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4.1 OMP_SCHEDULE 

OMP_SCHEDULE applies only to for and parallel for directives that have the schedule type runtime. The schedule type and chunk size for all such loops can be set at run time by setting this environment variable to any of the recognized schedule types and to an optional chunk_size.

For for and parallel for directives that have a schedule type other than runtime, OMP_SCHEDULE is ignored. The default value for this environment variable is implementation-defined. If the optional chunk_size is set, the value must be positive. If chunk_size is not set, a value of 1 is assumed, except in the case of a static schedule. For a static schedule, the default chunk size is set to the loop iteration space divided by the number of threads applied to the loop.

Example:

setenv OMP_SCHEDULE "guided,4"
setenv OMP_SCHEDULE "dynamic"

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