Present: Roland, Swapnil, Allen, Lucas, Liwei, Jay, Steve
Performance Issues:
-
Liwei + Jay observed CarpetX being slower than Carpet in certain simulations when using CPUs (hydro + spacetime + 14 AMR levels). -
Swapnil observed similar speeds between Carpet(X) with CarpetX using much fewer nodes. -
For GPUs, Swapnil recommends: less boxes (equal to # of GPUs, perhaps less) controlled via max_grid_size for each level, set AMReX “refine_grid_layout” to “no”. -
For CPUs, Roland recommends: port CarpetX Z4c to Carpet, or run without spacetime, or run wavetoy to isolate effects of science code vs infrastructure; try changing tiling parameters. -
Compare w/ AthenaK: they advertise 98% efficient weak scaling. Due to infrastructure, # ghost zones, etc.? Potential apples to apples GPU code comparison in the future.
Updates:
-
Steve
-
Wrote introduction to subcycling paper. -
Lucas
-
Multipatch tests working, looking towards evolving black holes. -
Allen
-
MeudonBNSX working without OMP, check if array index is accurate, or put problematic code inside omp critical.
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End of Carpetx-developers Digest, Vol 37, Issue 2