GNU libgomp: GOMP_SPINCOUNT

Previous: GOMP_STACKSIZE, Up: Environment Variables [Contents][Index]

### 3.17 `GOMP_SPINCOUNT` – Set the busy-wait spin count

Description:

  Determines how long a threads waits actively with consuming CPU power before waiting passively without consuming CPU power. The value may be either `INFINITE`, `INFINITY` to always wait actively or an integer which gives the number of spins of the busy-wait loop. The integer may optionally be followed by the following suffixes acting as multiplication factors: `k` (kilo, thousand), `M` (mega, million), `G` (giga, billion), or `T` (tera, trillion). If undefined, 0 is used when `OMP_WAIT_POLICY` is `PASSIVE`, 300,000 is used when `OMP_WAIT_POLICY` is undefined and 30 billion is used when `OMP_WAIT_POLICY` is `ACTIVE`. If there are more OpenMP threads than available CPUs, 1000 and 100 spins are used for `OMP_WAIT_POLICY` being `ACTIVE` or undefined, respectively; unless the `GOMP_SPINCOUNT` is lower or `OMP_WAIT_POLICY` is `PASSIVE`.

See also:

  OMP_WAIT_POLICY