Michael Clark Harvard University

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Wednesday, 18 November 2009 Case Study: Jlab • Require 150 Gflops sustained performance per job • Nehalem-Infiniband cluster • 8 nodes • $0.20 per Mflop • GPU solution • 4x GTX 285 per Nehalem box • Trivial parallelism • $0.02 per Mflop • 30 Tflops sustained
Wednesday, 18 November 2009 • Need to scale to many GPUs • Size of problem • Raw flops • Preliminary implementation Multi-GPU • No overlap of comms and compute • 1 MPI process per GPU • 90% efficiency on 4 GPUs (S1070) • Many GPUs challenging but possible • 1 GPU per PCIe slot • New algorithms
Page 1 and 2: Wednesday, 18 November 2009 GPU Mix
Page 3 and 4: Quantum ChromoDynamics • QCD is t
Page 5 and 6: Wednesday, 18 November 2009 topolog
Page 7 and 8: Wednesday, 18 November 2009
Page 9 and 10: Wednesday, 18 November 2009 Lattice
Page 11 and 12: GPU Hardware GTX 280 Flops: single
Page 13 and 14: Iterative Linear Solvers • Many p
Page 15 and 16: Wednesday, 18 November 2009 Dirac o
Page 17 and 18: Wednesday, 18 November 2009 Wilson
Page 23 and 24: !"#$%&' $" $! #" #! " ! Wednesday,
Page 25 and 26: Wednesday, 18 November 2009 SpMV II
Page 27 and 28: ions SpMV IV CD software to use the
Page 29 and 30: Gflops 140 120 100 Wednesday, 18 No
Page 31 and 32: Wednesday, 18 November 2009 Krylov
Page 33 and 34: Mixed-Precision Solvers • Require
Page 35 and 36: Number of iterations 3000 2500 2000
Page 37 and 38: Wednesday, 18 November 2009 Half Pr
Page 39 and 40: Time to solution / s 300 250 200 15
Page 41 and 42: Wednesday, 18 November 2009 Perform
Page 43: Wednesday, 18 November 2009 Perform
Page 47 and 48: Matrix-vector products 20000 15000
Page 49 and 50: Wednesday, 18 November 2009 Conclus

Michael Clark Harvard University

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