3.3 Internal Control Variables

The following internal control variables are defined by the implementation:

• nthreads-var: Controls the number of threads requested for encountered parallel regions. The initial value of nthreads-var is 1.

• dyn-var: Controls whether dynamic adjustment of the number of threads is enabled for encountered parallel regions. The initial value of dyn-var is TRUE (that is, dynamic adjustment is enabled).

• run-sched-var: Controls the schedule that the runtime schedule clause uses for loop regions. The initial value of run-sched-var is static with no chunk size.

• def-sched-var: Controls the implementation defined default scheduling of loop regions. The initial value of def-sched-var is static with no chunk size.

• bind-var: Controls the binding of threads to processors. The initial value of bind-var is FALSE.

• stacksize-var: Controls the stack size for threads that the OpenMP implementation creates. The initial value of stacksize-var is 4 Megabytes for 32-bit applications and 8 Megabytes for 64-bit applications.

• wait-policy-var: Controls the desired behavior of waiting threads. The initial value of wait-policy-var is PASSIVE.

• thread-limit-var: Controls the maximum number of threads participating in the OpenMP program. The initial value of thread-limit-var is 1024.

• max-active-levels-var: Controls the maximum number of nested active parallel regions. The initial value of max-active-levels-var is 4.