Per-process memory limits
A system may limit the amount of memory each process may use. This is usually a matter of policy but it can also happen when the OS has a larger address space than is available at the process level. It is not uncommon[citation needed] for high-end 32-bit systems to come with 8GB or more of system memory, even though any single process can only access 4GB of it in a 32-bit flat memory model.
