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Component stability in low-space massively parallel computation
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Czumaj, Artur, Davies-Peck, Peter and Parter, Merav (2024) Component stability in low-space massively parallel computation. Distributed Computing, 37 (1). pp. 35-64. doi:10.1007/s00446-024-00461-9 ISSN 0178-2770.
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Official URL: http://doi.org/10.1007/s00446-024-00461-9
Abstract
In this paper, we study the power and limitations of component-stable algorithms in the low-space model of massively parallel computation (MPC). Recently Ghaffari, Kuhn and Uitto (FOCS 2019) introduced the class of component-stable low-space MPC algorithms, which are, informally, those algorithms for which the outputs reported by the nodes in different connected components are required to be independent. This very natural notion was introduced to capture most (if not all) of the known efficient MPC algorithms to date, and it was the first general class of MPC algorithms for which one can show non-trivial conditional lower bounds. In this paper we enhance the framework of component-stable algorithms and investigate its effect on the complexity of randomized and deterministic low-space MPC. Our key contributions include: 1. We revise and formalize the lifting approach of Ghaffari, Kuhn and Uitto. This requires a very delicate amendment of the notion of component stability, which allows us to fill in gaps in the earlier arguments. 2. We also extend the framework to obtain conditional lower bounds for deterministic algorithms and fine-grained lower bounds that depend on the maximum degree
. 3. We demonstrate a collection of natural graph problems for which deterministic component-unstable algorithms break the conditional lower bound obtained for component-stable algorithms. This implies that, in the context of deterministic algorithms, component-stable algorithms are conditionally weaker than the component-unstable ones. 4. We also show that the restriction to component-stable algorithms has an impact in the randomized setting. We present a natural problem which can be solved in O(1) rounds by a component-unstable MPC algorithm, but requires
rounds for any component-stable algorithm, conditioned on the connectivity conjecture. Altogether our results imply that component-stability might limit the computational power of the low-space MPC model, at least in certain contexts, paving the way for improved upper bounds that escape the conditional lower bound setting of Ghaffari, Kuhn, and Uitto.
Item Type: | Journal Article | |||||||||||||||||||||
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Subjects: | Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software | |||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Computer Science | |||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Computational complexity, Parallel processing (Electronic computers), Parallel computers, Electronic data processing -- Distributed processing , Computer algorithms | |||||||||||||||||||||
Journal or Publication Title: | Distributed Computing | |||||||||||||||||||||
Publisher: | Springer | |||||||||||||||||||||
ISSN: | 0178-2770 | |||||||||||||||||||||
Official Date: | March 2024 | |||||||||||||||||||||
Dates: |
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Volume: | 37 | |||||||||||||||||||||
Number: | 1 | |||||||||||||||||||||
Page Range: | pp. 35-64 | |||||||||||||||||||||
DOI: | 10.1007/s00446-024-00461-9 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||
Date of first compliant deposit: | 14 March 2024 | |||||||||||||||||||||
Date of first compliant Open Access: | 15 March 2024 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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