A computer system has a memory access time of 120 ns. The hit rate is 96% and memory and cache accesses don' t lap and affect each other. In order AMAT to be under 12 ns, what should the maximum cache access time be?
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A: Your answer is given below in detail.
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A: Introduction
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- A memory hierarchy contains a single cache with a miss rate of 2% that holds both instructions and data. The miss penalty to access main memory is 100 cycles. 15% of the instructions are jumps, 20% are stores, 20% are loads (30% have values used in the next instruction), 10% are branches (taken 20% of the time), and 35% are ALU instructions. Jumps and branches are determined in the ID stage. What is the base CPI, and what is the effective CPI?A cache memory needs an access time of 30 ns and main memory 150 ns, what is the average access time of CPU (assume hit ratio= = 80%)?In a two-level cache system, the access time of cache L₁ is 2 cycle and the access time of cache L2 is 7 cycle. The miss rate of L₁ is thrice the miss rate of L2. the miss penalty from the L2 cache to main memory is 20 clock cycles. The average memory access time of the system is 4 cycle. The hit rate of L2 is (correct up to 2 decimal places).
- Suppose the cache access time is 10ns, main memory access time is 200ns, and the cache hit rate is 95%. Assuming parallel (overlapped) access (or say, load-through is used), what is the average access time for the processor to access an item?AsapA certain processor uses separate instruction and data caches with hit ratios 97% and 94% respectively. The access time from the processor to either cache is 1 clock cycle, and the block transfer time between the caches and main memory is 67 clock cycles. Among blocks replaced in the data cache, 21% is the percentage of dirty blocks (Dirty means that the cache copy is different from the memory copy). Assuming a write-back policy, what is the AMAT for the instructions in this system? Round to 2 decimal places.
- Suppose the cache access time is 1 ns, main memory access time is 100 ns and the cache hit rate is 98%. Assuming memory access is initiated with cash access, what is the effective memory access time (round up to 2 digits after the decimal point)A cache memory system with capacity of N words and block size of B words is to be designed. If it is designed as a direct mapped cache, the length of the TAG field is 14 bits. If it is designed as a 4-way set associative cache, the length of the TAG field will be ………… bits.Asap
- Computer Science In a memory system, it takes 17 ns to search the TLB and 120 ns to access memory. 78% of the time the needed PTE will be in the TLB. What is the effective memory access time in nanoseconds (rounded to the nearest integer) assuming a two-level page table?Suppose cache has a hit rate of 0.89 and access time of 5ns, main memory has a hit rate of 0.98 and access time of 60ns, and virtual memory has an access time of 700 us (microseconds). What is the average memory access time in us?The hit rate of the memory closest to the ALU is increased from 75% to 80% in a practical cache memory hierarchy. The hit latency (or hit time) for the closest memory is 20ps, while the miss latency is 20ns. What would the expected reduction in the average memory access latency be?