13,829 research outputs found
GAMER with out-of-core computation
GAMER is a GPU-accelerated Adaptive-MEsh-Refinement code for astrophysical
simulations. In this work, two further extensions of the code are reported.
First, we have implemented the MUSCL-Hancock method with the Roe's Riemann
solver for the hydrodynamic evolution, by which the accuracy, overall
performance and the GPU versus CPU speed-up factor are improved. Second, we
have implemented the out-of-core computation, which utilizes the large storage
space of multiple hard disks as the additional run-time virtual memory and
permits an extremely large problem to be solved in a relatively small-size GPU
cluster. The communication overhead associated with the data transfer between
the parallel hard disks and the main memory is carefully reduced by overlapping
it with the CPU/GPU computations.Comment: 4 pages, 4 figures, conference proceedings of IAU Symposium 270 (eds.
Alves, Elmegreen, Girart, Trimble
Lattices from Codes for Harnessing Interference: An Overview and Generalizations
In this paper, using compute-and-forward as an example, we provide an
overview of constructions of lattices from codes that possess the right
algebraic structures for harnessing interference. This includes Construction A,
Construction D, and Construction (previously called product
construction) recently proposed by the authors. We then discuss two
generalizations where the first one is a general construction of lattices named
Construction subsuming the above three constructions as special cases
and the second one is to go beyond principal ideal domains and build lattices
over algebraic integers
Exact Pseudofermion Action for Monte Carlo Simulation of Domain-Wall Fermion
We present an exact pseudofermion action for hybrid Monte Carlo simulation
(HMC) of one-flavor domain-wall fermion (DWF), with the effective 4-dimensional
Dirac operator equal to the optimal rational approximation of the overlap-Dirac
operator with kernel , where and are constants. Using this exact pseudofermion action, we perform HMC of
one-flavor QCD, and compare its characteristics with the widely used rational
hybrid Monte Carlo algorithm (RHMC). Moreover, to demonstrate the practicality
of the exact one-flavor algorithm (EOFA), we perform the first dynamical
simulation of the (1+1)-flavors QCD with DWF.Comment: 13 pages, 4 figures, v2: Simulation of (1+1)-flavors QCD with DWF,
and references added. To appear in Phys. Lett.
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