How Does Java Determine its Default Maximum Heap Size?

Determining the Default Maximum Java Heap Size

When launching a Java application without specifying the -Xmx option, a default value for the maximum heap size is assigned. As per Java documentation, "the default value is chosen at runtime based on system configuration." Comprehending the system configuration elements that govern this default value is essential.

System Configuration Parameters influencing the Default Heap Size

1. Windows:

Execute the following command on Windows to reveal the default settings for your system:

java -XX:+PrintFlagsFinal -version | findstr HeapSize

The options MaxHeapSize (-Xmx) and InitialHeapSize (-Xms) should be located.

2. Unix/Linux:

Use the command below to obtain the default settings on Unix/Linux systems:

java -XX:+PrintFlagsFinal -version | grep HeapSize

The output displays the values in bytes.

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