Default computational grid for 2-D block-cyclic distributed arrays
grid = codistributor2dbc.defaultLabGrid()
grid = codistributor2dbc.defaultLabGrid() returns a vector, grid = [nrow ncol], defining a computational grid of nrow-by-ncol workers in the open parallel pool, such that numlabs = nrow x ncol.
The grid defined by codistributor2dbc.defaultLabGrid is as close to a square as possible. The following rules define nrow and ncol:
If numlabs is a perfect square, nrow = ncol = sqrt(numlabs).
If numlabs is an odd power of 2, then nrow = ncol/2 = sqrt(numlabs/2).
nrow <= ncol.
If numlabs is a prime, nrow = 1, ncol = numlabs.
nrow is the greatest integer less than or equal to sqrt(numlabs) for which ncol = numlabs/nrow is also an integer.
View the computational grid layout of the default distribution scheme for the open parallel pool.
spmd grid = codistributor2dbc.defaultLabGrid end