what is an arrival pattern?
Arrival pattern of requests: The arrival pattern describes the distribution of time between request arrivals. The arrival pattern to a queueing system is typically described in terms of the average time between two successive arrivals or the average number of arrivals per some unit of time. The exponential distributions are typically used to model the time between the arrival of requests [2] and [4] The arrival pattern in a queuing process represents the think time in a perform test. Service pattern of tasks: The service pattern describes the distribution of services times. The service times of web requests closely follow long-tailed distributions.