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A computer system has the following memory timing clock cycle (CC) specification: Cache access ti...
4B, 20%) compare performance of a Processor with cache vs. without cache. Assume an Ideal processor with 1 cycle memory access, CPI1 Assume main memory access time of 8 cycles Assume 40% instruct...
4B, 20%) compare performance of a Processor with cache vs. without cache. Assume an Ideal processor with 1 cycle memory access, CPI1 Assume main memory access time of 8 cycles Assume 40% instructions require memory data access Assume cache access time of I cycle Assume hit rate 0.90 for instructiens, 0.80 for data Assume miss penalty (time to read memory inte cache and from cache to Processor with cache processor) is 10 cycles >Compare execution times of 100-thousand instructions:
4B,...
Question 4 - [25 Points] Part (a) - Average Access Time (AMAT) The average memory access time for a microprocessor with One (1) level (L1) of cache is 2.4 clock cycles - If data is present and val...
Question 4 - [25 Points] Part (a) - Average Access Time (AMAT) The average memory access time for a microprocessor with One (1) level (L1) of cache is 2.4 clock cycles - If data is present and valid in the cache, it can be found in 1 clock cycle If data is not found in the cache, 80 clock cycles are needed to get it from off- chip memory Designers are trying to improve the average memory access time to...
a) Calculate the AMAT for a cache system with one level of cache between the CPU...
a) Calculate the AMAT for a cache system with one level of cache between the CPU and Main Memory. Assume that the cache has a hit time of 1 cycle and a miss rate of 11%. Assume that the main memory requires 300 cycles to access (this is the hit time) and that all instructions and data can be found in the main memory (there are no misses). b) Let us modify the cache system from part (a) and add...
Compare two designs of a computing system. (i) 1KB L1 cache with misss-rate of 11% and...
Compare two designs of a computing system. (i) 1KB L1 cache with misss-rate of 11% and hit-time of 0.62ns. (ii) 2KB L1 cache with miss-rate of 8% and hit-time of 0.66ns . For both the main memory access takes 80ns. (a) Assuming that the L1 hit-time determines the processor cycle time, what are the clock frequencies of the two designs? (b) Calculate the Average Memory Access Time (AMAT) for the two designs
For a special computer system with 3 levels of cache, here are the hit times and...
For a special computer system with 3 levels of cache, here are
the hit times and miss % for the different levels of cache
Please calculate the access time for this computer system.
Hit Miss% L1 Cache 1 Cycle 5% L2 Cache 5 Cycles 10% L3 Cache 20 Cycles 15% Main Memory 100 Cycles 20%
(a) A computer system with a cache memory has an average memory access time of TM=...
(a) A computer system with a cache memory has an average memory access time of TM= 50 ns with a hit ratio of h= 80%. The primary memory access time is TP=120 ns. What is the cache memory access time, TC?
6. Memory Access Time [15 points] Consider a MIPS processor that includes a cache, a main...
6. Memory Access Time [15 points] Consider a MIPS processor that includes a cache, a main memory, and a hard drive. Access times of cache memory, main memory, and hard drive are 5 ns, 200 ns, and 1000 ns, respectively. Assume that cache memory is divided into instruction cache and data cache. Assume that data cache has a 90% hit rate. Assume that main memory has a 98% hit rate and hard drive is perfect (it has a 100% hit...
1. Cache memory (8pts) Consider adding cache to a processor-memory system design. The microprocessor without cache needs 12 clock cycles to read a 16-bit word from the memory. With cache, it take...
1. Cache memory (8pts) Consider adding cache to a processor-memory system design. The microprocessor without cache needs 12 clock cycles to read a 16-bit word from the memory. With cache, it takes only 4 clock cycles if the data happens to be in the cache and a total 20 clock cycles including the cache misses. a. What is the performance ratio of the cache system to the non-cache system given a hit rate of 80%? b. For what hit rate...
1. Cache memory (8pts) Consider adding cache to a processor-memory system desigrn. The microprocessor without cache needs 12 clock cycles to read a 16-bit word from the memory. With cache, it takes o...
1. Cache memory (8pts) Consider adding cache to a processor-memory system desigrn. The microprocessor without cache needs 12 clock cycles to read a 16-bit word from the memory. With cache, it takes only 4 clock cycles if the data happens to be in the cache and a total 20 clock cycles including the cache misses a. What is the performance ratio of the cache system to the non-cache system given a hit rate of 80%? b. For what hit rate...
(a)What is the average memory access time (AMAT) if a cache uses write-back strategy and 20%...
(a)What is the average memory access time (AMAT) if a cache uses write-back strategy and 20% of the data blocks to be swapped out are dirty. Assume that the miss rate is 15%, the hit time of the cache is 1 cycle and the miss penalty is 8 cycles for the data blocks that are not dirty and 20 cycles for those blocks that are dirty. (b) What is the speedup up if we add a “write-buffer” that eliminates 40%...
4B, 20%) compare performance of a Processor with cache vs. without cache. Assume an Ideal processor with 1 cycle memory access, CPI1 Assume main memory access time of 8 cycles Assume 40% instructions require memory data access Assume cache access time of I cycle Assume hit rate 0.90 for instructiens, 0.80 for data Assume miss penalty (time to read memory inte cache and from cache to Processor with cache processor) is 10 cycles >Compare execution times of 100-thousand instructions:
4B,...
Question 4 - [25 Points] Part (a) - Average Access Time (AMAT) The average memory access time for a microprocessor with One (1) level (L1) of cache is 2.4 clock cycles - If data is present and valid in the cache, it can be found in 1 clock cycle If data is not found in the cache, 80 clock cycles are needed to get it from off- chip memory Designers are trying to improve the average memory access time to...
For a special computer system with 3 levels of cache, here are
the hit times and miss % for the different levels of cache
Please calculate the access time for this computer system.
Hit Miss% L1 Cache 1 Cycle 5% L2 Cache 5 Cycles 10% L3 Cache 20 Cycles 15% Main Memory 100 Cycles 20%
1. Cache memory (8pts) Consider adding cache to a processor-memory system design. The microprocessor without cache needs 12 clock cycles to read a 16-bit word from the memory. With cache, it takes only 4 clock cycles if the data happens to be in the cache and a total 20 clock cycles including the cache misses. a. What is the performance ratio of the cache system to the non-cache system given a hit rate of 80%? b. For what hit rate...
1. Cache memory (8pts) Consider adding cache to a processor-memory system desigrn. The microprocessor without cache needs 12 clock cycles to read a 16-bit word from the memory. With cache, it takes only 4 clock cycles if the data happens to be in the cache and a total 20 clock cycles including the cache misses a. What is the performance ratio of the cache system to the non-cache system given a hit rate of 80%? b. For what hit rate...
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