A mini-app for neutral-particle, discrete-ordinates (SN), transport on parallel-decomposed meshes of tetrahedra.
Tycho2 was originally written by Kris Garrett while a postdoc at Los Alamos National Laboratory (see the license) in the CCS-2 group, working together with Jim Warsa and Jae Chang, members of the Capsaicin deterministic SN transport code project at LANL. The goal of the mini-app is to provide a simple platform to explore the strange new world of GPUs and heterogeneous computer architectures. The idea being that, like the SNAP, UMT, and Kripke mini-apps for structured meshes*, potential approaches and implementations for unstructured mesh transport could be investigated and perhaps transferred to the more complicated Capsaicin project if they showed promise. Makes sense, right? Anyway, Kris has left LANL and now it's up to Jim Warsa and any other contributors to take up where he left off. Recent work by Dan Ibanez of Sandia National Laboratory, with Kris, on using Kokkos in Tycho2 is gratefully acknowledged.
Tycho2 is based on a code called Tycho, written by Shawn Pautz (Sandia National Laboratory) sometime around the year 2000, when he was at Los Alamos National Laboratory. Alhough Tycho wasn't a mini-app (that term hadn't been invented yet), Shawn was using Tycho to explore ideas for parallel, unstructrued mesh, SN sweeps. Remember, those were early days. Although we didn't borrow any code base from the original implementation, we named our mini-app Tycho2 in an homage to Shawn's original code (and because Tycho2 works only on tets, like Tycho).
*Note that, to the best of our knowledge, while UMT is targeted to unstructred meshes, the meshes are actually logially orthgonal, without the additional complications and computational overhead associated with SN sweeps on meshes with arbitrary orientations and connectivtiies.
This is still being heavily developed, so ... USE AT YOUR OWN RISK!!!
Copyright (c) 2016, Los Alamos National Security, LLC
All rights reserved.
Copyright 2016. Los Alamos National Security, LLC. This software was produced under U.S. Government contract DE-AC52-06NA25396 for Los Alamos National Laboratory (LANL), which is operated by Los Alamos National Security, LLC for the U.S. Department of Energy. The U.S. Government has rights to use, reproduce, and distribute this software. NEITHER THE GOVERNMENT NOR LOS ALAMOS NATIONAL SECURITY, LLC MAKES ANY WARRANTY, EXPRESS OR IMPLIED, OR ASSUMES ANY LIABILITY FOR THE USE OF THIS SOFTWARE. If software is modified to produce derivative works, such modified software should be clearly marked, so as not to confuse it with the version available from LANL.
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Build notes can be found at the following wiki page: https://github.com/losalamos/tycho2/wiki/Build-Notes
LA-CC-16-049
- Kris Garrett (LANL [formerly], original author)
- Neelam Patel (Affiliation unknown)
- Kevin Procopio (ORNL, contributor)
- Jim Warsa (LANL, ideas, criticisms, advisement)
- David Dixon (LANL, contributor)
- Dan Ibanez (SNL, contributor, Kokkos expert)
- Jae Chang (LANL, honorable team leader)
- Jeff Haack (LANL, contributor)