A Decentralized Parallelization-in-Time Approach with Parareal
Abstract
With steadily increasing parallelism for high-performance architectures, simulations requiring a good strong scalability are prone to be limited in scalability with standard spatial-decomposition strategies at a certain amount of parallel processors. This can be a show-stopper if the simulation results have to be computed with wallclock time restrictions (e.g.\,for weather forecasts) or as fast as possible (e.g. for urgent computing). Here, the time-dimension is the only one left for parallelization and we focus on Parareal as one particular parallelization-in-time method. We discuss a software approach for making Parareal parallelization transparent for application developers, hence allowing fast prototyping for Parareal. Further, we introduce a decentralized Parareal which results in autonomous simulation instances which only require communicating with the previous and next simulation instances, hence with strong locality for communication. This concept is evaluated by a prototypical solver for the rotational shallow-water equations which we use as a representative black-box solver.
Cite
@article{arxiv.1506.05157,
title = {A Decentralized Parallelization-in-Time Approach with Parareal},
author = {Martin Schreiber and Adam Peddle and Terry Haut and Beth Wingate},
journal= {arXiv preprint arXiv:1506.05157},
year = {2016}
}