Virtual Address Space of a Work Process

With 32-bit systems, 4 GB of memory can theoretically be addressed; depending on the operating system, there are approximately 2 GB of virtual address space available to a process.
This consists of a text and a data segment, a dynamically extendible heap and a dynamically extendible stack. The heap increases in size from the bottom and the stack increases from the top; this enables the entire virtual address space to be used.

With an SAP work process, there are special areas reserved on the heap whose size can be set using a profile parameter. These are:

Roll area
SAP paging area
Private memory

The largest reserved area is located between the heap and stack: of the SAP Extended Memory.