Some IBM processors are capable of shared-memory parallel processing. Compile with -qsmp to generate the threaded code needed to exploit this capability. The option implies a -O2 optimization level. The default behavior for the option without suboptions is to do automatic parallelization with optimization.
The most commonly used -qsmp suboptions are
summarized in the following table.
Commonly used -qsmp suboptions | |
Suboption | Behavior |
---|---|
auto | Instructs the compiler to automatically generate parallel code where possible without user assistance. This option also recognizes all the SMP directives. |
omp | Enforces compliance with the OpenMP Fortran API for specifying explicit parallelism. Note that -qsmp=omp is currently incompatible with -qsmp=auto. |
opt | Instructs the compiler to optimize as well as parallelize. The optimization is equivalent to -O2 -qhot in the absence of other optimization options. The default setting of -qsmp is -qsmp=auto:noomp:opt. |
suboptions | Other values for the suboption provide control over thread scheduling, nested parallelism, locking, and so on. |