Revision as of 13:31, 29 January 2021 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,343 edits →Why is my HPC model getting unstable right at the beginning? And why are my control numbers lower than they could be? ← Older edit		Revision as of 14:04, 29 January 2021 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,343 edits →My HPC model uses double precision due to unstable 1D channel. How can I make it stable in single precision? Newer edit →
Line 103: * Improve stability of the 1D features and 1D/2D links for it to perform well in single precision. The _TSMB and _TSMB1d2d layers might help locating specific features that could be worked on. * Remove 1D channel completely and use Quadtree mesh to sufficiently refine resolution of the creek in 2D. <br> = Should I see 100% GPU utilisation in the TUFLOW console window when no other processes are running? = HPC still does a small amount of work on CPU such as the model initiation and the final step of data reduction for model volume, control numbers, and stability checks. Even in a perfect world and 2D only model it isn't possible to see 100% GPU utilisation. If there are any 1D features in the model the GPU utilisation will be even lower as 1D is processed on CPU only. A model with 1D ESTRY connection can potentially be doing a lot of work on CPU, perhaps as much as 90% CPU and 10% GPU. If the CPU hardware is not matched correctly with the GPU card it can become a bottleneck for HPC-GPU runs even with a few 1D elements. We are investigating the possibility of parallelising 1D for future releases so it is able to run on GPU.<br> <br>

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