Building the International Lattice Data Grid

Beckett, Mark G.; Coddington, P.D.; Joó, Bálint; Maynard, C.M.; Pleiter, D.; Tatebe, Osamu; Yoshié, T.

doi:10.1016/j.cpc.2011.01.027

Cited by 86 publications

(89 citation statements)

References 14 publications

(10 reference statements)

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“…We use the PACS-CS 2 + 1 flavor dynamical-fermion configurations [17] made available through the ILDG [18]. These configurations use the non-perturbatively O(a)-improved Wilson fermion action and the Iwasaki-gauge action [19].…”

Section: Simulation Techniquesmentioning

confidence: 99%

Searching for low-lying multi-particle thresholds in lattice spectroscopy

Mahbub¹,

Kamleh²,

Leinweber³

et al. 2014

Annals of Physics

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We explore the Euclidean-time tails of odd-parity nucleon correlation functions in a search for the S -wave pionnucleon scattering-state threshold contribution. The analysis is performed using 2 + 1 flavor 32 3 × 64 PACS-CS gauge configurations available via the ILDG. Correlation matrices composed with various levels of fermion source/sink smearing are used to project low-lying states. The consideration of 25,600 fermion propagators reveals the presence of more than one state in what would normally be regarded as an eigenstate-projected correlation function. This observation is in accord with the scenario where the eigenstates contain a strong mixing of single and multi-particle states but only the single particle component has a strong coupling to the interpolating field. Employing a twoexponential fit to the eigenvector-projected correlation function, we are able to confirm the presence of two eigenstates. The lower-lying eigenstate is consistent with a Nπ scattering threshold and has a relatively small coupling to the three-quark interpolating field. We discuss the impact of this small scattering-state contamination in the eigenvector projected correlation function on previous results presented in the literature.

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Section: Simulation Techniquesmentioning

confidence: 99%

Searching for low-lying multi-particle thresholds in lattice spectroscopy

Mahbub¹,

Kamleh²,

Leinweber³

et al. 2014

Annals of Physics

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“…The calculations detailed here use 2 + 1 flavour dynamical QCD configurations provided by the PACS-CS collaboration [9] through the International Lattice Data Grid [10]. These lattices have dimensions 32 3 × 64 with β = 1.9 and a physical lattice spacing of a = 0.0907(13) fm.…”

Section: Simulation Detailsmentioning

confidence: 99%

Nucleon Magnetic Properties from Lattice QCD And The Background Field Method

Bignell¹,

Leinweber²,

Kamleh³

et al. 2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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The magnetic moment and magnetic polarisability of the neutron and proton are investigated using the uniform background-field method and lattice QCD. The results are calculated using 32 3 × 64 dynamical QCD lattices provided by the PACS-CS collaboration through the ILDG. Methods of isolating the energy of the hadrons accounting for Landau level energies are explored. Effective energy shifts are formed from combinations of correlation functions and their efficiency in isolating the magnetic moment and polarisability terms is determined.

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“…The lack of HPC resources is par- ticularly acute in our field of Lattice QCD, where some of our competitors have access to dedicated lattice machines capable of hundreds of Teraflops. The ILDG program allows for the sharing of gauge field configurations within a group or with the lattice QCD community at large [1]. The PACS-CS collaboration in Japan generously released several gauge field ensembles of large volume and light quark mass suitable for cutting edge calculations to the general lattice community [2].…”

Section: Gpu Computingmentioning

confidence: 99%

GPUs: An Oasis in the Supercomputing Desert

Kamleh¹

2012

Proceedings of the 30th International Symposium on Lattice Field Theory — PoS(Lattice 2012)

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A novel metric is introduced to compare the supercomputing resources available to academic researchers on a national basis. Data from the supercomputing Top 500 and the top 500 universities in the Academic Ranking of World Universities (ARWU) are combined to form the proposed "500/500" score for a given country. Australia scores poorly in the 500/500 metric when compared with other countries with a similar ARWU ranking, an indication that HPC-based researchers in Australia are at a relative disadvantage with respect to their overseas competitors. For HPC problems where single precision is sufficient, commodity GPUs provide a cost-effective means of quenching the computational thirst of otherwise parched Lattice practitioners traversing the Australian supercomputing desert. We explore some of the more difficult terrain in single precision territory, finding that BiCGStab is unreliable in single precision at large lattice sizes. We test the CGNE and CGNR forms of the conjugate gradient method on the normal equations. Both CGNE and a modified form of CGNR (with restarts) provide reliable convergence for quark propagator calculations in single precision.

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Building the International Lattice Data Grid

Cited by 86 publications

References 14 publications

Searching for low-lying multi-particle thresholds in lattice spectroscopy

Searching for low-lying multi-particle thresholds in lattice spectroscopy

Nucleon Magnetic Properties from Lattice QCD And The Background Field Method

GPUs: An Oasis in the Supercomputing Desert

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