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## psb_init -- Initializes PSBLAS parallel environment

    call psb_init(icontxt, np)

This subroutine initializes the PSBLAS parallel environment, defining a virtual parallel machine.

Type:
  Synchronous.
On Entry
np
  Number of processes in the PSBLAS virtual parallel machine.
  Scope: global.
  Type: optional.
  Intent: in.
  Specified as: an integer value. Default: use all available processes provided by the underlying parallel environment.

On Return
icontxt
  the communication context identifying the virtual parallel machine.
  Scope: global.
  Type: required.
  Intent: out.
  Specified as: an integer variable.

Notes

1. A call to this routine must precede any other PSBLAS call.
2. It is an error to specify a value for greater than the number of processes available in the underlying parallel execution environment.