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Lattice QCD Thermodynamics on the Grid
We describe how we have used simultaneously ${\cal O}(10^3)$ nodes of the EGEE Grid, accumulating ca. 300 CPU-years in 2-3 months, to determine an important property of Quantum Chromodynamics. We explain how Grid resources were exploited efficiently and with ease, using user-level overlay based on G...
Autores principales: | , , , , |
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Lenguaje: | eng |
Publicado: |
2009
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/j.cpc.2010.06.027 http://cds.cern.ch/record/1226190 |
_version_ | 1780918408146059264 |
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author | Mościcki, Jakub T Woś, Maciej Lamanna, Massimo de Forcrand, Philippe Philipsen, Owe |
author_facet | Mościcki, Jakub T Woś, Maciej Lamanna, Massimo de Forcrand, Philippe Philipsen, Owe |
author_sort | Mościcki, Jakub T |
collection | CERN |
description | We describe how we have used simultaneously ${\cal O}(10^3)$ nodes of the EGEE Grid, accumulating ca. 300 CPU-years in 2-3 months, to determine an important property of Quantum Chromodynamics. We explain how Grid resources were exploited efficiently and with ease, using user-level overlay based on Ganga and DIANE tools above standard Grid software stack. Application-specific scheduling and resource selection based on simple but powerful heuristics allowed to improve efficiency of the processing to obtain desired scientific results by a specified deadline. This is also a demonstration of combined use of supercomputers, to calculate the initial state of the QCD system, and Grids, to perform the subsequent massively distributed simulations. The QCD simulation was performed on a $16^3\times 4$ lattice. Keeping the strange quark mass at its physical value, we reduced the masses of the up and down quarks until, under an increase of temperature, the system underwent a second-order phase transition to a quark-gluon plasma. Then we measured the response of this system to an increase in the quark density. We find that the transition is smoothened rather than sharpened. If confirmed on a finer lattice, this finding makes it unlikely for ongoing experimental searches to find a QCD critical point at small chemical potential. |
id | cern-1226190 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2009 |
record_format | invenio |
spelling | cern-12261902019-09-30T06:29:59Zdoi:10.1016/j.cpc.2010.06.027http://cds.cern.ch/record/1226190engMościcki, Jakub TWoś, MaciejLamanna, Massimode Forcrand, PhilippePhilipsen, OweLattice QCD Thermodynamics on the GridComputing and ComputersWe describe how we have used simultaneously ${\cal O}(10^3)$ nodes of the EGEE Grid, accumulating ca. 300 CPU-years in 2-3 months, to determine an important property of Quantum Chromodynamics. We explain how Grid resources were exploited efficiently and with ease, using user-level overlay based on Ganga and DIANE tools above standard Grid software stack. Application-specific scheduling and resource selection based on simple but powerful heuristics allowed to improve efficiency of the processing to obtain desired scientific results by a specified deadline. This is also a demonstration of combined use of supercomputers, to calculate the initial state of the QCD system, and Grids, to perform the subsequent massively distributed simulations. The QCD simulation was performed on a $16^3\times 4$ lattice. Keeping the strange quark mass at its physical value, we reduced the masses of the up and down quarks until, under an increase of temperature, the system underwent a second-order phase transition to a quark-gluon plasma. Then we measured the response of this system to an increase in the quark density. We find that the transition is smoothened rather than sharpened. If confirmed on a finer lattice, this finding makes it unlikely for ongoing experimental searches to find a QCD critical point at small chemical potential.arXiv:0911.5682CERN-PH-TH-2009-110oai:cds.cern.ch:12261902009-12-01 |
spellingShingle | Computing and Computers Mościcki, Jakub T Woś, Maciej Lamanna, Massimo de Forcrand, Philippe Philipsen, Owe Lattice QCD Thermodynamics on the Grid |
title | Lattice QCD Thermodynamics on the Grid |
title_full | Lattice QCD Thermodynamics on the Grid |
title_fullStr | Lattice QCD Thermodynamics on the Grid |
title_full_unstemmed | Lattice QCD Thermodynamics on the Grid |
title_short | Lattice QCD Thermodynamics on the Grid |
title_sort | lattice qcd thermodynamics on the grid |
topic | Computing and Computers |
url | https://dx.doi.org/10.1016/j.cpc.2010.06.027 http://cds.cern.ch/record/1226190 |
work_keys_str_mv | AT moscickijakubt latticeqcdthermodynamicsonthegrid AT wosmaciej latticeqcdthermodynamicsonthegrid AT lamannamassimo latticeqcdthermodynamicsonthegrid AT deforcrandphilippe latticeqcdthermodynamicsonthegrid AT philipsenowe latticeqcdthermodynamicsonthegrid |