Antonio Ragagnin photo

Antonio Ragagnin1,2

1Dipartimento di Fisica e Astronomia "Augusto Righi", Alma Mater Studiorum Università di Bologna, via Gobetti 93/2, I-40129 Bologna, Italy
2INAF - Osservatorio Astronomico, via Tiepolo 11, 34131 Trieste, Italy
antonio.ragagnin@unibo.it

I am an astrophysicist working as a postdoc on numerical simulations of galaxy clusters at the Physics and Astrophysics departement of the University of Bologna (DIFA). My main interests are: formation and evolution of haloes thorugh the study of their concentration and satellite properties, and High Performance Computing (HPC) re-engineering of gravity and hydrodynamic N-body solvers in order to run the next generation of high-resolution hydrodynamic simulations on cosmological volumes.

Resources

Curriculum Vitae updated at October 2020

SAO/NASA ADS Complete list of pubblications

My ORCiD 0000-0002-8106-2742

C2PAP Web Portal: a web portal for inspecting and post processing Magneticum simulations

c2pap_batch.py: send batch of jobs to the c2pap cosmo sim from command line

print_affinity.c: helps affinity set ups in HPC systems by printing hostname and CPU index for each MPI and OpenMP thread

g3read: repository of various python libraries to read and post process Gadget2/3 and HDF5 outputs

hydro_mc: a webapp to obtain sparsity and concentration paramters of haloes as in Ragagnin et al. (2020) (see also the respective python library github.com/aragagnin/hydro_mc)

HODEmu: a work in progress Halo Occupation Distribution (HOD) Emulator based on Magneticum simulations.

In the press

A unique data center for cosmological simulations (Science Daily, 2017)

Il futuro delle galassie in scatola (Media INAF, 2015)

Selected list of publications

Satellite galaxy abundance dependency on cosmology in Magneticum simulations (2021)
Ragagnin A., Fumagalli A., Castro T., Dolag K., Saro A., Costanzi M., Bocquet S.

Cosmology dependence of halo masses and concentrations in hydrodynamic simulations (2021)
Ragagnin A., Saro A., Singh P., Dolag K.

Gadget3 on GPUs with OpenACC (2020)
Ragagnin A., Dolag K., Wagner M., Gheller C., Roffler C., Goz D., Hubber D., Arth A.

Dependency of halo concentration on mass, redshift and fossilness in Magneticum hydrodynamic simulations (2019)
Ragagnin A., Dolag K., Moscardini L., Biviano A., D'Onofrio M.

From the mass-concentration relation of haloes to GPUs and into the web: a guide on fully utilizing super computers for the largest, cosmological hydrodynamic simulations. (PhD thesis, 2018)
Ragagnin A.

A web portal for hydrodynamical, cosmological simulations (2017)
Ragagnin A., Dolag K., Biffi V., Cadolle Bel M., Hammer N. J., Krukau A., Petkova M., Steinborn D.

Exploiting the Space Filling Curve Ordering of Particles in the Neighbour Search of Gadget3 (2016)
Ragagnin A., Tchipev N., Bader M., Dolag K., Hammer N. J.

Talks, posters and workshops

CSC and NVIDIA virtual hackaton (2020) with code Gadget3 (link)

OpenACC Summit (virtual, 2020) invited talk "Bringing Zoom-In Initial Conditions of Cosmological Simulations on GPUs "

ParCo (Prague, 2019) presenting paper "Gadget3 on GPUs with OpenACC"

GPU Technology Conference (GTC, Munich, 2018) invited poster "Gadget3 (N-Body gravity + SPH) on GPUs"

EnviroInfo (Munich, 2018) invited poster "A web portal for large cosmological simulation data visualization and post processing"

EuroHack (Lugano, 2017) workshop on OpenACC at CSCS

Perspectives of GPU in science (Rome, 2016) poster "A multi node Barnes Hut solver on GPUs for Gadget3"

HydroSim (Trieste, 2016) workshop on hydrodynamic simulations

Astronomical Data Analysis Software and Systems (ADASS, Trieste, 2016) talk "A web interface to federalize the outcome of large, cosmological, hydrodynamic simulations"

EuroHack (Lugano, 2015) workshop on OpenACC at CSCS

International Conference on Parallel Computing (ParCo, Edinburgh, 2015) talk "Exploiting the Space Filling Curve Ordering of Particles in the Neighbour Search of Gadget3"

Computational Solar and Astrophysical Modeling (Jülich, 2015) workshop