Assume we have a computer where the clocks per instruction is 1.0 when all memory accesses hit in the cache. The only data accesses are loads and stores and these total 50% of the instructions. If the miss penalty is 25 clock cycles and the miss rate is 2%, how much faster would the computer be if all instructions were cache hits?
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Assume we have a computer where the clocks per instruction is 1.0 when all memory accesses hit in the cache. The only data accesses are loads and stores and these total 50% of the instructions. If the miss penalty is 25 clock cycles and the miss rate is 2%, how much faster would the computer be if all instructions were cache hits?
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- A program sees a 4% miss rate on both the Instruction Cache and the Data Cache. Every instruction requires access to the Instruction cache. Only 35% of the instructions require data access from the Data Cache. The miss penalty for either the data or the instruction cache is 100 cycles. Assume the average Clocks per Instruction (CPI) is 2 without any memory stalls (this is a hypothetical machine where if there were no misses on that instruction, it would get executed in 2 clock cycles. We are not worrying about how it is implemented, just, that suppose it was possible). Assume the number of instructions in a program is X. F1: What is the number of 'instruction miss cycles'? (The number of clock cycles lost due to a miss on the Instruction Cache) F2: What is the number of 'data miss cycles'? F3: What is the total run time of the program including the missed cycles dues to data and instruction misses?A program sees a 4% miss rate on both the Instruction Cache and the Data Cache. Every instruction requires access to the Instruction cache. Only 35% of the instructions require data access from the Data Cache. The miss penalty for either the data or the instruction cache is 100 cycles. Assume the average Clocks per Instruction (CPI) is 2 without any memory stalls (this is a hypothetical machine where if there were no misses on that instruction, it would get executed in 2 clock cycles. We are not worrying about how it is implemented, just, that suppose it was possible). Assume the number of instructions in a program is X. F1: What is the number of 'instruction miss cycles'? (The number of clock cycles lost due to a miss on the Instruction Cache) F2: What is the number of 'data miss cycles'? F3: What is the total run time of the program including the missed cycles dues to data and instruction misses? F4: What is the ratio of the actual run time (from question F3 above) to the…Consider a processor running a program. 30% of the instructions of which require a memory read or write operation if the cache bit ratio is 0.95 for instructions and 0.9 for data. When a cache bit occurs for instruction or for data, only one clock is needed while the cache miss penalty is 17 clocks to read/write on the main memory. Work out the time saved by using the cache, given the total number of instructions executed is 1 million.
- A program sees a 4% miss rate on both the Instruction Cache and the Data Cache. Every instruction requires access to the Instruction cache. Only 35% of the instructions require data access from the Data Cache. The miss penalty for either the data or the instruction cache is 100 cycles. Assume the average Clocks per Instruction (CPI) is 2 without any memory stalls (this is a hypothetical machine where if there were no misses on that instruction, it would get executed in 2 clock cycles. We are not worrying about how it is implemented, just, that suppose it was possible). Assume the number of instructions in a program is X. F3: What is the total run time of the program including the missed cycles dues to data and instruction misses? F4: What is the ratio of the actual run time (from question F3 above) to the fictitious run time if there were no cache misses at all?Consider a computer with cache, DRAM, HDD memory hierarchy. The hit rate of cache is 90% and DRAM is 95%. Read latencies of cache, DRAM, and HDD are 5ns, 100ns, and 1ms respectively. What is the average latency of executing an instruction involving a memory read? Express your answer in micro-seconds. Round it to the nearest integer. Enter your answer here3. Assume you have a computer where the cycles per Instruction(CPI) is 1 when all the memory accesses hit in the cache. The only data accesses are loads and stores and these total 25% of the instructions.If the miss penalty is 50 clock cycles and the miss rate is 1%, how much faster would the computer if all the instructions were cache hits?
- Consider a computer system that has the following characteristics: The memory bus runs at 400 MHz. The memory bus is 8 bytes wide. Accessing a memory address in memory requires 8 memory bus cycles. The disk drives can each read a block every 4 milliseconds. Disk blocks read are 8 kilobytes each. Assume Direct Memory Access from the disk drive. What is the highest percentage of the memory bus capacity that could be consumed by the disk’s Direct Memory Access if there are 4 disk drives in use?Consider a CPU with clock cycle of 10ns that executes program A in 100 clock cycles and access the memory for 50 times during the execution. The CPU uses the cache with miss rate of 7% and Miss Penalty time of 40 ns. Compare the CPU execution time with and without Cache missAsap
- Assume the miss rate of an instruction cache is 2% and the miss rate of the data cache is 4%. If a processor has a CPI of 2 without any memory stalls and the miss penalty is 100 cycles for all misses, determine how much faster a processor would run with a perfect cache that never missed. Assume the frequency of all loads and stores is 36%.Suppose you had a computer that, on average, exhibited the following properties on the programs that you run: Cache miss rate: 2.5% Percentage of memory instructions (load/store): 40% Miss penalty: 70 cycles There is no penalty for a cache hit (i.e. the cache can supply the data as fast as the processor can consume it). Find CPI and speed-up against CPI of CPU with the ideal cache. Compare its CPI to the CPI of CPU w/no cache.The memory access time is 1 nanosecond for a read operation with a hit in cache, 5 nanoseconds for a read operation with a miss in cache, 2 nanoseconds for a write operation with a hit in cache and 10 nanoseconds for a write operation with a miss in cache. Execution of a sequence of instructions involves 100 instruction fetch operations, 60 memory operand read operations and 40 memory operand write operations. The cache hit-ratio is 0.9. The average memory access time (in nanoseconds) in executing the sequence of instructions will be ?