Start an optional elapsed-wall-time interval for startup_tock.
Returns a local MPI_Wtime timestamp when profile_startup is enabled,
or zero otherwise. MPI must be initialized when profiling is enabled.
This routine performs no MPI communication or synchronization.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| double precision, | intent(out) | :: | start |
Local start timestamp in seconds, or zero when profiling is disabled. |