Parallel Options and Directives Summary

The following table shows the f77 5.0 and f90 2.0 compilation options related to parallelization.

Table 10-1 Parallelization Options

Option	Flag
Automatic (only)	-autopar
Automatic and Reduction	-autopar -reduction
Explicit (only)	-explicitpar
Automatic and Explicit	-parallel
Automatic and Reduction and Explicit	-parallel -reduction
Show which loops are parallelized	-loopinfo
Show warnings with explicit	-vpara
Allocate local variables on stack	-stackvar
Use Sun-style MP directives	-mp=sun
Use Cray-style MP directives	-mp=cray

Notes on these options:

• -reduction requires -autopar.

• -autopar includes -depend and loop structure optimization.

• -parallel is equivalent to -autopar -explicitpar.

• -noautopar, -noexplicitpar, -noreduction are the negations.

• Parallelization options can be in any order, but they must be all lowercase.

• Reduction operations are not analyzed for explicitly parallelized loops.

• Use of any of the parallelization options requires a WorkShop license.

The following table shows the f77/f90 and f90 parallel directives.

Table 10-2 Parallel Directives

Parallel Directive	Purpose
C$PAR TASKCOMMON	Declares a common block private
C$PAR DOALL optional qualifiers	Parallelizes next loop, if possible
C$PAR DOSERIAL	Inhibits parallelization of next loop
C$PAR DOSERIAL*	Inhibits parallelization of loop nest