Memory operations currently take 40% of execution time. A new widget called a “L1 Cache” speed up 60% of memory operations by a factor of 4. A second new widget called a “L2 cache” speeds up half of the remaining memory operations by a factor or 2. What is the overall speed up?

Memory operations currently take 40% of execution time. A new widget called a “L1 Cache” speed up 60% of memory operations by a factor of 4. A second new widget called a “L2 cache” speeds up half of the remaining memory operations by a factor or 2. What is the overall speed up?

Principles of Information Systems (MindTap Course List)

13th Edition

ISBN:9781305971776

Author:Ralph Stair, George Reynolds

Publisher:Ralph Stair, George Reynolds

Chapter3: Hardware And Mobile Devices

Section: Chapter Questions

Problem 6SAT: LI is the fastest type of cache memory built into a computer, faster even than DDR4 SDRAM memory....

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Types of database architectures

A Database Architecture represents the Database Management System’s (DBMS) design (schema). The DBMS architecture makes it easy to understand the components involved in the database system and their relations. The DBMS architecture may vary based on the system on which it runs. Some systems contain both client and server machines whereas some run only on a server machine. Based on the architecture, the system can be classified as centralized, decentralized, or hierarchical.

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OPERATING SYSTEMS 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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If the data is too large for the cache, a write buffer will return it to the CPU from main memory. Next steps?
What happens if the central processing unit (CPU) makes a request that cannot be satisfied by the cache while relocating a block back to main memory from the write buffer?