HPC FAQ: Difference between revisions
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This is largely based on hardware that is used to run HPC models (CPU and GPU) and its performance. On average, HPC using GPU hardware runs about 10 to 20 times faster than Classic and about 30 to 40 times faster than HPC using the default number of CPU threads. Even though HPC using CPU hardware is with default settings slower than Classic, more CPU threads can be used to achieve faster run times. As TUFLOW Classic is not parallelised it can only run on one CPU thread and the runtime cannot be further improved with more CPU resources.<br>
For further information and discussion see: [[Hardware_Benchmarking_Topic_HPC_on_CPU_vs_GPU | Hardware Benchmarking Topic HPC on CPU vs GPU]]
=Will results from TUFLOW HPC using CPU match with HPC using GPU?=
TUFLOW HPC using CPU should produce identical results with TUFLOW HPC using GPU, because they use the same solver. However, the HPC GPU and HPC CPU are compiled by different compilers, which can produce minor differences down to numerical precision. Also note that minor difference between HPC CPU and HPC GPU can be amplified in a model that is already unstable. If there are large differences between HPC GPU and HPC CPU modelling results, it could be an indicator of model instability.
= Why is my model using 2020 HPC slower than 2018 HPC? =
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