What is CPU utilization?

Answer 1

processor utilization is the average fraction of time during which the processor is busy, we mean that the processor is either executing the user processes or operating system processes. processor utilization is generally measured by using a NULL process that runs when no other process is running. process utilization should range from 40% to 90%.

Answer 2

High utilization for the CPU does not always indicate a performance problem. The CPU performs all calculations that are needed to process transactions. The more transaction-related calculations that it performs within a given period, the higher the throughput will be for that period. As long as transaction throughput is high and seems to remain proportional to CPU utilization, a high CPU utilization indicates that the computer is being used to the fullest advantage.

On the other hand, when CPU utilization is high but transaction throughput does not keep pace, the CPU is either processing transactions inefficiently or it is engaged in activity not directly related to transaction processing.

Processor utilization is controlled by the o/s for different programs.

The use of automatic job sequencing is good but still it did not provide the result expected,

because of the slow nature of the i/o devices, let us look a representative example to see the

utilization of a processor resource, while reading and writing one record to a file.

Suppose a typical execution scenario:

CPU Utilization = 0.0001/0.0031

= 0.032 = 3.2 %

This shows that only 3.2% of the time of CPU processor is being utilized effectively.