MPI Performance: QCDMPI

• QCDMPI is a public-domain code for calculations in lattice Quantum Chromodynamics

• Modest size

• Reasonably cache friendly (developed for MPP)

• Scales nicely on a T3E

  • At OSC: 300MHz 21164, 128 processors

• Instrumented to provide both calculational performance and communications bandwidth data

• No special tuning performed; only compiler options

• Examine SV1 scalability, and compare TCP versus shared memory communication

  • mpirun -np vs. mpirun -nt

• CF90 version: 3.4.0.1.0

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• -To look at one last application, we examined a parallel MPI code