Corrected phase-type approximations for the workload of the MAP/G/1 queue with heavy-tailed service times

Eleni Vatamidou, Ivo Adan, Maria Vlasiou, Bert Zwart
2013 Performance Evaluation Review  
In many applications, significant correlations between arrivals of load-generating events make the numerical evaluation of the load of a system a challenging problem. Here, we construct very accurate approximations of the workload distribution of the MAP/G/1 queue that capture the tail behavior of the exact workload distribution and provide a small relative error. Motivated by statistical analysis, we assume that the service times are a mixture of a phase-type and a heavy-tailed distribution.
more » ... th the aid of perturbation analysis, we derive our approximations as a sum of the workload distribution of the MAP/PH/1 queue and a heavy-tailed component that depends on the perturbation parameter. We refer to our approximations as corrected phase-type approximations, and we exhibit their performance with a numerical study.
doi:10.1145/2518025.2518036 fatcat:rdhxnmfhsjggtpexftgeakq3sa