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題組內容

10. (5 points) Continuing from the last question, which of the following statements is/are correct?

(c) The /etc/inittab file defines what each configured runlevel does in a given system.

相關申論題

(a) A cooling door for a rack costs $4000 and dissipates 16 KW (into the room; additional cost is required to get it out of the room). The cooling door can cool 223 servers with a P2 processor, an M2 DRAM, and a single D2 hard drive.

(b) You are considering providing fault tolerance with a P2 processor, an M2 DRAM, and seven D1 hard drives running RAID 2. Now 134 systems can be cooled down on a single rack with a single cooler.

(a) A cooling door for a rack costs $6000 and dissipates 16 KW (into the room; additional cost is required to get it out of the room). The servers are all with a P1 processor, an MI DRAM, and two D1 hard drives with RAID 1. In the farm, a single rack can host up to 28 servers.

(b) From part (a), two cooling doors are required for a single rack.

(c) Suppose a cooling door for a rack costs $3500 and dissipates 28KW (into the room; additional cost is required to get it out of the room).The servers are all with a P2 processor, an M1 DRAM, and five D2 hard drives with RAID 6. In the farm, a single rack can host up to 30 servers.

(a) Larger block sizes reduce compulsory misses, increase the miss penalty, and can increase capacity or conflict misses.

(b) Larger cache capacities reduces miss rate but may incur longer hit time and higher cost and power.

(c) Greater associativity reduces conflict misses. Greater associativity can come at the cost of incrcased hit time.

(a) In a multilevel cache system, the first-level cache can be small enough to match a fast clock cycle time, yet the second-level (or third-level) cache can be large enough to capture many accesses that would go to main memory.

(b) Most proces ssors give cache write misses priority over read misses to reduce miss penalty.

相關試卷

110年 - 110 國立臺灣大學_碩士班招生考試_電機工程研究所丙組:計算機結構與作業系統(A)#102089

110年 · #102089

109年 - 109國立臺灣大學_碩士班招生考試_電機工程研究所丙組:計算機結構與作業系統(A)#105855

109年 · #105855

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