Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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- Caches are important to providing a high-performance memory hierarchy to processors.Below is a sequence of ten memory references in binary to an empty eight- one word blockcache. 10110,11010,10110,11010, 10000, 00011, 10000, 10010, 10000, 10111For each of these references tabulate the tag, valid bit status, the index, and the data givena direct-mapped cache. Also list if each reference is a hit or a miss, assuming the cache isinitially empty.arrow_forwardThis function will be able to look at which fields in a log entry that it needs to. When you use 64-byte cache blocks and don't prefetch, the following code calculates the average number of cache misses for each entry in the cache.arrow_forwardCaches are important to providing a high-performance memory hierarchy to processors. Below is a list of 32-bit memory address references, given as word addresses.3, 180, 43, 2, 191, 88, 190, 14, 181, 44, 186, 253For each of these references, identify the binary address, the tag, and the index given a direct-mapped cache with 16 one-word blocks. Also list if each reference is a hit or a miss, assuming the cache is initially empty.For each of these references, identify the binary address, the tag, and the index given a direct-mapped cache with two-word blocks and a total size of 8 blocks. Also list if each reference is a hit or a miss, assuming the cache is initially empty.For each of these references, identify the binary address, the tag, and the index given a direct-mapped cache with two-word blocks and a total size of 8 blocks. Also list if each reference is a hit or a miss, assuming the cache is initially empty.arrow_forward
- Using the references from Exercise 5.2, show the final cache contents for a fully associative cache with one-word blocks and a total size of 8 words. Use LRU replacement. For each reference identify the index bits, the tag bits, and if it is a hit or a miss.arrow_forwardConsider about the difference between a directly mapped cache and a totally associative cache.arrow_forwardHow does a totally associative cache function?arrow_forward
- Q20: Assuming an initially empty 2-way set associative cache with a block size of 2 words and a total of 4 sets, which is using a LRU replacement policy. Complete the following table showing the cache after all the following block accesses: Set index V TAG 1 2 3 1, 5, 2, 1, 3, 9 DATA DATA V TAG DATA DATAarrow_forwardAssume a direct-mapped cache that holds 4096 bytes, in which each block is 16 bytes.Assuming that an address is 32 bits and that cache is initially empty:a. Complete the table that follows. (You should use hexadecimal numbers for allanswers).b. Which, if any, of the addresses will cause a collision (forcing the block that was justbrought in to be overwritten) if they are accessed one right after the other? Explainarrow_forwardReplacement Policies Consider a cache using the Least Recently Used (LRU) policy with 16 blocks. If the sequence of memory block accesses is 3, 5, 2, 1, 5, 3, 4, 2, 1, what blocks will be present in the cache after these accesses?arrow_forward
- Make the difference between a cache that is directly mapped and one that is totally associative.arrow_forwardA. Does a set-associative cache need extra bits to represent how long a particular cached word has been in the cache? B. Explain why or why not? C. How is this different than set-associative and direct caches?arrow_forwardKeep in mind the difference between a fully associative cache and a directly mapped cache.arrow_forward
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