[ET Trac] [Einstein Toolkit] #951: Add lssh field to cGroupDynamicData

[Einstein Toolkit]

#951: Add lssh field to cGroupDynamicData
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 Reporter:  eschnett     |       Owner:     
     Type:  enhancement  |      Status:  new
 Priority:  major        |   Milestone:     
Component:  Cactus       |     Version:     
 Keywords:               |  
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 The size and memory layout of grid functions is described by two
 variables, cctk_lsh and cctk_lssh. The structure cGroupDynamicData is
 missing the lssh field. I propose to add it, and am providing a patch.

 cctk_lssh is originally intended to support staggered grid functions, i.e.
 grid functions that have fewer "active" grid points than are allocated in
 memory (e.g. n-1 cells vs. n vertices). This can also be used to pad grid
 variables, which can improve cache efficiency and vectorisation.

 Fully supporting cctk_lssh in the flesh will later allow supporting
 padding in Carpet and/or PUGH.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/951>
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