Assume the access time for an L2 cache with a 64 byte cache block is 20...
Assume the access time for an L2 cache with a 64 byte cache block is 20 cycles for the 1st 64 bit (8 byte) word, and an additional 2 cycles for each subsequent word. What is access time (time before L1 can pass incoming data on to processor) for a read of a word at 5ed705 if the full block must be read before using data? With critical word first? With early restart?
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Assume the access time for an L2 cache with a 64 byte cache
block is 20...
I require an unplagiarised solution for the question below A. Consider the usage of critical word...
I
require an unplagiarised solution for the question below
A. Consider the usage of critical word first and early restart on L2 cache misses. Assume a 1 MB L2 cache with 64 byte blocks and a refill path that is 16 bytes wide. Assume that the L2 can be written with 16 bytes every 4 processor cycles, the time to receive the first 16 byte block from the memory controller is 120 cycles, each additional 16 byte block from main...
A (word, bit, block, byte) or (Sector, cache line, page, row) is the unit of data...
A (word, bit, block, byte) or (Sector, cache line, page, row) is the unit of data transferred between cache, memory and the processor. A common size for a block is (64, 16, 32, 4k, 512) (bytes, lines, words, bits)
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...
Question 6 For the following figure shows a hypothetical memory hierarchy going from a virtual address to L2 cache acce...
Question 6 For the following figure shows a hypothetical memory hierarchy going from a virtual address to L2 cache access. The page size is 8KB, the TLB is direct mapped with 128 entries. The L1 cache is a direct mapped 8 KB, and the L2 cache is 2MB and direct mapped. Both use 64 byte blocks. The virtual address is 64 bits and the physical address is 41 bits. For each block in the figure below, fill in the number...
) Consider an 8-way associative 64 Kilo Byte cache with 32 byte cache lines. Assume memory...
) Consider an 8-way associative 64 Kilo Byte cache with 32 byte cache lines. Assume memory addresses are 32 bits long. a). Show how a 32-bit address is used to access the cache (show how many bits for Tag, Index and Byte offset). b). Calculate the total number of bits needed for this cache including tag bits, valid bits and data c). Translate the following addresses (in hex) to cache set number, byte number and tag (i) B2FE3053hex (ii) FFFFA04Ehex...
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...
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 short program loop goes through a 16 kB array one word at a time, reads...
A short program loop goes through a 16 kB array one word at a time, reads a number from the array, adds a random number, and stores the result in the corresponding entry in another array that is located in the memory immediately following the first array. An outer loop repeats the above operation 100 times. The 64-bit processor, operating at a clock frequency of 4 GHz, is pipelined, has 48 address lines, three levels of caches with a 64...
I
require an unplagiarised solution for the question below
A. Consider the usage of critical word first and early restart on L2 cache misses. Assume a 1 MB L2 cache with 64 byte blocks and a refill path that is 16 bytes wide. Assume that the L2 can be written with 16 bytes every 4 processor cycles, the time to receive the first 16 byte block from the memory controller is 120 cycles, each additional 16 byte block from main...
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...
Question 6 For the following figure shows a hypothetical memory hierarchy going from a virtual address to L2 cache access. The page size is 8KB, the TLB is direct mapped with 128 entries. The L1 cache is a direct mapped 8 KB, and the L2 cache is 2MB and direct mapped. Both use 64 byte blocks. The virtual address is 64 bits and the physical address is 41 bits. For each block in the figure below, fill in the number...
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...
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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