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An Empirical High Level Performance Model For Future Many-cores

Surya Narayanan Natarajan 1 Bharath Narasimha Swamy 1 André Seznec 1
1 ALF - Amdahl's Law is Forever
Inria Rennes – Bretagne Atlantique , IRISA-D3 - ARCHITECTURE
Abstract : Estimating the potential performance of parallel applications on the yet-to-be-designed future many cores is very speculative. The simple models proposed by Amdahl's law ( xed input problem size) or Gustafson's law ( xed number of cores) do not completely capture the scaling behaviour of a multi-threaded (MT) application leading to over estimation of performance in the many-core era. On the other hand, modeling many-core by simulation is too slow to study the applications performance. In this paper, we propose a more re ned but still tractable, high level empirical performance model for multi-threaded applications, the Serial/Parallel Scaling (SPS)Model to study the scalability and performance of application in many-core era. SPS model learns the application behavior on a given architecture and provides realistic estimates of the performance in future many-cores. Considering both input problem size and the number of cores in modeling, SPS model can help in making high level decisions on the design choice of future many-core applications and architecture. We validate the model on the Many-Integrated Cores (MIC) xeon-phi with 240 logical cores.
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Submitted on : Tuesday, June 30, 2015 - 6:27:12 PM
Last modification on : Thursday, January 7, 2021 - 4:34:08 PM



Surya Narayanan Natarajan, Bharath Narasimha Swamy, André Seznec. An Empirical High Level Performance Model For Future Many-cores. Proceedings of the 12th ACM International Conference on Computing Frontiers, 2015, Ischia, Italy. ⟨10.1145/2742854.2742867⟩. ⟨hal-01170038⟩



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