descr — Prints a description of current preconditioner

call prec%descr()
call prec%descr(iout, root)

Type:: Asynchronous.
On Entry
prec: the preconditioner. Scope: local
Type: required
Intent: in.
Specified as: a preconditioner data structure psb_prec_type.
iout: output unit. Scope: local
Type: optional
Intent: in.
Specified as: an integer number. Default: default output unit.
root: Process from which to print Scope: local
Type: optional
Intent: in.
Specified as: an integer number between 0 and np - 1, in which case the specified process will print the description, or -1, in which case all processes will print. Default: 0.