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Q.2. ( A computer system has a cache (L1). For a given program with 1 million instructions, LI cache miss rate is 20%. Average instruction execution time is 40 ns. For all misses, time to take a block from main memory into the LI cache is 600ns. a. Calculate the time to execute this program. Give your result in milliseconds. b. You need to improve the performance of this system. You replace the cache by a new one that is 2 times faster than the existing one, but the new cache has smaller capacity, so the miss rate is increased to 25%. Will the new design improve the performance? Calculate the execution time of the program and prove your answer.

Q.2. ( A computer system has a cache (L1). For a given program with 1 million instructions, LI cache miss rate is 20%. Average instruction execution time is 40 ns. For all misses, time to take a block from main memory into the LI cache is 600ns. a. Calculate the time to execute this program. Give your result in milliseconds. b. You need to improve the performance of this system. You replace the cache by a new one that is 2 times faster than the existing one, but the new cache has smaller capacity, so the miss rate is increased to 25%. Will the new design improve the performance? Calculate the execution time of the program and prove your answer.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Q.2. A computer system has a cache (L1). For a given program with 1 million instructions, L1 cache miss rate is 20%. Average instruction execution time is 40 ns. For all misses, time to take a block from main memory into the LI cache is 600ns. a. Calculate the time to execute this program. Give your result in milliseconds. b. You need to improve the performance of this system. You replace the cache by a new one that is 2 times faster than the existing one, but the new cache has smaller capacity, so the miss rate is increased to 25%. Will the new design improve the performance? Calculate the execution time of the program and prove your answer.
Transcribed Image Text:Q.2. A computer system has a cache (L1). For a given program with 1 million instructions, L1 cache miss rate is 20%. Average instruction execution time is 40 ns. For all misses, time to take a block from main memory into the LI cache is 600ns. a. Calculate the time to execute this program. Give your result in milliseconds. b. You need to improve the performance of this system. You replace the cache by a new one that is 2 times faster than the existing one, but the new cache has smaller capacity, so the miss rate is increased to 25%. Will the new design improve the performance? Calculate the execution time of the program and prove your answer.
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