TOP Events & Outreach R-CCS Cafe The 185th R-CCS Cafe - part 1
The 185th R-CCS Cafe - part 1
Title
Parallel Multigrid Methods on Manycore Clusters with IHK/McKernel
Date | Mon, Dec 2, 2019 |
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Time | 1 pm - 1:40 pm |
City | Kobe, Japan |
Place | Lecture Hall (6th floor) at R-CCS |
Language | Presentation Language: English Presentation Material: English |
Speakers |
Abstract
The parallel multigrid method is expected to play an important role in large-scale scientific computing on exa-scale supercomputer systems. Previously we proposed Hierarchical Coarse Grid Aggregation (hCGA), which dramatically improved the performance of the parallel multigrid solver when the number of MPI processes was O(10^4) or more. Because hCGA can handle only two layers of parallel hierarchical levels, the computation overhead due to coarse grid solver may become significant when the number of MPI processes reaches O(10^5)- O(10^6) or more. In the present work, we propose AM-hCGA (Adaptive Multilevel hCGA) that can take into account multiple layers of three or more levels, and show preliminary results using the Oakforest-PACS (OFP) system by JCAHPC. Additionally, we also examine the impact of a lightweight multi-kernel operating system, called IHK/McKernel, for parallel multigrid solvers running on OFP.
This is a joint work with Balazs Gerofi (RIKEN R-CCS), Yutaka Ishikawa (RIKEN R-CCS), and Masashi Horikoshi (Intel).
(Nov 27, 2019)