## Abstract

We consider the following distributed service model: jobs with unit mean, exponentially distributed, and independent processing times arrive as a Poisson process of rate A N, with 0 < λ < 1, and are immediately dispatched to one of several queues associated with N identical servers with unit processing rate. We assume that the dispatching decisions are made by a central dispatcher endowed with a finite memory, and with the ability to exchange messages with the servers. We study the fundamental resource requirements (memory bits and message exchange rate), in order to drive the expected steady-state queueing delay of a typical job to zero, as N increases. We propose a certain policy and establish (using a fluid limit approach) that it drives the delay to zero when either (i) the message rate grows superlinearly with N, or (ii) the memory grows superlogarithmically with N. Moreover, we show that any policy that has a certain symmetry property, and for which neither condition (i) or (ii) holds, results in an expected queueing delay which is bounded away from zero. Finally, using the fluid limit approach once more, we show that for any given α > 0 (no matter how small), if the policy only uses a linear message rate aN, the resulting asymptotic (as N → ∞) expected queueing delay is positive but upper bounded, uniformly over all λ > 1. This is a significant improvement over the popular "power-of-d-choices" policy, which has a limiting expected delay that grows as log (1/(1 - λ)) when λ ↑ 1.

Original language | English (US) |
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Title of host publication | SIGMETRICS/ Performance 2016 - Proceedings of the SIGMETRICS/Performance Joint International Conference on Measurement and Modeling of Computer Science |

Publisher | Association for Computing Machinery, Inc |

Pages | 1-12 |

Number of pages | 12 |

ISBN (Electronic) | 9781450342667 |

DOIs | |

State | Published - Jun 14 2016 |

Externally published | Yes |

Event | 13th Joint International Conference on Measurement and Modeling of Computer Systems, ACM SIGMETRICS / IFIP Performance 2016 - Antibes Juan-les-Pins, France Duration: Jun 14 2016 → Jun 18 2016 |

### Publication series

Name | SIGMETRICS/ Performance 2016 - Proceedings of the SIGMETRICS/Performance Joint International Conference on Measurement and Modeling of Computer Science |
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### Conference

Conference | 13th Joint International Conference on Measurement and Modeling of Computer Systems, ACM SIGMETRICS / IFIP Performance 2016 |
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Country/Territory | France |

City | Antibes Juan-les-Pins |

Period | 6/14/16 → 6/18/16 |

### Bibliographical note

Publisher Copyright:© 2016 Copyright held by the owner/author(s). Publication rights licensed to ACM.

## Keywords

- Dispatching policies
- Distributed service
- Performance tradeoffs