Which of the following statements are generally true? In case of a false stateme

Question

Which of the following statements are generally true? In case of a false statement, make a correction with a true statement. a. Caches take advantage of temporal locality. b. Caches take advantage of spatial locality. c. Most of the cost of the memory hierarchy is at the highest level. d. Most of the capacity of the memory hierarchy is at the lowest level. e. A L1 cache is a cache for disks f. Main Memory is a cache for page table entries. g. TLB is a cache for a cache. h. A L2 cache is a cache for a main memory. i. If we want the lowest latency for an I/O operation to a single I/O device, the order is polling, DMA, and interrupt driven. j. In terms of lowest impact on processor utilization from a single I/O device, the other is DMA, interrupt driven, and polling. k. Like DRAM, flash is a semiconductor memory. l. Like disks, flash does not lose information if it loses power. m. RAID systems rely on redundancy to achieve high availability. n. RAID 1 (mirroring) has the highest check disk overhead. o. For small writes, RAID 3 (bit-interleaved parity) has the worst throughput. p. For large writes, RAID 3, 4, and 5 have the same throughput.

Explanation / Answer

a. Caches take advantage of temporal locality. Yes. This is TRUE.
b. Caches take advantage of spatial locality. Yes. This is also TRUE.
c. Most of the cost of the memory hierarchy is at the highest level. Yes. This is true.
   The faster the memory, the higher the level, the coslier it is.
d. Most of the capacity of the memory hierarchy is at the lowest level. Yes. This is true.
   The lower the level the more the memory it occupies, and the less it costs.

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