A.2.108 -xautopar

This option does not accept OpenMP parallelization directives. The Sun-specific MP pragmas have been deprecated and are no longer supported. See the Sun Studio 12: OpenMP API User’s Guide for migration information to the directives of the standard.

(SPARC) Turns on automatic parallelization for multiple processors. Does dependence analysis (analyze loops for inter-iteration data dependence) and loop restructuring. If optimization is not at -xO3 or higher, optimization is raised to -xO3 and a warning is issued.

Avoid -xautopar if you do your own thread management.

To achieve faster execution, this option requires a multiple processor system. On a single-processor system, the resulting binary usually runs slower.

To run a parallelized program in a multithreaded environment, you must set the OMP_NUM_THREADS environment variable prior to execution. See the Sun Studio 12: OpenMP API User’s Guide for more information.

If you use -xautopar and compile and link in one step, then linking automatically includes the microtasking library and the threads-safe C runtime library. If you use -xautopar and compile and link in separate steps, then you must also link with -xautopar.

A.2.108.1 See Also

A.2.154 -xopenmp[=i]