OpenMP Environment Variables
Provides links to environment variables used in the OpenMP API.
The Visual C++ implementation of the OpenMP standard includes the following environment variables. These environment variables are read at program startup and modifications to their values are ignored at runtime (for example, using _putenv, _wputenv).
| Environment variable | Description |
|---|---|
| OMP_DYNAMIC | Specifies whether the OpenMP run time can adjust the number of threads in a parallel region. |
| OMP_NESTED | Specifies whether nested parallelism is enabled, unless nested parallelism is enabled or disabled with omp_set_nested. |
| OMP_NUM_THREADS | Sets the maximum number of threads in the parallel region, unless overridden by omp_set_num_threads or num_threads. |
| OMP_SCHEDULE | Modifies the behavior of the schedule clause when schedule(runtime) is specified in a for or parallel for directive. |