6.1  OMP_SCHEDULE

The OMP_SCHEDULE environment variable controls the schedule kind and chunk size of all loop directives that have the schedule kind runtime, by setting the value of the run-sched-var ICV.

The value of this environment variable takes the form:

[modifier:]kind[, chunk]

where

• modifier is one of monotonic or nonmonotonic;
• kind is one of static, dynamic, guided, or auto;
• chunk is an optional positive integer that specifies the chunk size.

If the modifier is not present, the modifier is set to monotonic if kind is static; for any other kind it is set to nonmonotonic.

If chunk is present, white space may be on either side of the “,”. See Section 2.9.2 on page 288 for a detailed description of the schedule kinds.

The behavior of the program is implementation defined if the value of OMP_SCHEDULE does not conform to the above format.

Implementation specific schedules cannot be specified in OMP_SCHEDULE. They can only be specified by calling omp_set_schedule, described in Section 3.2.12 on page 1058.

Examples:  

 
setenv OMP_SCHEDULE "guided,4" 
setenv OMP_SCHEDULE "dynamic" 
setenv OMP_SCHEDULE "nonmonotonic:dynamic,4"
  

Cross References

• run-sched-var ICV, see Section 2.5 on page 171.
• Worksharing-Loop construct, see Section 2.9.2 on page 288.
• Parallel worksharing-loop construct, see Section 2.13.1 on page 532.
• omp_set_schedule routine, see Section 3.2.12 on page 1058.
• omp_get_schedule routine, see Section 3.2.13 on page 1062.