Difference between revisions of "UM version4.5 benchmarks"
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{| border="1" cellpadding="10" | {| border="1" cellpadding="10" | ||
| − | || Domain Decomposition || Model-years/day | + | || Domain Decomposition || Number of Cores || Model-years/day |
|- | |- | ||
| − | || 4x2 || ~327 | + | || 4x2 || 8 || ~327 |
|- | |- | ||
| − | || 8x2 || ~450 | + | || 8x2 || 16 || ~450 |
|- | |- | ||
| − | || 8x4 || ~480 | + | || 8x4 || 32 || ~480 |
|- | |- | ||
|} | |} | ||
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{| border="1" cellpadding="10" | {| border="1" cellpadding="10" | ||
| − | || Domain Decomposition || Model-years/day | + | || Domain Decomposition || Number of Cores || Model-years/day |
|- | |- | ||
| − | || 8x2 || ~48 | + | || 8x2 || 16 || ~48 |
|- | |- | ||
| − | || 8x4 || ~65 | + | || 8x4 || 32 || ~65 |
|- | |- | ||
|} | |} | ||
Revision as of 15:27, 17 December 2012
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 | Number of Cores | Model-years/day |
| 4x2 | 8 | ~327 |
| 8x2 | 16 | ~450 |
| 8x4 | 32 | ~480 |
- The last line of this table shows a real problem scaling beyond 16 cores. Load balance?
- Would like to try to improve file writing performance and re-run.
HadCM3
| Domain Decomposition | Number of Cores | Model-years/day |
| 8x2 | 16 | ~48 |
| 8x4 | 32 | ~65 |