look for the options "MaxHeapSize" (for -Xmx) and "InitialHeapSize" (for -Xms).

Unix/Linux:

On Unix/Linux systems, use the following command:

java -XX:+PrintFlagsFinal -version | grep HeapSize

The output should display heap size parameters, which are generally in bytes.

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