How Does the Java Option -Xmx Control Memory Allocation?

Java Option -Xmx: Defining Maximum Memory Allocation

The Java option -Xmx is employed to specify the maximum size of the memory allocation pool, providing control over the amount of memory Java can utilize.

What the Option Does

By using -Xmx, you can set a limit for the Java heap memory, ensuring that it doesn't exceed a certain threshold. The value provided to this option should be a multiple of 1024 greater than 2MB.

Syntax

The syntax for -Xmx is as follows:

-Xmx<n>

where:

• n represents the maximum size of the memory allocation pool in bytes. You can append "k" or "K" to indicate kilobytes, or "m" or "M" to indicate megabytes.

Example

For instance, in the command:

java -Xmx1024m filename

you're setting the maximum heap memory size to 1024 MB (approx. 1GB).

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