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Status and plans at KEK Shoji Hashimoto Workshop on LQCD Software for Blue Gene/L, Boston University, Jan. 27, 2006.

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Presentation on theme: "Status and plans at KEK Shoji Hashimoto Workshop on LQCD Software for Blue Gene/L, Boston University, Jan. 27, 2006."— Presentation transcript:

1 Status and plans at KEK Shoji Hashimoto (KEK) @ Workshop on LQCD Software for Blue Gene/L, Boston University, Jan. 27, 2006

2 Jan 27, 2006 Shoji Hashimoto (KEK) 2 KEK supercomputer Leading computing facility in that time 1985Hitachi S810/10350 MFlops 1989Hitachi S820/803 GFlops 1995Fujitsu VPP500128 GFlops 2000Hitachi SR8000 F11.2 TFlops 2006Hitachi SR110002.15 TFlops IBM Blue Gene/L57 TFlops

3 Jan 27, 2006 Shoji Hashimoto (KEK) 3 Machine is for … “KEK Large Scale Simulation Program” : call for proposals of project to be performed on the supercomputer. Open for Japanese groups on particle and nuclear physics Program Advisory Committee (PAC) decides the approval and machine time allocation.

4 Jan 27, 2006 Shoji Hashimoto (KEK) 4 Usage Lattice QCD is a dominant user. About 60-80% of the computer time for lattice QCD –Among them, ~60% has been used by the JLQCD collaboration –Others include Hatsuda-Sasaki, Nakamura et al., Suganuma et al., Suzuki et al., … Simulation for accelerator design is another big user: beam-beam simulation for the KEK B factory.

5 Jan 27, 2006 Shoji Hashimoto (KEK) 5 JLQCD collaboration 1995~ (on VPP500) –Continuum limit in the quenched approximation BKBK f B, f D msms

6 Jan 27, 2006 Shoji Hashimoto (KEK) 6 JLQCD collaboration 2000~ (on SR8000) –Dynamical QCD with the improved Wilson fermion m V vs m PS 2 f B, f Bs K l3 form factor

7 Jan 27, 2006 Shoji Hashimoto (KEK) 7 Around the triangle

8 Jan 27, 2006 Shoji Hashimoto (KEK) 8 The wall Using the clover dynamical quark. Chiral extrapolation has been very hard to go beyond m s /2 Maybe, solved by new formulations, algorithms and/or machines… JLQCD Nf=2 (2002) MILC coarse lattice (2004)

9 Jan 27, 2006 Shoji Hashimoto (KEK) 9 Upgrade Process started in 2004. Called for bids from vendors. At least 20x more computing power, measured mainly using the QCD codes. No restriction on architecture (scalar or vector, etc.), but some amount must be a shared memory machine. Decision was made in September, 2005. Operation will start on March 1 st, 2006.

10 Jan 27, 2006 Shoji Hashimoto (KEK) 10 The next machine A combination of two systems: Hitachi SR11000 K1, 16 nodes, 2.15 TFlops peak performance. –POWER5 based, 16-way SMP IBM Blue Gene/L, 10 racks, 57.3 TFlops peak performance. 80TB RAID + tape library (~PB) Hitachi Ltd. is the prime contractor.

11 Jan 27, 2006 Shoji Hashimoto (KEK) 11 Installation Dec. 26, 2005

12 Jan 27, 2006 Shoji Hashimoto (KEK) 12 Installation Dec. 27, 2005 Jan. 11, 2006 Jan. 13, 2006

13 Jan 27, 2006 Shoji Hashimoto (KEK) 13 Jan. 25, 2006

14 Jan 27, 2006 Shoji Hashimoto (KEK) 14 Benchmark Wilson solver 24 3 x48 lattice on a midplace (8x8x8=512 nodes, half rack) 29.2% of the peak performance 32.6% if measured the Dslash only Domain-wall solver 24 3 x48 lattice on a midplace; Ns=16. Doesn’t fit in the on-chip L3 ~22% of the peak performance

15 Jan 27, 2006 Shoji Hashimoto (KEK) 15 JLQCD physics target Dynamical overlap fermion for light and heavy flavor physics: f , f K, B K, f B, etc. control chiral extrapolation with m q down to m s /4-m s /6. Starting from N f =2, then 2+1. 16 3 x32 and 24 3 x48 (multiples of 8 only!) Feasible with our current (crude) time estimate

16 Jan 27, 2006 Shoji Hashimoto (KEK) 16 Algorithm Hybrid Monte Carlo with the “reflection/refracion” –Fodor, Kats, Szabo; Cundy et al.; DeGrand, Schaefer Or, staying in a fixed topological sector –May choose a gauge action generating well- conditioned H W, e.g. Iwasaki, DBW2 –Numerically easier (can avoid O(V 2 ) scaling); better locality –Topological charge doesn’t change frequently, anyway, as the continuum limit is approached. –Artifact is O(1/V); Q dependence is analytically known for some quantities: Brower et al.

17 Jan 27, 2006 Shoji Hashimoto (KEK) 17 Summary New KEK machine will be made available for Japanese lattice community on March 1 st, 2006. Hitachi SR11000 (2.15 TF) + IBM BlueGene/L (57.3 TF) JLQCD is going to start dynamical overlap simulations; basic codes are under development/tests. Testing algorithms. Optimization for BGL has to be done according to the Jun’s strategy.

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