Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: MHD Code Using Multi Graphical Processing Units: SMAUG+   This paper introduces the Sheffield Magnetohydrodynamics Algorithm Using GPUs
(SMAUG+), an advanced numerical code for solving magnetohydrodynamic (MHD)
problems, using multi-GPU systems. Multi-GPU systems facilitate the development
of accelerated codes and enable us to investigate larger model sizes and/or
more detailed computational domain resolutions. This is a significant
advancement over the parent single-GPU MHD code, SMAUG (Griffiths, M., Fedun,
V., and Erd\'elyi, R. (2015). A fast MHD code for gravitationally stratified
media using graphical processing units: SMAUG. Journal of Astrophysics and
Astronomy,36(1):197-223). Here, we demonstrate the validity of the SMAUG+ code,
describe the parallelisation techniques and investigate performance benchmarks.
The initial configuration of the Orszag-Tang vortex simulations are distributed
among 4, 16, 64 and 100 GPUs. Furthermore, different simulation box resolutions
are applied: $1000 \times 1000$, $2044 \times 2044$, $4000 \times 4000$ and
$8000 \times 8000$. We also tested the code with the Brio-Wu shock tube
simulations with model size of 800 employing up to 10 GPUs. Based on the test
results, we observed speed ups and slow downs, depending on the granularity and
the communication overhead of certain parallel tasks. The main aim of the code
development is to provide massively parallel code without the memory limitation
of a single GPU. By using our code, the applied model size could be
significantly increased. We demonstrate that we are able to successfully
compute numerically valid and large 2D MHD problems.

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The categories of this paper are: q-alg
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th