Theory Lunch Seminar / Computer Science Speaking Skills Talk

Wednesday, October 7, 2020 – 12:00pm to 1:00pm


Virtual Presentation Remote Access Enabled – Zoom


ISAAC GROSOF, Ph.D. Student https://isaacg1.github.io/

Stability for Two-class Multiserver-job Systems

Multiserver-job systems, where jobs require concurrent service at many servers, occur widely in practice. Much is known in the dropping setting, where jobs are immediately discarded if they require more servers than are currently available. However, very little is known in the more practical setting where jobs queue instead.

In this talk, I will present a closed-form analytical expression for the stability region of a two-class (non-dropping) multiserver-job system where each class of jobs requires a distinct number of servers and requires a distinct exponential distribution of service time, and jobs are served in first-come-first-served (FCFS) order. This is the first result of any kind for an FCFS multiserver-job system where the classes have distinct service distributions. Our work is based on a technique that leverages the idea of a saturated system, in which an unlimited number of jobs are always available.

Our analytical formula provides insight into the behavior of FCFS multiserver-job systems, highlighting the huge wastage (idle servers while jobs are in the queue) that can occur, as well as the nonmonotonic effects of the service rates on wastage.

Presented in Partial Fulfillment of the CSD Speaking Skills Requirement.
To be presented as part of the CMU Theory Lunch.

Zoom Participation. See announcement.  

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