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