Operating System BCA 32
9.4 Page Replacement What if there is no free frame? Page replacement –find some page in memory, but not really in use, swap it out In this case, same.
Background Virtual memory – separation of user logical memory from physical memory. Only part of the program needs to be in memory for execution. Logical.
Virtual Memory (Ch. 9). Look at two logically identical java demo programs: workset1 and workset2. Can do same programs using Eclipse. Run each and explain.
Virtual Memory Why? The need of memory more than the available physical memory. Process 1 Process 3 Process 4 Process 2 Physical Memory.
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Operating Systems (printouts)
Operating system
Allocation of Frames Each process needs minimum number of pages Two major allocation schemes –fixed allocation –priority allocation.
Memory Management. We have seen how CPU can be shared by a set of processes – Improve system performance – Process management Need to keep several process.
operating system notes
