2,828 research outputs found
Comparison of the mass preconditioned HMC and the DD-HMC algorithm for two-flavour QCD
Mass preconditioned HMC and DD-HMC are among the most popular algorithms to
simulate Wilson fermions. We present a comparison of the performance of the two
algorithms for realistic quark masses and lattice sizes. In particular, we use
the locally deflated solver of the DD-HMC environment also for the mass
preconditioned simulations.Comment: 7 pages, 2 figures. Presented at the XXVIII International Symposium
on Lattice Field Theory (Lattice 2010), June 14-19 2010, Villasimius, Ital
Platform independent profiling of a QCD code
The supercomputing platforms available for high performance computing based
research evolve at a great rate. However, this rapid development of novel
technologies requires constant adaptations and optimizations of the existing
codes for each new machine architecture. In such context, minimizing time of
efficiently porting the code on a new platform is of crucial importance. A
possible solution for this common challenge is to use simulations of the
application that can assist in detecting performance bottlenecks. Due to
prohibitive costs of classical cycle-accurate simulators, coarse-grain
simulations are more suitable for large parallel and distributed systems. We
present a procedure of implementing the profiling for openQCD code [1] through
simulation, which will enable the global reduction of the cost of profiling and
optimizing this code commonly used in the lattice QCD community. Our approach
is based on well-known SimGrid simulator [2], which allows for fast and
accurate performance predictions of HPC codes. Additionally, accurate
estimations of the program behavior on some future machines, not yet accessible
to us, are anticipated
Strange quark mass and Lambda parameter by the ALPHA collaboration
We determine f_K for lattice QCD in the two flavor approximation with
non-perturbatively improved Wilson fermions. The result is used to set the
scale for dimensionful quantities in CLS/ALPHA simulations. To control its
dependence on the light quark mass, two different strategies for the chiral
extrapolation are applied. Combining f_K and the bare strange quark mass with
non-perturbative renormalization factors and step scaling functions computed in
the Schroedinger Functional, we determine the RGI strange quark mass and the
Lambda parameter in units of f_K.Comment: 7 pages, 4 figures; talk given at LATTICE 2011, XXIX International
Symposium on Lattice Field Theory, July 11-16 2011, Squaw Valley, Lake Tahoe,
Californi
Tourism product development for rural wellbeing in Serbia
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