Invited Talk: Addressing Practical HPC Problems: Fault Tolerance, Performance Portability, Parallelism Compilation – Dr Giorgis Georgakoudis

Dr Giorgis Georgakoudis, Lawrence Livermore National Laboratory
18 February 2021

Abstract:

This talk will present an overview of research on different areas of open problems in HPC. On fault tolerance, Giorgis will present the Reinit solution for fault tolerance in large scale MPI applications. Reinit improves the recovery time of checkpointed MPI applications by avoiding MPI re-deployment on restart, extending instead the MPI runtime to repair itself at runtime. On performance portability, Giorgis will present the auto-tuning framework Apollo, which provides an API for tuning execution parameters of code regions using machine learning at runtime. Lastly, Giorgis will talk on understanding deficiencies of parallelism compilation and of the approach to move forward for improving compiler optimizations for parallel programs.

Bio:

Giorgis Georgakoudis is a Computer Scientist in the Center for Applied Scientific Computing at Lawrence Livermore National Laboratory. His research interests include fault tolerance, optimized compilation of parallel programs, and runtime performance characterization and tuning. He is currently involved in the Exascale Computing Project, designing and developing fault-tolerance abstractions for MPI, and in the Apollo project for dynamic tuning the performance of parallel programs. Also, since October 2020, Giorgis leads his own project on compiler optimizations for parallelism as the Principal Investigator, funded through the Lab Directed Research and Development (LDRD) Program of LLNL.

Giorgis obtained his Dipl. Eng. (2007), Master’s (2010), and PhD degrees (2017) from the Department of Electrical and Computer Eng. of University of Thessaly, Greece. From 2013 to 2018, he was also affiliated with Queen’s University Belfast, UK working as a researcher concurrently with his PhD studies. Since November 2018 Giorgis is working in the Center for Applied Scientific Computing at Lawrence Livermore National Laboratory. He is also a member of ACM and IEEE societies, and frequently provides professional service as a reviewer in conferences and journals.

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