GATE Computer Science (CS) 2017 Shift 2 Solved Paper
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The read access times and the hit ratios for different caches in a memory hierarchy are as given below:
The read access time of main memory is 90 nanoseconds. Assume that the caches use the referred-word-first read policy and the write back policy. Assume that all the caches are direct mapped caches. Assume that the dirty bit is always 0 for all the blocks in the caches. In execution of a program, 60% of memory reads are for instruction fetch and 40% are for memory operand fetch. The average read access time in nanoseconds (up to 2 decimal places) is ______.
|
Cache |
Read access time (in nanoseconds) |
Hit ratio |
|
I-cache |
2 |
0.8 |
|
D-cache |
2 |
0.9 |
|
L2-cache |
8 |
0.9 |
The read access time of main memory is 90 nanoseconds. Assume that the caches use the referred-word-first read policy and the write back policy. Assume that all the caches are direct mapped caches. Assume that the dirty bit is always 0 for all the blocks in the caches. In execution of a program, 60% of memory reads are for instruction fetch and 40% are for memory operand fetch. The average read access time in nanoseconds (up to 2 decimal places) is ______.
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