Consider a memory system with a cache access time of 100ns and a memory access time of 1200ns. If the effective access time is 10% greater than the cache access time, what is the hit ratio H?
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- If a microprocessor has a cycle time of 0.5 nanoseconds, what’s the processor clock rate? If the fetch cycle is 40% of the processor cycle time, what memory access speed is required to implement load operations with zero wait states and load operations with two wait states?Consider a memory system with a cache access time of 100ns and a memory access timeof 1200ns. If the effective access time is 10% greater than the cache access time, what is thehit ratio H?Consider a system with 2 level cache. Access times of Level 1 cache, Level 2 cache and main memory are 1 ns, 10 ns, and 500 ns, respectively. The hit rates of Level 1 and Level 2 caches are 0.8 and 0.9, respectively. What is the average access time of the system ignoring the search time within the cache?
- Consider a two-tier memory system consisting of cache (SRAM) and main memory (DRAM). The cache access time is 1 nsec and the main memory access time is 50 nsecs. (1 nsec = 1 ́ 10-9 secs). (a) What is the overall memory access time given a cache hit rate of 95%? (b) What will the cache hit rate need to be if the overall memory access time in (a) is to be halved?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)Consider a 512 KB cache system used in our laptop. The access time for the cache is 25 ns, and the memory access time is 200 ns. Assuming a miss rate of 25%, what would be the average memory access time?
- Consider the following situation: we have a byte-addressable computer with 2-way set associative mapping, 16-bit main memory addresses, and 32 blocks of cache memory. Based on the fact that each block has 8 bytes, figure out how big the offset field should be, and then show your work.Consider a system with 4GB of memory address space. Assuming a write-back policy and block size of 32 bytes, find the space overhead when it uses a (a) 64 KB direct mapped cache(b) fully associative cache (c) eight-way set-associative cacheIf memory read cycle takes 100 ns and a cache read cycle takes 20 ns, then for four continuous references, the first one brings the main memory contents to cache and the next three from cache. Find the time taken for the Read cycle with and without Cache? What is the Percentage speedup obtained?
- Q. Consider a system with 4-way set associative cache of 256 KB. The cache line size is 8 words (32 bits per word). The smallest addressable unit is a byte, and memory addresses are 64 bits long. (a) How many bits are used for TAG and INDEX fields of cache mapping?Suppose a two layer memory hierarchy has a 4 clock pulse hit time, a 35 clock pulse miss penalty, and the miss ratio is 20%. What is the AMAT (in number of clock pulses)?Suppose a 1 MiB L1 cache has an access time of 1 clock cycle, the 16 MiB L2 has an access time of 4 clock cycles, and the 8 GiB DRAM has an average access time of 40 clock cycles. 80% of memory reads are satisfied by the L1 cache. Only 10% have to go to main memory. (a) What is the AMAT following a miss on L1? (b) What is the AMAT for memory overall?