Which of the following Boolean operations produces the output O for the fewest number of possible input patterns?
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- b. Cache memory systems are designed such that the computer first checks the L1 cache for the desired memory. If the data is there, it accesses it and is done. It only checks the L2 cache if the data is not found in the L1 cache. Likewise, the computer checks the L3 cache if the desired data is not found in the L2 cache, and finally it on only checks main memory if the data is not found in the L3 cache. Imagine a computer system with the following cache access times: L1 cache: 3 processor cycles L2 cache: 10 processor cycles L3 cache: 25 processor cycles Main memory: 100 processor cycles So, in the best case, the desired data-would be immediately found in the L1 cache, which requires only 3 cycles to check. Conversely, in the worst case, the desired data would only be in main memory, which would require 138 cycles to access (3 cycles to check L1 cache + 10 cycles to check L2 + 25 cycles to check L3 + 100 cycles to access main memory). What is important, however, is the average amount…The write buffer will return a block to main memory while the CPU submits a cache-unmet request. What may happen next?In designing a computer’s cache system, the cache block or cache line size is an important parameter. Which of the following statements is correct in this context? A smaller block size implies better spatial locality A smaller block size implies a smaller cache tag and hence lower cache tag overhead A smaller block size implies a larger cache tag and hence lower cache hit time A smaller bock size incurs a lower cache miss penalty
- What should happen if the processor issues a request that triggers a cache hit while it is in the midst of flushing a block from the write buffer back to main memory?In the event that a request cannot be fulfilled by the cache, the processor will submit a request to main memory while the write buffer delivers the relevant data block. What steps need to be taken here?Cache memory systems are designed such that the computer first checks the L1 cache for the desired memory. If the data is there, it accesses it and is done. It only checks the L2 cache if the data is not found in the L1 cache. Likewise, the computer checks the L3 cache if the desired data is not found in the L2 cache, and finally it on only checks main memory if the data is not found in the L3 cache. Imagine a computer system with the following cache access times: L1 cache: 3 processor cycles L2 cache: 10 processor cycles L3 cache: 25 processor cycles Main memory: 100 processor cycles So, in the best case, the desired data would be immediately found in the L1 cache, which requires only 3 cycles to check. Conversely, in the worst case, the desired data would only be in main memory, which would require 138 cycles to access (3 cycles to check L1 cache + 10 cycles to check L2 + 25 cycles to check L3 + 100 cycles to access main memory). What is important, however, is the average…
- Suppose a computer using fully associative cache has 4G bytes of byte-addressable main memory and a cache of 512 blocks, where each cache block contains 128 bytes. a) How many blocks of main memory are there? b) What is the format of a memory address as seen by the cache, i.e., what are the sizes of the tag and offset fields? c) To which cache block will the memory address 0x018072 map?What should happen if a CPU issues a cache-unfulfilled request while a block is being flushed from the write buffer back to main memory?A request that cannot be satisfied in the cache is issued by the processor while the write buffer returns a block to main memory. What should happen in this case?
- When a block is being returned from the write buffer to main memory, what should the CPU do if a cache request arrives at the same time?By sending a block from the write buffer to main memory, the processor initiates a cache request that is not completed. Next, do this.Suppose a computer using fully associative cache has 4 GB of byte-addressable main memory and a cache of 256 blocks, where each block contains 256 bytes. a) How many blocks of main memory are there? b) What is the format of a memory address as seen by the cache, i.e., what are the sizes of the tag and offset fields? c) To which cache block will the memory address 0X1A1B1C1D map?