There are a variety of queuing modes for ships to enter the ports. Then through a port handling example, compare
M/M/1 to M/M/s two kinds of queuing modes. For an instance, there is a port somewhere, with 3 handling servers.
The average ratio for the arrival of ships is λ=0.9 per hour, while the average ratio for service is μ=0.5 per hour. The
arrival process for ships obeys the Poisson distribution while the time for handling service obeys the negative
exponential distribution. After entering the port, the ships will join the queue to wait for accepting the handling
service.
(1) There would be 3 queues if the ships join into the each queue before 3 servers separately after the arrival. The
arrival ratio for each the queue is 0.9 / 3 0.3 1 2 3 λ = λ = λ = = , and this moment, the system is 3 subsystems of
M/M/1.