Data Grid

ILDG/JLDG: Data Grids for Lattice QCD Data

As a part of the activities in CCS, we have been operating data grids, ILDG/JLDG, to share lattice QCD data among domestic and overseas researchers.
In lattice QCD, quantum chromodynamics (QCD), which is a theory of strong force acting among quarks that constitute hadrons, such as protons and neutrons, is computed by numerical simulations using supercomputers. Based on the results, we can determine fundamental parameters in physics, such as quark mass, thereby making it possible to predict new phenomena.
We have been sharing the configuration data, which are the products of lattice QCD simulations, with domestic and overseas researchers via data grids. JLDG (Japan Lattice Data Grid) is a wide-area distributed file system constructed using Gfarm filesystem developed at AIST and the University of Tsukuba, and it now connects 6 research institutes and universities, namely, U. Tsukuba, KEK, Kyoto U., Kanazawa U., Osaka U., and Hiroshima U. Users are allowed to access arbitrary files in the system without regard to the geographical locations.
JLDG has the functionality as a regional grid of ILDG (International Lattice Data Grid), which is the international data grid for sharing lattice QCD configurations on a global scale. ILDG interconnects 5 regional grids, UKQCD (UK),LDG (Germany, France, and Italy), USQCD (US), CSSM (Australia), and JLDG. Researchers in overseas researchers frequently access JLDG via ILDG.
We are planning to extend the JLDG to nuclear physics and astrophysics research areas.

Tomoteru Yoshie Associate Professor, Center for Computational Sciences, University of Tsukuba
Osamu Tatebe  Associate Professor, Center for Computational Sciences, University of Tsukuba
Toshiyuki Amagasa Associate Professor, Center for Computational Sciences, University of Tsukuba
Naoya Ukita Research Fellow, Center for Computational Sciences, University of Tsukuba
Hideo Matsufuru  Assistant Professor, Computing Research Center, High Energy Accelerator Research Organization
Ken’ichi Ishikawa  Associate Professor, Graduate School of Science, Hiroshima University
Hiroaki Togawa Assistant Professor, Research Center for Nuclear Physics, Osaka University
Shinji Takeda Assistant Professor, College of Science and Engineering, Kanazawa University
Yoshiaki Koma Lecturer, Division of Liberal Arts, Numazu National College of Technology