-explicitpar

Parallelize loops explicitly marked by directives.

SPARC: 77/90

The compiler will generate parallel code even if there are data dependencies in the DO loop that would cause the loop to generate incorrect results when run in parallel. With explicit parallelization, it is the user's responsibility to correctly analyze loops for data dependency problems before marking them with parallelization directives.

This option turns on explicit parallelization. DO loops immediately preceded by DOALL directives will have threaded, parallel code compiled for them. Parallelization is only appropriate on multiprocessor systems. This option should not be used to compile programs that already do their own multithreading with calls to the libthread library.

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

To improve performance, also specify the -stackvar option when using any of the parallelization options, including -explicitpar.

If the optimization level is not -O3 or higher, it is raised to -O3 automatically.

For details, see the Parallelization chapter in the Fortran Programming Guide.

-g cancels -explicitpar. Debugging is facilitated by specifying -g without any optimization or parallelization options since not all debugging features are available when these options are invoked. See the dbx documentation for details.