[Carpetx-developers] Carpetx-developers Digest, Vol 37, Issue 2

[Allen Wen (RIT Student)]

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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