Give two reasons why caches are useful. What problems do they solve? What problems do they cause? If a cache can be made as large as the device for which it is caching (for instance, a cache as large as a disk), why not make it that large and eliminate the device?

Give two reasons why caches are useful. What problems do they solve? What problems do they cause? If a cache can be made as large as the device for which it is caching (for instance, a cache as large as a disk), why not make it that large and eliminate the device?

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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Question

Give two reasons why caches are useful. What problems do they
solve? What problems do they cause? If a cache can be made as
large as the device for which it is caching (for instance, a cache as
large as a disk), why not make it that large and eliminate the
device?

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Give two reasons why caches are useful. What problems do they solve? What problems do they cause? If a cache can be made as large as the device for which it is caching (for instance, a cache as large as a disk), why not make it that large and eliminate the device?
For a direct-mapped cache design with a 32-bit address, the following bits of the address are used to access the cache.Tag Index Offset31–10 9–5 4–01. What is the cache block size (in words)?2. How many entries does the cache have?3. What is the ratio between total bits required for such a cache implementation over the data storage bits?Starting from power on, the following byte-addressed cache references are recorded. Address 0 4 16 132 232 160 1024 30 140 3100 180 2180 How many blocks are replaced? What is the hit ratio? List the fi nal state of the cache, with each valid entry represented as a record of <index, tag, data>
Make the difference between a cache that is directly mapped and one that is totally associative.
Consider the difference between a cache that is totally associative and one that is directly mapped.
"Spatial locality" and "temporal locality" boost performance with caches. These two events benefit caches.
Think about the difference that exists between a cache that is totally associative and one that is directly mapped. This is a distinction that has to be made.
Given the following setup, how many words can be stored in the cache at the same time when the cache is full? A. Direct mapped cache Tag (T) Index (I) Word (W) Byte (B) 17 11 2 2 B. 2-way associative cache Tag (T) Index (I) Word (W) Byte (B) 18 10 2 2 C. 4-way associative cache Tag (T) Index (I) Word (W) Byte (B) 19 9 2 2 D. Fully associative cache Tag (T) Index (I) Word (W) Byte (B) 28 0 2 2
In order to improve performance, caches are used to take advantage of "spatial locality" and "temporal locality." In what ways do caches make advantage of these two phenomena?
Explain how caches use "spatial locality" and "temporal locality" for performance. Caches exploit these two phenomena differently.
There are a few different reasons why caches are useful. What exactly is the point of all of their hard work? What are the repercussions of making use of them? Why not simply make the cache the same size as the device it is caching, in the event of a cache (for example, a whole hard drive)?
To better understand how caches work, it helps to know how "spatial locality" and "temporal locality" are used. These two occurrences are used in distinct ways by caches.
For a direct-mapped cache design with a 32-bit address, the following bits of the address areused to access the cache.Tag Index Offset31–10 9–6 5–0a– What is the cache block size (in words)? b – How many entries does the cache have? c – What is the ratio between total bits required for such a cache implementation overthe data storage bits?