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Adaptive Massively Parallel Constant-Round Tree Contraction

Authors MohammadTaghi Hajiaghayi, Marina Knittel, Hamed Saleh, Hsin-Hao Su

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Author Details

MohammadTaghi Hajiaghayi
  • University of Maryland, College Park, MD, USA
Marina Knittel
  • University of Maryland, College Park, MD, USA
Hamed Saleh
  • University of Maryland, College Park, MD, USA
Hsin-Hao Su
  • Boston College, MA, USA

Funding

  • Hajiaghayi, MohammadTaghi: Supported by the NSF BIGDATA Grant No. 1546108, NSF SPX Grant No. 1822738, and NSF AF Grant No. 2114269.
  • Knittel, Marina: Supported by the NSF BIGDATA Grant No. 1546108, NSF SPX Grant No. 1822738, ARCS Endowment Award, and Ann G. Wylie Fellowship.
  • Su, Hsin-Hao: Supported by NSF Grant No. CCF-2008422.

Cite As Get BibTex

MohammadTaghi Hajiaghayi, Marina Knittel, Hamed Saleh, and Hsin-Hao Su. Adaptive Massively Parallel Constant-Round Tree Contraction. In 13th Innovations in Theoretical Computer Science Conference (ITCS 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 215, pp. 83:1-83:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022) https://doi.org/10.4230/LIPIcs.ITCS.2022.83

Abstract

Miller and Reif’s FOCS'85 [Gary L. Miller and John H. Reif, 1989] classic and fundamental tree contraction algorithm is a broadly applicable technique for the parallel solution of a large number of tree problems. Additionally it is also used as an algorithmic design technique for a large number of parallel graph algorithms. In all previously explored models of computation, however, tree contractions have only been achieved in Ω(log n) rounds of parallel run time. In this work, we not only introduce a generalized tree contraction method but also show it can be computed highly efficiently in O(1/ε³) rounds in the Adaptive Massively Parallel Computing (AMPC) setting, where each machine has O(n^ε) local memory for some 0 < ε < 1. AMPC is a practical extension of Massively Parallel Computing (MPC) which utilizes distributed hash tables [MohammadHossein Bateni et al., 2017; Behnezhad et al., 2019; Raimondas Kiveris et al., 2014]. In general, MPC is an abstract model for MapReduce, Hadoop, Spark, and Flume which are currently widely used across industry and has been studied extensively in the theory community in recent years. Last but not least, we show that our results extend to multiple problems on trees, including but not limited to maximum and maximal matching, maximum and maximal independent set, tree isomorphism testing, and more.

Subject Classification

ACM Subject Classification
  • Theory of computation → Massively parallel algorithms
Keywords
  • Adaptive Massively Parallel Computation
  • Tree Contraction
  • Matching
  • Independent Set
  • Tree Isomorphism

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