Paper Info
Title
M/M/c Queue with Two Priority Classes
Abstract
This paper provides the first exact analysis of a preemptive M/M/c queue with two priority classes having different service rates. To perform our analysis, we introduce a new technique to reduce the two-dimensionally infinite Markov chain (MC), representing the two class state space, into a one-dimensionally infinite MC, from which the generating function (GF) of the number of low-priority jobs can be derived in closed form. (The high-priority jobs form a simple M/M/c system and are thus easy to solve.) We demonstrate our methodology for the c = 1, 2 cases; when c > 2, the closed-form expression of the GF becomes cumbersome. We thus develop an exact algorithm to calculate the moments of the number of low-priority jobs for any c >= 2. Numerical examples demonstrate the accuracy of our algorithm and generate insights on (i) the relative effect of improving the service rate of either priority class on the mean sojourn time of low-priority jobs; (ii) the performance of a system having many slow servers compared with one having fewer fast servers; and (iii) the validity of the square root staffing rule in maintaining a fixed service level for the low-priority class. Finally, we demonstrate the potential of our methodology to solve other problems using the M/M/c queue with two priority classes, where the high-priority class is completely impatient.
Year
DOI
Venue
2015
10.1287/opre.2015.1375
OPERATIONS RESEARCH
Field
DocType
Volume
M/M/1 queue,M/D/1 queue,M/M/c queue,M/G/1 queue,M/G/k queue,M/D/c queue,Priority queue,M/M/∞ queue,Operations management,Mathematics
Journal
63
Issue
ISSN
Citations 
3
0030-364X
6
PageRank 
References 
Authors
0.62
9
3
Name
Order
Citations
PageRank
Jianfu Wang1102.38
Opher Baron214514.64
Scheller-Wolf Alan362055.56