http://hdl.handle.net/2440/12354 2013-05-22T16:31:05Z http://hdl.handle.net/2440/77590 Title: N*(1535) electroproduction at high Q² Author: Ramalho, G.; Peña, M. T.; Tsushima, Kazuo 2011-12-31T13:30:00Z http://hdl.handle.net/2440/77584 Title: Exploring excited states of the nucleon in 2+1 flavor lattice QCD Author: Mahbub, Md. Selim; Kamleh, Waseem Rolf; Leinweber, Derek Bruce; Moran, Peter John; Williams, Anthony Gordon 2011-12-31T13:30:00Z http://hdl.handle.net/2440/77583 Title: Dressed-quarks and the Roper resonance Author: Roberts, C. D.; Cloët, Ian Christopher; Chang, L.; Roberts, H. L. L. 2011-12-31T13:30:00Z http://hdl.handle.net/2440/77575 Title: GPUs: an oasis in the supercomputing desert Author: Kamleh, Waseem Rolf Abstract: 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. Description: Extent: 7p. 2011-12-31T13:30:00Z