Multi-GPU parallelization of the NAS multi-zone parallel benchmarks
Autor: | Marc Gonzalez, Enric Morancho |
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Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Arquitectura de Computadors, Universitat Politècnica de Catalunya. CAP - Grup de Computació d'Altes Prestacions |
Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Computer science
Dynamic Parallel programming (Computer science) Workload Dynamic priority scheduling Parallel computing Load balancing (computing) Programació en paral·lel (Informàtica) Unitats de processament gràfic Guided schedulings Load management Computational Theory and Mathematics Multi-GPU parallelization Hardware and Architecture Signal Processing Multi gpu Informàtica::Arquitectura de computadors::Arquitectures paral·leles [Àrees temàtiques de la UPC] Graphics processing units Load balancing Static |
Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
Popis: | GPU-based computing systems have become a widely accepted solution for the high-performance-computing (HPC) domain. GPUs have shown highly competitive performance-per-watt ratios and can exploit an astonishing level of parallelism. However, exploiting the peak performance of such devices is a challenge, mainly due to the combination of two essential aspects of multi-GPU execution. On one hand, the workload should be distributed evenly among the GPUs. On the other hand, communications between GPU devices are costly and should be minimized. Therefore, a trade-of between work-distribution schemes and communication overheads will condition the overall performance of parallel applications run on multi-GPU systems. In this article we present a multi-GPU implementation of NAS Multi-Zone Parallel Benchmarks (which execution alternate communication and computational phases). We propose several work-distribution strategies that try to evenly distribute the workload among the GPUs. Our evaluations show that performance is highly sensitive to this distribution strategy, as the the communication phases of the applications are heavily affected by the work-distribution schemes applied in computational phases. In particular, we consider Static, Dynamic, and Guided schedulers to find a trade-off between both phases to maximize the overall performance. In addition, we compare those schedulers with an optimal scheduler computed offline using IBM CPLEX. On an evaluation environment composed of 2 x IBM Power9 8335-GTH and 4 x GPU NVIDIA V100 (Volta), our multi-GPU parallelization outperforms single-GPU execution from 1.48x to 1.86x (2 GPUs) and from 1.75x to 3.54x (4 GPUs). This article analyses these improvements in terms of the relationship between the computational and communication phases of the applications as the number of GPUs is increased. We prove that Guided schedulers perform at similar level as optimal schedulers. This work was supported by the Spanish Ministry of Science and Technology (TIN2015-65316-P) and by the Generalitat de Catalunya (2014-SGR-1051). |
Databáze: | OpenAIRE |
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