This commit adds a new (hidden) debugging option,
DebugEmitCellPartition (--debug-emit-cell-partition)
which, when set, will cause each rank to write a three-column text
file of the form
MPI_Rank Cartesian_Index NLDD_Domain_ID
into the directory
partition/CaseName
of the run's output directory. That file will be named according to
the process' MPI rank, so the first column will be the same as the
file name.
The option is primarily intended for debugging the NLDD partitioning
scheme, so is mostly reserved for runs with low MPI sizes (e.g.,
less than 20).
While here, also make the MPIPartitionFromFile helper class aware of
this format so that we can use concatenated output files as an input
to the MPI partitioning algorithm for repeatability.
This commit switches the current implementation of
'partitionCellsZoltan()', i.e., 'partitionCells("zoltan", ...)' into
using the MPI-aware ParallelNLDDPartitioningZoltan utility. In
doing so we make 'partitionCellsZoltan()' private since its
availability is not guaranteed. We also slightly reorder the
parameters and switch from passing a "Grid" into passing a
"GridView" as an argument to partitionCells(), and specialise this
function for the known grid views in OPM Flow.
We extract the Zoltan-related parameters out to an Entity-dependent
helper structure and move the complexity of forming this type to a
new helper function, BlackoilModelEbosNldd::partitionCells().
