Question

What is CUP-I/O Brust Cycle ?

Answer 1

Almost all processes alternate between two states in a continuing cycle, as shown in Figure 6.1 below :

A CPU burst of performing calculations, and

An I/O burst, waiting for data transfer in or out of the system.

Figure 6.1 - Alternating sequence of CPU and I/O bursts.

CPU bursts vary from process to process, and from program to program, but an extensive study shows frequency patterns similar to that shown in Figure 6.2:

Figure 6.2 - Histogram of CPU-burst durations.