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From piz daint to the stars

Gregor Daiß, Dirk Pfüger, Parsa Amini, John Biddiscombe, Patrick Diehl, Juhan Frank, Kevin Huck, Hartmut Kaiser, Dominic Marcello, David Pfander
2019 Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis on - SC '19  
We study the simulation of stellar mergers, which requires complex simulations with high computational demands.  ...  To face the challenge of increasingly complex, diverse, and heterogeneous HPC systems, Octo-Tiger relies on high-level programming abstractions.  ...  ACKNOWLEDGMENTS We thank the Swiss National Supercomputing Centre and the National Energy Research Scientific Computing Center for providing is with the node hours to run the simulations and the Center  ... 
doi:10.1145/3295500.3356221 dblp:conf/sc/DaissABDFHKMPP19 fatcat:wk2folknurevnf7vklqkg4mjyy

Performance Measurements within Asynchronous Task-based Runtime Systems: A Double White Dwarf Merger as an Application [article]

Patrick Diehl and Dominic Marcello and Parsa Armini and Hartmut Kaiser and Sagiv Shiber and Geoffrey C. Clayton and Juhan Frank and Gregor Daiß and Dirk Pflüger and David Eder and Alice Koniges and Kevin Huck
2021 arXiv   pre-print
The measurements' overheads are small, enabling the combined use of performance data and physical properties with the goal of improving the code's performance.  ...  We perform a convergence study for four different levels of refinement and analyze the application's performance with respect to adaptive grid refinement.  ...  Supplementary materials Build scripts 1 ; input files 2 and software version; and slurm files 3 are available to reproduce the results.  ... 
arXiv:2102.00223v2 fatcat:se34sswsebaafkphpeticvfwny

On the dynamics of supermassive black holes in gas-rich, star-forming galaxies: the case for nuclear star cluster co-evolution

Pawel Biernacki, Romain Teyssier, Andreas Bleuler
2017 Monthly notices of the Royal Astronomical Society  
This new model is tested against a suite of high-resolution simulations of an isolated, gas-rich, cooling halo.  ...  To overcome this issue, we propose an observationally motivated model for the joint evolution of the SMBH and a parent nuclear star cluster (NSC), which allows the SMBH to remain in the nuclear region,  ...  Simulations performed for this work were executed on zBox4 at University of Zurich and on Piz Dora and Piz Daint at Swiss Supercomputing Center CSCS in Lugano.  ... 
doi:10.1093/mnras/stx845 fatcat:x6ua726qcjcgtoksn7nlaxc2l4

External versus internal triggers of bar formation in cosmological zoom-in simulations

Tommaso Zana, Massimo Dotti, Pedro R. Capelo, Silvia Bonoli, Francesco Haardt, Lucio Mayer, Daniele Spinoso
2017 Monthly notices of the Royal Astronomical Society  
The emergence of a large-scale stellar bar is one of the most striking features in disc galaxies.  ...  We find that the main effect of a late minor merger and of a close fly-by is to delay the time of bar formation and those two dynamical events are not directly responsible for the development of the bar  ...  Quinn for his help and useful discussions. We acknowledge the CINECA award under the ISCRA initiative, for the availability of high-performance computing resources and support.  ... 
doi:10.1093/mnras/stx2503 fatcat:zxkzw35o6bhsnnuaqg7p3twvau

Free-floating molecular clumps and gas mixing: hydrodynamic aftermaths of the intracluster–interstellar medium interaction

Rafael Ruggiero, Romain Teyssier, Gastao B Lima Neto, Valentin Perret
2018 Monthly notices of the Royal Astronomical Society  
In this work, we use an idealised, high-resolution simulation of a Virgo-like cluster, run with RAMSES and with dynamics reproducing that of a zoom cosmological simulation, to investigate the interaction  ...  Surprisingly, we also find in our simulation that the ICM gas significantly changes the composition of the gaseous disks of the galaxies: after crossing the cluster once, typically 20 disks comes from  ...  The simulations presented here were run at the Swiss National Supercomputing Center (CSCS), specifically using the Piz Daint supercomputer.  ... 
doi:10.1093/mnras/sty2010 fatcat:ig4mjapw4fdyjnbqm55yscrqr4

The effect of non-equilibrium metal cooling on the interstellar medium

Pedro R Capelo, Stefano Bovino, Alessandro Lupi, Dominik R G Schleicher, Tommaso Grassi
2018 Monthly notices of the Royal Astronomical Society  
Finally, our simulations agree quite well with observations which link star formation rate to metal emission lines.  ...  In order to assess the relevance of different physical parameters and prescriptions, we constructed a suite of ten simulations, in which we vary the chemical network (primordial and metal species), how  ...  Numerical calculations were performed on Piz Daint, at the Swiss National Supercomputing Center (CSCS). Part of the analysis was performed using the PYNBODY package (Pontzen et al. 2013  ... 
doi:10.1093/mnras/stx3355 fatcat:qp5m7vpa7fhereznocphmwfxza

An adaptive mesh, GPU-accelerated, and error minimized special relativistic hydrodynamics code [article]

Po-Hsun Tseng, Hsi-Yu Schive, Tzihong Chiueh
2020 arXiv   pre-print
The code can handle problems involving a Lorentz factor as high as 10^6 and optimally avoid the catastrophic cancellation.  ...  We apply this code to two interesting astrophysical applications: (a) an asymmetric explosion source on the relativistic blast wave and (b) the flow acceleration and limb-brightening of relativistic jets  ...  The simulations were conducted on the to ensure that the flow diameter can be resolved by 28 Piz-Daint supercomputer that provides a 12-core Intel cells.  ... 
arXiv:2012.11130v2 fatcat:5hwsiknpv5cebazqehulemqwjq

Octo-Tiger: Binary star systems with HPX on Nvidia P100 [article]

Gregor Daiß, Universität Stuttgart, Universität Stuttgart
2019
Stellar mergers between two suns are a significant field of study since they can lead to astrophysical phenomena such as type Ia supernovae.  ...  By relying on the high-level library HPX for parallelization and Vc for vectorization, Octo-Tiger combines high performance with ease of development.  ...  It can, and has been used, to simulate the exchange of mass between stars.  ... 
doi:10.18419/opus-10179 fatcat:smpzlijvura3bkxkldclkvefeq

On the dynamics of supermassive black holes in gas-rich, star-forming galaxies: the case for nuclear star cluster co-evolution

Pawel Biernacki, Romain Teyssier, Andreas Bleuler
2017
This new model is tested against a suite of high-resolution simulations of an isolated, gas-rich, cooling halo.  ...  To overcome this issue, we propose an observationally motivated model for the joint evolution of the SMBH and a parent nuclear star cluster (NSC), which allows the SMBH to remain in the nuclear region,  ...  Simulations performed for this work were executed on zBox4 at University of Zurich and on Piz Dora and Piz Daint at Swiss Supercomputing Center CSCS in Lugano.  ... 
doi:10.5167/uzh-139297 fatcat:3xqrivquwza73anwksm6xspfqq

Structure formation with suppressed small-scale perturbations

Aurel Schneider
2015 Monthly notices of the Royal Astronomical Society  
In this paper, we study structure formation in the regime of suppressed perturbations using both analytical techniques and numerical simulations.  ...  In this paper, we study structure formation in the regime of suppressed perturbations using both analytical techniques and numerical simulations.  ...  The simulations have been performed on the following computer clusters: z-box (University of Zurich), Piz Daint (Swiss National Super-Computer Centre, CSCS), and Lonestar (Texas Advanced Computer Center  ... 
doi:10.1093/mnras/stv1169 fatcat:r6vy5g5jdrcadgwzccm5qlisjm

Portuguese SKA White Book [article]

Domingos Barbosa, Sonia Antón, João Paulo Barraca, Miguel Bergano, Alexandre C. M. Correia, Dalmiro Maia, Valério A. R. M. Ribeiro
2020 arXiv   pre-print
The meeting was very successful in providing a detailed overview of the SKA status, vision and goals and describes most of the Portuguese contributions to science, technology and the related industry aspirations  ...  This initiative was held to promote the Square Kilometer Array (SKA) - the world's largest radio telescope - among the Portuguese scientific and business communities with support from the Portuguese Science  ...  We warmly thank Arnold van Ardenne for invaluable comments and for the inspirational collaboration towards the "greening" of large scale science and the enhancement of its societal impact.  ... 
arXiv:2005.01140v1 fatcat:gijmylrmvfcj3i7dt3wbsr6vhm

Towards a Mini-App for Smoothed Particle Hydrodynamics at Exascale [article]

Danilo Guerrera, Rubén M. Cabezón, Jean-Guillaume Piccinali, Aurélien Cavelan, Florina M. Ciorba, David Imbert, Lucio Mayer, Darren Reed
2018 pre-print
The smoothed particle hydrodynamics (SPH) technique is a purely Lagrangian method, used in numerical simulations of fluids in astrophysics and computational fluid dynamics, among many other fields.  ...  SPH simulations with detailed physics represent computationally-demanding calculations. The parallelization of SPH codes is not trivial due to the absence of a structured grid.  ...  Certain computation and simulation results presented here were obtained with SPH-flow, courtesy of Nextflow Software. The support of the EU Horizon 2020 POP CoE project is also acknowledged.  ... 
doi:10.1109/cluster.2018.00077 arXiv:1809.08013v1 fatcat:4lxxecch3raxpdvr6a47gbrhma