On stalling in LogP

(Extended Abstract)
  • Gianfranco Bilardi
  • Kieran T. Herley
  • Andrea Pietracaprina
  • Geppino Pucci
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1800)


We investigate the issue of stalling in the LogP model. In particular, we introduce a novel quantitative characterization of stalling, referred to as δ-stalling, which intuitively captures the realistic assumption that once the network’s capacity constraint is violated, it takes some time (at most δ) for this information to propagate to the processors involved. We prove a lower bound that shows that LogP under δ-stalling is strictly more powerful than the stall-free version of the model where only strictly stall-free computations are permitted. On the other hand, we show that δ-stalling LogP with δ = L can be simulated with at most logarithmic slowdown by a BSP machine with similar bandwidth and latency values, thus extending the equivalence (up to logarithmic factors) between stall-free LogP and BSP argued in [1] to the more powerful L-stalling LogP.


Capacity Constraint Local Memory Incoming Message Barrier Synchronization Maximum Delivery Time 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Gianfranco Bilardi
    • 1
    • 2
  • Kieran T. Herley
    • 3
  • Andrea Pietracaprina
    • 1
  • Geppino Pucci
    • 1
  1. 1.Dipartimento di Elettronica e InformaticaUniversità di PadovaPadovaItaly
  2. 2.T.J. Watson Research CenterIBMYorktown HeightsUSA
  3. 3.Department of Computer ScienceUniversity College CorkCorkIreland

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