What are the three major components of a queuing system?

1. Arrival process

2. Service mechanism

3. Queue discipline

Explanation:

Arrival Process

Arrivals may originate from one or several sources referred to as the calling population.

The calling population can be limited or 'unlimited'. An example of a limited calling

population may be that of a fixed number of machines that fail randomly. The arrival

process consists of describing how customers arrive to the system. If Ai is the interarrival time between the arrivals of the (i-1)th and ith customers, we shall denote the

mean (or expected) inter-arrival time by E(A) and call it (λ ); = 1/(E(A) the arrival

frequency.

Service Mechanism

The service mechanism of a queuing system is specified by the number of servers

(denoted by s), each server having its own queue or a common queue and the probability distribution of customer's service time. let Si be the service time of the ith customer, we

shall denote the mean service time of a customer by E(S) and µ = 1/(E(S) the service rate

of a server.

Queue Discipline

Discipline of a queuing system means the rule that a server uses to choose the next

customer from the queue (if any) when the server completes the service of the current

customer. Commonly used queue disciplines are:

FIFO - Customers are served on a first-in first-out basis.

LIFO - Customers are served in a last-in first-out manner.

Priority - Customers are served in order of their importance on the basis of their service

requirements.

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