2,348 research outputs found
Experiences with OpenMP in tmLQCD
An overview is given of the lessons learned from the introduction of
multi-threading using OpenMP in tmLQCD. In particular, programming style,
performance measurements, cache misses, scaling, thread distribution for hybrid
codes, race conditions, the overlapping of communication and computation and
the measurement and reduction of certain overheads are discussed. Performance
measurements and sampling profiles are given for different implementations of
the hopping matrix computational kernel.Comment: presented at the 31st International Symposium on Lattice Field Theory
(Lattice 2013), 29 July - 3 August 2013, Mainz, German
Service oriented interactive media (SOIM) engines enabled by optimized resource sharing
In the same way as cloud computing, Software as a Service (SaaS) and Content Centric Networking (CCN) triggered a new class of software architectures fundamentally different from traditional desktop software, service oriented networking (SON) suggests a new class of media engine technologies, which we call Service Oriented Interactive Media (SOIM) engines. This includes a new approach for game engines and more generally interactive media engines for entertainment, training, educational and dashboard applications. Porting traditional game engines and interactive media engines to the cloud without fundamentally changing the architecture, as done frequently, can enable already various advantages of cloud computing for such kinds of applications, for example simple and transparent upgrading of content and unified user experience on all end-user devices. This paper discusses a new architecture for game engines and interactive media engines fundamentally designed for cloud and SON. Main advantages of SOIM engines are significantly higher resource efficiency, leading to a fraction of cloud hosting costs. SOIM engines achieve these benefits by multilayered data sharing, efficiently handling many input and output channels for video, audio, and 3D world synchronization, and smart user session and session slot management. Architecture and results of a prototype implementation of a SOIM engine are discussed
Global Positioning of Spin GPS Scheme for Half-Spin Massive Spinors
We present a simple and flexible method of keeping track of the complex
phases and spin quantization axes for half-spin initial- and final-state Weyl
spinors in scattering amplitudes of Standard Model high energy physics
processes. Both cases of massless and massive spinors are discussed. The method
is demonstrated and checked numerically for spin correlations in tau tau-bar
production and decay. Its main application will be in the forthcoming work of
combining effects due to multiple photon emission (exponentiation) and spin,
embodied in the Monte Carlo event generators for production and decay of
unstable fermions such as the tau lepton, t-quark and hypothetical new heavy
particles.Comment: 13 pages, 1 eps figur
Practical Implementation of Lattice QCD Simulation on Intel Xeon Phi Knights Landing
We investigate implementation of lattice Quantum Chromodynamics (QCD) code on
the Intel Xeon Phi Knights Landing (KNL). The most time consuming part of the
numerical simulations of lattice QCD is a solver of linear equation for a large
sparse matrix that represents the strong interaction among quarks. To establish
widely applicable prescriptions, we examine rather general methods for the SIMD
architecture of KNL, such as using intrinsics and manual prefetching, to the
matrix multiplication and iterative solver algorithms. Based on the performance
measured on the Oakforest-PACS system, we discuss the performance tuning on KNL
as well as the code design for facilitating such tuning on SIMD architecture
and massively parallel machines.Comment: 8 pages, 12 figures. Talk given at LHAM'17 "5th International
Workshop on Legacy HPC Application Migration" in CANDAR'17 "The Fifth
International Symposium on Computing and Networking" and to appear in the
proceeding
Shifted Landau levels in curved graphene sheets
We study the Landau levels in curved graphene sheets by measuring the
discrete energy spectrum in the presence of a magnetic field. We observe that
in rippled graphene sheets, the Landau energy levels satisfy the same square
root dependence on the energy quantum number as in flat sheets, . Though, we find that the Landau levels in curved sheets are shifted
towards lower energies by an amount proportional to the average spatial
deformation of the sheet. Our findings are relevant for the quantum Hall effect
in curved graphene sheets, which is directly related to Landau quantization.
For the purpose of this study, we develop a new numerical method, based on the
quantum lattice Boltzmann method, to solve the Dirac equation on curved
manifolds, describing the low-energetic states in strained graphene sheets
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