Recent Experiences with the Cray T3E_600 at the SDSC |
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Joel E. Tohline, John Cazes, and Patrick Motl
Department of Physics &
Astronomy
Louisiana State University
Performance Measures using the Portland Group Compiler (PGHPF):
CFD Code Timings
on the SDSC T3E_600a
Using PGHPF (seconds per integration timestep) |
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643 | 128×642 | 1282×64 | 1283 | 256×1282 | 2562×128 | 2563 | |
2 | 26.60 | -- | -- | -- | -- | -- | -- |
4 | 12.38 | 22.96 | -- | -- | -- | -- | -- |
8 | 6.98 | b12.49 | 23.75 | -- | -- | -- | -- |
16 | 3.84 | 7.18 | 13.21 | 23.89 | -- | -- | -- |
32 | 2.07 | c3.75 | 6.97 | 12.49 | 24.09 | -- | -- |
64 | -- | -- | 3.86 | 7.07 | 12.69 | -- | -- |
128 | -- | -- | -- | 3.95 | -- | 13.54 | 24.64 |
Performance Measures using mpi:
CFD Code Timings
on the SDSC T3E_600a
Using mpi (seconds per integration timestep) |
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662×64 | 662×128 | 130×66×128 | 1302×128 | 1302×256 | 258×130×256 | 2582×256 | 2582×512 | |
4 | 2.456 | 4.945 | 9.212 | -- | -- | -- | -- | -- |
8 | 1.468 | b2.978 | 5.078 | 10.07 | -- | -- | -- | -- |
16 | 0.775 | 1.630 | 2.711 | 5.211 | 11.37 | -- | -- | -- |
32 | 0.471 | c0.968 | 1.584 | 3.027 | 6.573 | 11.32 | -- | -- |
64 | -- | -- | 0.878 | 1.617 | 3.493 | 5.983 | 11.40 | -- |
128 | -- | -- | -- | 0.968 | 2.057 | 3.453 | 6.548 | 15.19 |
CFD Code Timings
on the SDSC T3E_600a
Ratio of PGHPF timings to mpi timings |
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643 | 128×642 | 1282×64 | 1283 | 256×1282 | 2562×128 | 2563 | |
4 | 5.36 | -- | -- | -- | -- | -- | -- |
8 | -- | 4.46 | -- | -- | -- | -- | -- |
16 | -- | -- | 5.10 | -- | -- | -- | -- |
32 | -- | -- | -- | 4.26 | -- | -- | -- |
64 | -- | -- | -- | -- | 3.75 | -- | -- |
128 | -- | -- | -- | -- | -- | 4.01 | -- |
Performance Measures using mpi:
Gravitational CFD
Code Timings
on the SDSC T3E_600a
Using mpi (seconds per integration timestep) |
|||||||
662×64 | 662×128 | 130×66×128 | 1302×128 | 1302×256 | 258×130×256 | 2582×256 | |
4 | 3.552 | 7.016 | -- | -- | -- | -- | -- |
8 | 2.050 | 4.122 | -- | -- | -- | -- | -- |
16 | 1.118 | 2.237 | 4.008 | -- | -- | -- | -- |
32 | 0.6562 | 1.311 | 2.269 | 4.394 | -- | -- | -- |
64 | -- | -- | 1.280 | 2.381 | 4.850 | 8.638 | -- |
128 | -- | -- | -- | 1.398 | 2.832 | 4.848 | -- |