The initial JVM heap size in MB. This property is synonymous to the InitialHeapSizeInMB property.
This property corresponds with the Java -Xms option which is used to specify the initial size of the memory allocation pool. Choosing a value that's too large might make it impossible for the JVM to be loaded. Some JVMs (Sun 1.4.x for example) have a bug that will just terminate the process instead of returning an error code.
IJvmOptions Interface | Codemesh.JuggerNET Namespace