Supporting dynamic parallel object arrays

Orion S. Lawlor, Laxmikant V. Kalé

Research output: Contribution to journalArticlepeer-review


We present efficient support for generalized arrays of parallel data driven objects. Array elements are regular C++ objects, and are scattered across the parallel machine. An individual element is addressed by its 'index', which can be an arbitrary object rather than a simple integer. For example, an array index can be a series of numbers, supporting multidimensional sparse arrays; a bit vector, supporting collections of quadtree nodes; or a string. Methods can be invoked on any individual array element from any processor, and the elements can participate in reductions and broadcasts. Individual elements can be created or deleted dynamically at any time. Most importantly, the elements can migrate from processor to processor at any time. We discuss support for message delivery and collective operations in the face of such dynamic behavior. The migration capabilities of array elements have proven extremely useful, for example, in implementing flexible load balancing strategies and for exploiting workstation clusters adaptively. We present the design, an implementation, and performance results.

Original languageEnglish (US)
Pages (from-to)371-393
Number of pages23
JournalConcurrency Computation Practice and Experience
Issue number3-5 SPEC.
StatePublished - 2003


  • Object migration
  • Parallel hashtable
  • Parallel runtime

ASJC Scopus subject areas

  • Software
  • Theoretical Computer Science
  • Computer Science Applications
  • Computer Networks and Communications
  • Computational Theory and Mathematics

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