Physical Address Extension
Physical Address Extension Memory as a storage instruction / data from the rapid Storage program in order to compensate the speed of CPU instruction execution n consists of "an array of words or bytes big address used to access data (shared by the CPU and I / O devices) Main memory is "volatile" - not permanent. Its contents will be lost if the system failure. Management memori: Tracking memory consumption (and by whom?). Choosing which programs to be loaded into memory. Allocation and De-allocation of physical memory for the program.
Now this feature on x86 processors, and x86-64 which allows the use of memory (RAM) is more than 4 GB on 32 bit based systems. PAE works by adding the address to select the additional memory, so the physical address size increased from 32 bits to 36 bits. For applications that require access to more than 4 GB of memory requires a mechanism within Windows called Address Windowing Extensions (AWE). While on a Unix system used tricks named mmap to map areas of the file and provide the required address.
To execute the program must be in memory • The allocation of memory resources: space (the storage) to store data, instructions, etc. stack. • Problem: physical memory (the storage) is very limited in size, • storage management: allocation and deallocation for the processes in the use of address space. • Utilization: optimal and efficient.
Now this feature on x86 processors, and x86-64 which allows the use of memory (RAM) is more than 4 GB on 32 bit based systems. PAE works by adding the address to select the additional memory, so the physical address size increased from 32 bits to 36 bits. For applications that require access to more than 4 GB of memory requires a mechanism within Windows called Address Windowing Extensions (AWE). While on a Unix system used tricks named mmap to map areas of the file and provide the required address.
To execute the program must be in memory • The allocation of memory resources: space (the storage) to store data, instructions, etc. stack. • Problem: physical memory (the storage) is very limited in size, • storage management: allocation and deallocation for the processes in the use of address space. • Utilization: optimal and efficient.
Komentar