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Lattice QCD thermodynamics on the Grid
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DOI：10.1016/j.cpc.2010.06.027.png)
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摘要
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We describe how we have used simultaneously 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) x 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. (c) 2010 Elsevier B.V. All rights reserved.
Keyword:
Grid computing
Lattice QCD
QCD phase diagram
Task scheduling
Heuristic resource selection
Pilot jobs
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3.4
论文数:
1.2W
被引数:
3.7W
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