Computer Architecture: A Quantitative Approach, 4th Edition

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1 University of California, Berkeley College of Engineering Computer Science Division EECS Fall 1999 John Kubiatowicz Prerequisite Quiz SOLUTIONS September 1, 1999 CS252 Computer Architecture and Engineering This prerequisite quiz will be used in determining class admissions. Good Luck! Your Name: SID Number: Discussion Section: 1 2 3 Total P
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2 1) Assume that we have a 32-bit processor with 32-bit words, and that this processor is byte-addressed (i.e. addresses specify bytes). Now, suppose that this processor has a 32-word, two-way, set- associative cache (LRU replacement) with 2-word cache lines. a) Split the 32-bit address into “tag”, “index”, and “cache-line offset” pieces. We start you off with one of these. tag: 31 - 6 index: 5 - 3 cache-line offset: bits 2 - 0 b) Assume that the processor makes the following byte accesses. Label each reference address as a Hit (H) or a Miss (M). Also, identify each cache miss as a compulsory, conflict, or capacity miss. Blank working space is available on the next page. Byte Address Hit/Miss? Miss Type 6 (0x006) M Compulsory 76(0x04C) M Compulsory 43(0x02B) M Compulsory 122(0x07A) M Compulsory 168(0x0A8) M Compulsory 207(0x0CF) M Compulsory 46(0x02E) H 72(0x048) H 238(0x0EE) M Compulsory 75(0x04B) H 172(0x0AC) M Conflict 40(0x028) M Conflict 203(0x0CB) H 170(0x0AA) H c) Calculate the cache hit rate (you can leave as a fraction). (hits) / (total accesses) = 5 / 14
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3 [ This page left as scratch for problem #1] All misses are compulsory if the cache has never seen that line before. Misses are capacity misses if a fully associative cache of the same size would experience the same miss (because increasing the size would solve the problem). Otherwise, it is a conflict miss (because increasing the associativity would solve the problem). 0
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  • Spring '07
  • Kubiatowicz
  • Computer Architecture, SEPTA Regional Rail, Central processing unit, CPU cache, Cache algorithms, Compulsory Compulsory Compulsory Compulsory Compulsory

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