6. Suppose you had a computer that, on average, exhibited the following properties on the programs that you run: Instruction miss rate: 2.5% Data miss rate: 8.0% Percentage of memory instructions: 25% Miss penalty: 100 cycles There is no penalty for a cache hit (i.e. the cache can supply the data as fast as the processor can consume it). Assume also that a cache-block is one word. You are planning to upgrade the memory to one that is twice as fast. How much faster is the system with the new memory than the original system?
6. Suppose you had a computer that, on average, exhibited the following properties on the programs that you run: Instruction miss rate: 2.5% Data miss rate: 8.0% Percentage of memory instructions: 25% Miss penalty: 100 cycles There is no penalty for a cache hit (i.e. the cache can supply the data as fast as the processor can consume it). Assume also that a cache-block is one word. You are planning to upgrade the memory to one that is twice as fast. How much faster is the system with the new memory than the original system?
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
Problem 1PE
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![6. Suppose you had a computer that, on average, exhibited the following properties
on the programs that you run:
Instruction miss rate: 2.5%
Data miss rate: 8.0%
Percentage of memory instructions: 25%
Miss penalty: 100 cycles
There is no penalty for a cache hit (i.e. the cache can supply the data as
fast as the processor can consume it). Assume also that a cache-block is one
word. You are planning to upgrade the memory to one that is twice as fast. How
much faster is the system with the new memory than the original system?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F27c24788-db2f-4e88-b737-a93b42ad65a5%2Fbad62435-c679-4500-a043-4bcc194192a3%2Fb4jn0n_processed.jpeg&w=3840&q=75)
Transcribed Image Text:6. Suppose you had a computer that, on average, exhibited the following properties
on the programs that you run:
Instruction miss rate: 2.5%
Data miss rate: 8.0%
Percentage of memory instructions: 25%
Miss penalty: 100 cycles
There is no penalty for a cache hit (i.e. the cache can supply the data as
fast as the processor can consume it). Assume also that a cache-block is one
word. You are planning to upgrade the memory to one that is twice as fast. How
much faster is the system with the new memory than the original system?
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Step 1: Determine an introduction for given query:
VIEWStep 2: Calculate the effective memory access time (EMAT) for the original system:
VIEWStep 3: Calculate the number of memory accesses per instruction (MAPI):
VIEWStep 4: Calculate the CPU time for the original system:
VIEWStep 5: Upgrade the memory to one that is twice as fast. This means the miss penalty is halved:
VIEWStep 6: Calculate the new EMAT for the upgraded system:
VIEWStep 7: Calculate the new CPU time for the upgraded system and the speedup:
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