Early Performance Evaluation of Lattice QCD on POWER+GPU Cluster

Abstract

As supercomputers are shifting from peta-scale to exa-scale, computers with accelerators such as GPUs, MICs and FPGAs have become one of the big trends of supercomputer because of their low energy consumption and high density. Now IBM's POWER processor has quite new power, Nvidia's Tesla GPU brings huge computational capability. It is important for us to understand how this new POWER+GPU environment brings power to the actual applications in the early stage. We implemented Wilson-Dirac operator and BiCGStab solver using CUDA7.0 on the POWER+GPU cluster and evaluated the performance.

Recent Applications of Self-Consistent Green’s Function Theory to Nuclei

“…We refer to this as the HAL469 S U(3) interaction. Note that more advanced interactions at near the physical pion mass are currently being computed [10]. For forces with a strong short-range repulsion, like the HAL QCD interactions, usual truncations of the oscillator space (of up to 12 shells in this case) are not sufficient and a resummation of ladder diagrams outside the model space is required.…”

Hyperons: the strange ingredients of the nuclear equation of state

“…The HALQCD collaboration follows a method to extract the different baryon-baryon potentials from the Nambu-Bethe-Salpeter wave function measured on the lattice. Recently this collaboration managed to approach the region of physical masses obtaining results for various nucleon-nucleon, hyperon-nucleon and hyperon-hyperon interaction channels [152][153][154] at a single value of the lattice volume and of the lattice spacing.…”

Scattering of decuplet baryons in chiral effective field theory

“…[15,16], performed in the way described above, may be fairly realistic. In this context let us mention that also for other baryon-baryon channels LQCD simulations have been performed with almost physical quark masses [34][35][36] and preliminary results for phase shifts have become available 3 for some channels.…”