UNIX Programming and Technical

Q. What is major difference between the Historic Unix and the new BSD release of Unix System V in terms of Memory Management?

A. Historic Unix uses Swapping entire process is transferred to the main memory from the swap device, whereas the Unix System V uses Demand Paging only the part of the process is moved to the main memory. Historic Unix uses one Swap Device and Unix System V allow multiple Swap Devices

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UNIX Other Question

Q. What is the difference between Swapping and Paging?

A.
Swapping-:
Whole process is moved from the swap device to the main memory for execution. Process size must be less than or equal to the available main memory. It is easier to implementation and overhead to the system. Swapping systems does not handle the memory more flexibly as compared to the paging systems.
Paging-:
Only the required memory pages are moved to main memory from the swap device for execution. Process size does not matter. Gives the concept of the virtual memory.
It provides greater flexibility in mapping the virtual address space into the physical memory of the machine. Allows more number of processes to fit in the main memory simultaneously. Allows the greater process size than the available physical memory. Demand paging systems handle the memory more flexibly. Q. What is the main goal of the Memory Management?

A. It decides which process should reside in the main memory,
Manages the parts of the virtual address space of a process which is non-core resident,
Monitors the available main memory and periodically write the processes into the swap device to provide more processes fit in the main memory simultaneously.