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LANS Informal Seminar: Michel Schanen
November 4, 2015 @ 15:00 CST
Seminar Title: Asynchronous Two-Level Checkpointing Scheme for Large-Scale Adjoints using Nek5000
Speaker: Michel Schanen, Postdoctoral Appointee, MCS, Argonne National Laboratory
Date/Time: 2015-11-04 15:00
Location: Bldg 240 rm 4301
Description:
Adjoints are an important computational tool for large-scale sensitivity evaluation, uncertainty quantification, and derivative-based optimization. Essential to their performance is an efficient checkpointing scheme recovering the primal values in the adjoint run, this being a trade-off between memory requirement and recomputation. An asynchronous two-level adjoint checkpointing scheme has been implemented for multistep numerical time discretizations targeted at large-scale numerical simulations. The checkpointing scheme combines both bandwidth-limited disk checkpointing and binomial memory checkpointing. Based on assumptions about the target petascale system, 50k+ cores on the IBM Blue Gene/Q system Mira, this checkpointing approach and the performance model has been validated using the spectral element solver Nek5000.