On reducing the complexity of matrix clocks

  • Authors:
  • Lúcia M. A. Drummond;Valmir C. Barbosa

  • Affiliations:
  • Universidade Federal Fluminense, Instituto de Computaçao, Rua Passo da Pátria, 156, 24210-240 Niterói - RJ, Brazil;Universidade Federal do Rio de Janeiro, Programa de Engenharia de Sistemas e Computação, COPPE, Caixa Postal 68511, 21941-972 Rio de Janeiro - RJ, Brazil

  • Venue:
  • Parallel Computing
  • Year:
  • 2003

Quantified Score

Hi-index 0.00

Visualization

Abstract

Matrix clocks are a generalization of the notion of vector clocks that allows the local representation of causal precedence to reach into an asynchronous distributed computation's past with depth x, where x ≥ 1 is an integer. Maintaining matrix clocks correctly in a system of n nodes requires that every message be accompanied by O(nx) numbers, which reflects an exponential dependency of the complexity of matrix clocks upon the desired depth x. We introduce a novel type of matrix clock, one that requires only nx numbers to be attached to each message while maintaining what for many applications may be the most significant portion of the information that the original matrix clock carries. In order to illustrate the new clock's applicability, we demonstrate its use in the monitoring of certain resource-sharing computations.