Benchmarking MILC code with OpenMP and MPI

Details Benchmarking MILC code with OpenMP and MPI Benchmarking MILC code with OpenMP and MPI

2000-11-07

arxiv.org/abs/hep-lat/0011037v1

Nucl.Phys.Proc.Suppl. 94 (2001) 841-845

Physics

High Energy Physics

High Energy Physics - Lattice

Lattice 2000 (Computers), 5 pages, 3 figures

Scientific paper

10.1016/S0920-5632(01)01016-7

A trend in high performance computers that is becoming increasingly popular is the use of symmetric multiprocessing (SMP) rather than the older paradigm of MPP. MPI codes that ran and scaled well on MPP machines can often be run on an SMP machine using the vendor's version of MPI. However, this approach may not make optimal use of the (expensive) SMP hardware. More significantly, there are machines like Blue Horizon, an IBM SP with 8-way SMP nodes at the San Diego Supercomputer Center that can only support 4 MPI processes per node (with the current switch). On such a machine it is imperative to be able to use OpenMP parallelism on the node, and MPI between nodes. We describe the challenges of converting MILC MPI code to using a second level of OpenMP parallelism, and benchmarks on IBM and Sun computers.

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