What is XMs - XMx - How to control Java heap size (memory) allocation

Java memory FAQ: How do I control the amount of memory my Java program uses (i.e., Java RAM usage)?

The short answer
The short answer is that you use these Java command-line parameters to help control the RAM use of application:
Use -Xmx to specify the maximum heap size
Use -Xms to specify the initial Java heap size
Use -Xss to set the Java thread stack size

Use this syntax to specify the amount of memory :

-Xms64m or -Xms64M
-Xmx1g or -Xmx1G

java -Xms512m -Xmx1024m
So java process will start with 512 MB of memory heap and can use upto 1024 MB of memory heap.
-Xmx and -Xms can be defined in different size such as kilobytes, megabytes and gigabytes.
-Xmx2048k-Xmx1024m-Xmx2g

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[bhaskar]

Very useful
I see no one provided this kind information on jenkins

[arkaimps]

This is simply awesome... Have seen this exception before, but never really put my head onto the solution of it.
Always thought of more optimization of code, which though should be the first approach..

But this video is extremely resourceful and knowledgeful..

[sagaragrawal]

how about specifying memory as Gi and not G ? Would Gi work ? For example memoryLimit: 3Gi please let me know.

[jamesward]

A question,
If I allocate Xms equal to Xmx, will the garbage collector ever activate?

[shwetapandey]

Hi, how can we solve this issue on jenkins