XMS stands for eXtended Memory Specification.
It is a parameter in JVM which is used to set the minimum or initial Heap Size.
XMX is a parameter in JVM which is used to set the maximum Heap Size.
You can specify it in your IDE.
Like -
-Xmx500m (will set maximum Heap size = 500m)
-Xms500m (will set minimum Heap Size = 500m)
For minimum garbage collection,
minimum heap size (XMS) = maximum heap size (XMX)
