Questão de Informática

The UNIX memory model is simple. Each process has three segments: code, data, and stack. In a machine with a single, linear address space, the code is generally placed near the bottom of memory, followed by the data. The stack is placed at the top of memory. The code size is fixed, but the data and stack may each grow, in opposite directions. This model is easy to implement on almost any machine and is the model used by Solaris. Furthermore, if the machine has paging, the entire address space can be paged, without user programs even being aware of it. The only thing they notice is that it is permitted to have programs larger than the machine´s physical memory. UNIX systems that do not have paging generally swap entire processes between memory and disk to allow an arbitrarily large number of processes to be timeshared. [Extraído de: Structured Computer Organization, Andrew S. Tanenbaum, Fourth Edition, pg. 455.]