new cGH field cctk_patch

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Issue #2586 resolved
Roland Haas created an issue

Cactus currently does not contain a easy way to find out which patch (“map”) one is on for multipatch (Llama) simulations, instead requiring the use of the aliased function GetMap provided by Carpet.

Comments (7)

  1. Roland Haas reporter

    Please apply.

    Requests:

    • document cctk_patch in the UsersGuide
    • in the UsersGuide replace all use of “patch” meaning “disjoint grid patch” by “component” to avoid using “patch” for 2 different things (at least in the docs. Carpet still uses “patch” for “component” eg in CarpetIOHDF5’s checkpoint file handling code).
    • add code to PUGH / the flesh to set cctk_patch to 0 by default

  2. Roland Haas reporter

    Note that to find out the total number of patches (maps) one still has to call the aliased functon GetMaps. Not sure if there is a legit use for that information though (there is also not official way to find out the total number of components [not MPI ranks]). Also note that the assumption cctk_patch == 0 → Cartesian patch is most likely not true for eg the 6 patch cubed sphere system (which has no Cartesian block in the center). The function to query this would be MultiPatch_MapIsCartesian in the Coordinates thorn (which only requires knowledge of cctk_patch and of course calls it map).

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