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The Performance of any particular system is determined by carefully analysing certain performance measures like Response Times, Throughputs and Utilizations. These measures can be obtained as ouputs of performance models.
It is the average time interval elapsed between the instant a transaction is submitted to the system for processing until the answer begins to appear at the user's terminal.
For example, the response time for a balance enquiry transaction of a banking system is 16 seconds.
It is the average number of transactions or jobs executed per unit time. In other words, it is the rate at which requests are serviced.
For example, the throughput of a `statement generation' job in a banking system is 100 statements or transactions/hour or 0.5 statements/sec and so on.
It is the percentage of time the device is being used, during a given time interval. A device is said to be saturated if its utilization approaches 100%.
For example, the utilization of a disk which contains all the balance information is maximum or, say, 80% during statement generation process.