1) Assuming a uniform distribution of request sizes, what percentage of internal
ID: 641196 • Letter: 1
Question
1) Assuming a uniform distribution of request sizes, what percentage of internal fragmentation would we see on avg if the minimum allocation unit is 32 bytes and avg request size is 1 KB?
2) An early version of UNIX was developed for small PDP-11 computers without memory managment hardware. It held only one process in memory at a time, a swap was needed on each context switch. An early disk drive for such system was the RL01. This drive took 55 mS to seek to access the data and that data could be transfered at a rate of 512 KB/S . If each process was 32 KB in size and the quantum was 0.3 S, what fraction of time system was doing useful work?
3) Most of the exmples use the paging system to map a large virtual adress space onto a smaller physical space. Could it be useful to map a small virtual space onto a larger physical space. Why? Why not?
Explanation / Answer
3. Yes, it is useful to map a small virtual space onto a larger physical space because
When there is small virtual space, Less internal fragmentation (unused space within pages) and it Can match better with locality of reference.
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