Operating Systems RECALL THE REAL STORAGE PLACEMENT STRATEGIES: FIRST-FIT, BEST-

Question

Operating Systems

RECALL THE REAL STORAGE PLACEMENT STRATEGIES: FIRST-FIT, BEST-FIT, AND WORST-FIT. CHOOSE THE MOST CORRECT ANSWER IF WE WANT TO PLACE THE FIRST TWO PROCESSES ON THE READY LIST (FIRST A AND THEN B) INTO MAIN MEMORY. ASSUME NO OTHER PROCESS LEAVES MAIN MEMORY. (NOTE: HOLE NUMBERS DO NOT DISAPPEAR IF A PARTIAL HOLE REMAINS)

Select one:

a. FIRST-FIT WILL PLACE A IN HOLE #1 AND B IN HOLE #2.

b. BEST-FIT WILL PLACE A IN HOLE #2 AND B IN HOLE #2.

c. WORST-FIT WILL PLACE A IN HOLE #4 AND B IN HOLE #1.

d. REAL STORAGE STRATEGIES ARE CONCERNED WITH REPLACEMENT, NOT PLACEMENT STRATEGIES.

e. NONE OF THESE ANSWERS

READY LIST A 10K I B 4K) MEMORY (BEFORE A AND B ARE PLACED) OPERATING SYSTEM 6K HOLE IN US 15K HOLE IN US 4K HOLE I//////////// IN-USE I 30K HOLE HOLE

Explanation / Answer

Option A is correct. Using First fit method the freely available block is chosen to place files.

Option B is wrong because both files are notplaced in same block.

Option c is wrong , in worst fit both objects are placed in same hole.

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