5. Let's build a Cost-Optimized QCD Cluster

• LatFor example:

  • HMC with Wilson fermions,
  • 323 x 64, = 0.3-0.6
  • aim for 0.5 Tflops sust. (for 1 – 5 Tflops-hrs per tra.)

• Lüscher/Wittig: 1 Gflops / dual XEON 2.0 Ghz node under Myrinet 2000, parallel mode

• Fodor/Katz: GigE mesh is equivalent to Myrinet

• 32/2 x 64/2 = 512 procs = 256 dual XEON nodes gives about 250 Gflops sustained

• For 0.5 susTflops or smaller lattices: 3-d grid