Optimization strategies for the acoustic wave stencil on multicore systems

• Grant number: 22/11070-9
• Support Opportunities: Scholarships abroad - Research Internship - Scientific Initiation
• Start date: November 01, 2022
• End date: February 28, 2023
• Field of knowledge: Physical Sciences and Mathematics - Computer Science - Computer Systems
• Principal Investigator: Hermes Senger
• Grantee: Letícia Suellen Farias Machado
• Supervisor: Claude Martin Tadonki
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Institution abroad: ParisTech, France
• Associated to the scholarship: 22/00434-0 - Parallelism strategies for finite difference acoustic wave simulation operators on GPUs, BP.IC

Abstract

Seismic imaging techniques are extensively used in geophysical exploration. For example, the full-waveform inversion (FWI) and the reverse time migration (RTM) are essential applications for the identification and placement of hydrocarbon reservoirs and the characterization of the subsurface material like porosity, viscosity, acoustic velocity, localization, dimensions, and others. Such applications typically rely on finite differences methods and stencil computation kernels to solve the physics of interest, which demand supercomputing capacity. The Top500 (as of June 2022) includes five Brazilian supercomputers. Three out of these five belong to the same oil and gas company and are dedicated to seismic applications. A major performance issue with stencils is their bad data locality, which leads to memory inefficiency. This BEPE project aims to study code transformations and optimization for improving the efficiency of stencil codes that simulate the propagation of the acoustic wave across NUMA architecture. (AU)