Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.31: Poster

Wednesday, April 2, 2014, 15:00–19:00, P2

Accelerations of Diagrammatic Determinantal Quantum Monte Carlo Calculations using GPUs — •Markus Schmitt¹, Iain Bethune², and Thomas Pruschke³ — ¹Georg-August-Universität, Göttingen, Germany — ²EPCC (University of Edinburgh), Edinburgh, UK — ³Georg-August-Universität, Göttingen, Germany

Diagrammatic Determinantal Quantum Monte Carlo (DDQMC) algorithms are used to solve quantum impurity models such as the Anderson model. The calculation of acceptance rates and observables during the Monte Carlo walk involves linear algebra operations whose computational expense increases with decreasing temperature. Thus, the lower boundary of the treatable temperature range is limited by the available compute capacity. In order to make use of GPUs as cheap and powerful accelerators parts of a DDQMC code were ported to CUDA. The measurement of the observables turned out to be well suited for acceleration on GPUs and a speedup of more than 100 times over the unaccelerated version was obtained for the largest problem size under consideration.