https://doi.org/10.1051/epjconf/201817502007
DD-αAMG on QPACE 3
Department of Physics, University of Regensburg, 93040 Regensburg, Germany
* Speaker, e-mail: peter.georg@ur.de
** Speaker, e-mail: daniel.richtmann@ur.de
Published online: 26 March 2018
We describe our experience porting the Regensburg implementation of the DD-αAMG solver from QPACE 2 to QPACE 3. We first review how the code was ported from the first generation Intel Xeon Phi processor (Knights Corner) to its successor (Knights Landing). We then describe the modifications in the communication library necessitated by the switch from InfiniBand to Omni-Path. Finally, we present the performance of the code on a single processor as well as the scaling on many nodes, where in both cases the speedup factor is close to the theoretical expectations.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
