Lucas Nesi (Polaris & GPPD)

Dear all,

I am happy to inform you that Lucas Nesi will be visiting our research center in two weeks, and that he has accepted our invitation to present his work in a team seminar.

Lucas is doing his PhD in a collaboration between the Univ. Grenoble Alpes (w/ Arnaud Legrand) & the Federal University of Rio Grande do Sul (w/ Lucas Schnorr).

You can join us on October 6 (Thursday) at 2 pm in room George Boole 2 or online.

Speaker

Lucas Nesi (Polaris & GPPD)

When

Thursday, October 6, 2022 at 2 pm.

Where

room George Boole 2 or online (Zoom link below)

Title

Exploiting system-level heterogeneity to improve the performance of multi-phase task-based applications

Abstract

HPC infrastructures often present intra-node (multi-core CPUs and multiple GPUs) and system-level heterogeneity (different nodes arranged into partitions). This heterogeneity provides opportunities for the applications to improve performance, especially in task-based multi-phase applications where each phase has different needs. Improving phases overlap and asynchronously, taking advantage of inter-node heterogeneity to better distribute the load, and adequately selecting the number of resources to use are examples of such opportunities. In this talk, we present strategies for (1) improving applications phase overlap by optimizing runtime and scheduling decisions; (2) computing a distribution considering phases' suitability over heterogeneous nodes while reducing the redistribution overhead; (3) strategies based on the Gaussian Process for the application to dynamically learn during execution time and adapt to the best set of heterogeneous nodes it has access.