3 Partition definition

The coupling fields sent or received by a component are usually scattered among the different component processes. With OASIS3-MCT, all processes exchanging coupling data have to express in a global index space the local partitioning of the different grids onto which the data is expressed (see 2.2.4 for the grid definition). The processes not implied in the coupling do not have to call this routine (for backward compatibility with OASIS3-MCT_2.0, they may still call it describing a null partition, i.e. with ig_paral(:)=0).