Performance metrics (หน่วยการวัดประสิทธิภาพ) are typically expressed in response time (R), throughput (X), or utilization (U) of a system, depending on the load to be processed
The response time is generally defined as the time between sending a request to the system and receiving an answer from that system
The throughput states how many requests can be served per time unit
The utilization tells us the percentage in which the system was busy