CSCE 2214 Lecture Notes - Lecture 4: Digital Electronics, Clock Rate, Industry Standard Architecture

• School: University of Arkansas
• Department: Computer Science/Computer Engineering
• Course: CSCE 2214
• Professor: miaoqinghuang

Document Summary

Lec 4 8-31-16 ch 1 computer abstractions and. Performance is inversely proportional to execution time = 1/execution time. Relative performance x is n times faster than y. If a program takes 10s to run on a and 20s to run on b the relative performance is calculated by: Performance ratio = execution time b/ execution time a (b is over a because performance = 1/ execution time) Therefore a is 2 times faster than b. Elapsed time = total response time (processing, i/o, os overhead, idle time) Cpu time = time spent processing a given job (excludes i/o time, other devices" tasks) Can be divided into user cpu time (time spent in the program), and system cpu time (cpu time spent in the operating system, tasks on behalf of the program) Compromises user cpu time and system cpu time because it is hard differentiate between the two accurately.