Gridding and Load Balancing Inputs

The following inputs must be preceded by “amr” and determine how we create the grids and how often we regrid. The most commonly used options are listed here. See the AMReX documentation on Runtime Parameters for additional options.

	Description	Type	Default
regrid_int	How often to regrid (in number of steps at level 0) if regrid_int = -1 then no regridding will occur	Int	-1
max_grid_size_x	Maximum number of cells in each grid in x-direction (on all levels, unless one value per level is given)	Int	2D: 128 3D CPU: 32 3D GPU: 64
max_grid_size_y	Maximum number of cells in each grid in y-direction (on all levels, unless one value per level is given)	Int	2D: 128 3D CPU: 32 3D GPU: 64
max_grid_size_z	Maximum number of cells in each grid in z-direction (3D) (on all levels, unless one value per level is given)	Int	CPU: 32 GPU: 64
blocking_factor_x	Each grid must be divisible by blocking_factor_x in x-direction	Int	8
blocking_factor_y	Each grid must be divisible by blocking_factor_y in y-direction	Int	8
blocking_factor_z	Each grid must be divisible by blocking_factor_z in z-direction (3D)	Int	8

The following inputs must be preceded by “fabarray” and determine how we create the logical tiles:

	Description	Type	Default
mfiter_tile_size	Maximum number of cells in each direction for (logical) tiles (3D CPU-only)	IntVect	1024000 1024000,8,8