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1. A system has the average cache access time in 50 nanoseconds and the average main...
(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?
Question 3 The access time of a cache is 80 ns and the access time of...
Question 3 The access time of a cache is 80 ns and the access time of main memory is 1200 ns. We have 85% of instructions are directed to read while 15% is for writes. Hit ratio is 92%. A write through procedure is used. A. Give the average access time considering only the read requests B. Give average access time for both read and write requests. C. Give the overall hit ratio given the write cycle as well. Question...
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...
Question 27 Suppose the cache access time is 10ns, main memory access time is 200ns, and...
Question 27 Suppose the cache access time is 10ns, main memory access time is 200ns, and the cache hit rate is 90%. Assuming parallel (overlapped) access, what is the average access time for the processor to access an item?
Question 27 7 pts Suppose the cache access time is 10ns, main memory access time is...
Question 27 7 pts Suppose the cache access time is 10ns, main memory access time is 200ns, and the cache hit rate is 90%. Assuming parallel (overlapped) access, what is the average access time for the processor to access an item? 29ns
A computer system has the following memory timing clock cycle (CC) specification: Cache access ti...
A computer system has the following memory timing clock cycle (CC) specification: Cache access time 1 CC, Main memory access time 100 CC, and Virtual memory access time 100,000 CC. Find the ratio of Average Memory Access Times (AMAT) of the following two programs and determine which program executes faster: B5. cache miss rate : 25% Main memory miss rate Program B: Cache miss rate 20% Main memory miss rates 10% 5%
A computer system has the following memory timing...
Operating Systems Questions (Please help if you can) 1. A computer has cache, main memory, and...
Operating Systems Questions (Please help if you can) 1. A computer has cache, main memory, and a disk used for virtual memory. If a referenced word is in the cache, 20ns are required to access it. If it is in main memory but not in the cache, 60ns are required to load it into the cache (this includes the time to originally check the cache), and then, the reference is started again. If the word is not in main memory,...
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...
In a memory hierarchy organization with three levels of caches and main memory assume that: Cache...
In a memory hierarchy organization with three levels of caches and main memory assume that: Cache Level L1 has access time tc1 = 5ns and hit ratio h1 = 90%, Cache 2 Level L2 has access time tc2 = 15 ns and hit ratio h2 = 80% Cache Level 3 has access time tc3 = 45 and hit ratio h3 = 60% Main memory access time tm = 100 ns. Find average memory access time. You are required to show...
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...
Question 3 The access time of a cache is 80 ns and the access time of main memory is 1200 ns. We have 85% of instructions are directed to read while 15% is for writes. Hit ratio is 92%. A write through procedure is used. A. Give the average access time considering only the read requests B. Give average access time for both read and write requests. C. Give the overall hit ratio given the write cycle as well. Question...
Question 27 Suppose the cache access time is 10ns, main memory access time is 200ns, and the cache hit rate is 90%. Assuming parallel (overlapped) access, what is the average access time for the processor to access an item?
Question 27 7 pts Suppose the cache access time is 10ns, main memory access time is 200ns, and the cache hit rate is 90%. Assuming parallel (overlapped) access, what is the average access time for the processor to access an item? 29ns
A computer system has the following memory timing clock cycle (CC) specification: Cache access time 1 CC, Main memory access time 100 CC, and Virtual memory access time 100,000 CC. Find the ratio of Average Memory Access Times (AMAT) of the following two programs and determine which program executes faster: B5. cache miss rate : 25% Main memory miss rate Program B: Cache miss rate 20% Main memory miss rates 10% 5%
A computer system has the following memory timing...
In a memory hierarchy organization with three levels of caches and main memory assume that: Cache Level L1 has access time tc1 = 5ns and hit ratio h1 = 90%, Cache 2 Level L2 has access time tc2 = 15 ns and hit ratio h2 = 80% Cache Level 3 has access time tc3 = 45 and hit ratio h3 = 60% Main memory access time tm = 100 ns. Find average memory access time. You are required to show...
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...
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> The average access time calculation is wrong.
Average access time = (hit ratio*cache access time)+(1-hit ratio)*(cache access time+main memory access time)
For a miss, first the cache memory is accessed and then the main memory is accessed.
Dinesh DSP Sun, Nov 14, 2021 8:02 AM