Co-scheduling HPC workloads on cache-partitioned CMP platforms

Guillaume Aupy 1 Anne Benoit 2, 3 Brice Goglin 1 Loïc Pottier 2 Yves Robert 4, 2
1 TADAAM - Topology-Aware System-Scale Data Management for High-Performance Computing
LaBRI - Laboratoire Bordelais de Recherche en Informatique, Inria Bordeaux - Sud-Ouest
2 ROMA - Optimisation des ressources : modèles, algorithmes et ordonnancement
Inria Grenoble - Rhône-Alpes, LIP - Laboratoire de l'Informatique du Parallélisme
3 Georgia Institute of Technology [Atlanta]
4 ICL - Innovative Computing Laboratory [Knoxville]
Abstract : With the recent advent of many-core architectures such as chip multiprocessors (CMP), the number of processing units accessing a global shared memory is constantly increasing. Co-scheduling techniques are used to improve application throughput on such architectures, but sharing resources often generates critical interferences. In this paper, we focus on the interferences in the last level of cache (LLC) and use the Cache Allocation Technology (CAT) recently provided by Intel to partition the LLC and give each co-scheduled application their own cache area. We consider m iterative HPC applications running concurrently and answer to the following questions: (i) how to precisely model the behavior of these applications on the cache partitioned platform? and (ii) how many cores and cache fractions should be assigned to each application to maximize the platform efficiency? Here, platform efficiency is defined as maximizing the performance either globally, or as guaranteeing a fixed ratio of iterations per second for each application. Through extensive experiments using CAT, we demonstrate the impact of cache partitioning when multiple HPC application are co-scheduled onto CMP platforms.
Keywords : HPC application Chip multiprocessor (CMP) Cache partitioning Co-scheduling
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Guillaume Aupy, Anne Benoit, Brice Goglin, Loïc Pottier, Yves Robert. Co-scheduling HPC workloads on cache-partitioned CMP platforms. International Journal of High Performance Computing Applications, SAGE Publications, 2019, 33 (6), pp.1221-1239. ⟨10.1177/1094342019846956⟩. ⟨hal-02093172⟩

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