What are the default xmx and xms values ?

-xmx and -xms are the parameters used to adjust the heap size.

-Xms:It is used for setting the initial and minimum heap size. It is recommended to set the minimum heap size equivalent to the maximum heap size in order to minimize the garbage collection.

-Xmx: It is used for setting the maximum heap size. The performance will decrease if the max heap value is set lower than the amount of live data. It will force frequent garbage collections in order to free up space.

So, you can say that the JVM will start working with with -Xms amount of memory and further it will be able to use a maximum of -Xmx amount of memory. For example,

java -Xms256m -Xmx2048m

This means, JVM will startup with 256 MB of memory and will allow the process to use up to 2048 MB of memory.

By default, there is no value set for xms, and for xmx its 256MB. You can specify it in multiple formats like kilobytes, megabytes, etc.

-Xmx1024k     -Xmx512m     -Xmx8g

TO Run this code and see all the options:
java -X

You may refer to this blog for a comprehensive understanding of XMS and XMX within the Java Virtual Machine (JVM).

The Xmx flag designates the maximum memory allocation pool for the JVM, whereas the Xms flag indicates the initial memory allocation pool.

It is important to note that the Xms flag does not have a default value, while the Xmx flag generally defaults to 256 MB. These flags are particularly useful when addressing a java.lang.OutOfMemoryError.

These command-line parameters in Java are utilized to manage the application's RAM usage:

- -Xmx: to define the maximum heap size
- -Xms: to define the initial Java heap size

In essence, the JVM will initiate with the memory specified by Xms and can utilize up to the memory limit set by Xmx. The -Xms option is employed to establish the initial and minimum heap size in Java, while the -Xmx option is used to define the final and maximum heap size in Java.

The -Xmx and -Xms options are utilized together to set limits on the heap size in Java. The Java heap size cannot exceed the value specified by -Xmx. Additionally, the -Xms parameter can be designated as the "minimum heap size," allowing for a fixed heap size by equating -Xms to -Xmx.

The default values are determined at runtime, depending on the system's configuration. For further details, please refer to HotSpot Ergonomics.

Hello, @All, On Windows, you can execute the following command to determine the default settings on the system where your applications operate: java -XX:+PrintFlagsFinal -version | findstr HeapSize You should look for the parameters MaxHeapSize (corresponding to -Xmx) and InitialHeapSize (corresponding to -Xms). For Unix/Linux systems, the command is: java -XX:+PrintFlagsFinal -version | grep HeapSize It is my understanding that the output will be displayed in bytes.

The -Xms value should represent your NORMAL workload, while -Xmx should indicate your upper limits.