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System Architecture and Reliability

Among the measures used to evaluate the performance of an online processing system, which describes response time?

  1. AThe time from when the user finishes entering a processing request until the system starts outputting the result
  2. BThe time from when a processing request starts being entered until the output of the result is completely finished
  3. CThe amount of work the system can process per unit time
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Answer: A. The time from when the user finishes entering a processing request until the system starts outputting the result

Response time is the time from when the user finishes entering a processing request at a terminal until the system starts outputting the result. It is especially important in online processing, where users wait in front of the screen. The time from submitting a job until all of its results have been output is called turnaround time and is used mainly to evaluate batch processing. The amount of work per unit time is throughput.

  • A. Correct. It is the time from the end of input to the start of output.
  • B. This is close to turnaround time and includes the time until the output is finished.
  • C. This describes throughput.
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