Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancing speed and scalability of the ParFlow simulation code   Regional hydrology studies are often supported by high resolution simulations
of subsurface flow that require expensive and extensive computations. Efficient
usage of the latest high performance parallel computing systems becomes a
necessity. The simulation software ParFlow has been demonstrated to meet this
requirement and shown to have excellent solver scalability for up to 16,384
processes. In the present work we show that the code requires further
enhancements in order to fully take advantage of current petascale machines. We
identify ParFlow's way of parallelization of the computational mesh as a
central bottleneck. We propose to reorganize this subsystem using fast mesh
partition algorithms provided by the parallel adaptive mesh refinement library
p4est. We realize this in a minimally invasive manner by modifying selected
parts of the code to reinterpret the existing mesh data structures. We evaluate
the scaling performance of the modified version of ParFlow, demonstrating good
weak and strong scaling up to 458k cores of the Juqueen supercomputer, and test
an example application at large scale.

24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol