Halos : Différence entre versions
De LMDZPedia
| (3 révisions intermédiaires par le même utilisateur non affichées) | |||
| Ligne 1 : | Ligne 1 : | ||
| + | == Warning: Quite technical stuff here!!! == | ||
| + | In the dynamics, the MPI assigned domains to a each core can be hard to track of... especially as it also depends on the grid (scalar, U, V) a given variable is | ||
| − | + | Some nomenclature: | |
| − | + | * jjb_u, jje_u => "latitudinal indexes", for a variable on the (iip1,jjb_u:jje_u) horizontal grid U grid | |
| + | * jjb_v, jje_v => "latitudinal indexes", for a variable on the (iip1,jjb_v:jje_v) horizontal grid V grid | ||
| + | * ijb_u => "ij": linear index (horizontal grid) "b": begin (i.e. index at which the domain starts) "_u": U grid | ||
| + | * ije_u => "ij": linear index (horizontal grid) "e": end (i.e. index at which the domain ends) "_u": U grid | ||
| + | * ijb_v => "ij": linear index (horizontal grid) "b": begin (i.e. index at which the domain starts) "_v": V grid | ||
| + | * ije_v => "ij": linear index (horizontal grid) "e": end (i.e. index at which the domain ends) "_v": V grid | ||
| − | + | These boundaries include halos (i.e. neighboring values at the junction with adjacent domains), whereas the ij_begin and ij_end don't | |
| + | (see parallel_lmdz.F90). | ||
| − | + | Scalars, which are not technically on the U grid, but on a grid with identical dimensions, are indexed as if they were on the U grid. | |
| − | |||
| − | |||
| − | |||
| − | + | The Register_SwapField routines copy the inner boundary values of a domain to propagate them to the other domains and fill their respective halos. | |
| − | |||
| − | + | 04/11/2021 | |
| − | |||
[[Category:Parallel]] | [[Category:Parallel]] | ||
| + | [[Category:ExpertDev]] | ||
Version actuelle en date du 17 novembre 2021 à 13:51
Warning: Quite technical stuff here!!!
In the dynamics, the MPI assigned domains to a each core can be hard to track of... especially as it also depends on the grid (scalar, U, V) a given variable is
Some nomenclature:
- jjb_u, jje_u => "latitudinal indexes", for a variable on the (iip1,jjb_u:jje_u) horizontal grid U grid
- jjb_v, jje_v => "latitudinal indexes", for a variable on the (iip1,jjb_v:jje_v) horizontal grid V grid
- ijb_u => "ij": linear index (horizontal grid) "b": begin (i.e. index at which the domain starts) "_u": U grid
- ije_u => "ij": linear index (horizontal grid) "e": end (i.e. index at which the domain ends) "_u": U grid
- ijb_v => "ij": linear index (horizontal grid) "b": begin (i.e. index at which the domain starts) "_v": V grid
- ije_v => "ij": linear index (horizontal grid) "e": end (i.e. index at which the domain ends) "_v": V grid
These boundaries include halos (i.e. neighboring values at the junction with adjacent domains), whereas the ij_begin and ij_end don't (see parallel_lmdz.F90).
Scalars, which are not technically on the U grid, but on a grid with identical dimensions, are indexed as if they were on the U grid.
The Register_SwapField routines copy the inner boundary values of a domain to propagate them to the other domains and fill their respective halos.
04/11/2021
