UM version4.5 benchmarks

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Benchmarking UM Version4.5 on different Architectures

Preamble

  • Cluster/Parallel file systems are often a bottleneck.
  • If the model is not filesystem-bound, it is often (MPI massage) latency-bound.
  • Only the master process writes output, this can lead to load-balance issues, which hinder scaling.

AMD Bulldozer

Intel Westmere

Intel SandyBridge

  • Test system: Quad socket, 8-core E-4650L (2.60GHz) (L for Low power)
  • 20MB L3 cache


MPI message latency
0 bytes 128 bytes 1024 bytes
between sockets ~0.70us ~1.15us ~2.0us

FAMOUS

Domain Decomposition Model-years/day
4x2 ~327
8x2 ~450
8x4 ~480

HadCM3

Domain Decomposition Model-years/day
8x2 ~48
8x4 ~65